Aerosol Generator Having Photonic Heating Means

Abstract

According to one embodiment of the present invention, there is provided an aerosol generating device comprising a heating chamber for receiving an aerosol-forming substrate. The aerosol generating device comprises a heater assembly for heating the aerosol-forming substrate. The heater assembly comprises a photonic device configured for generating a beam of electromagnetic radiation. The aerosol generating device is configured for heating the aerosol-forming substrate by directing the beam of electromagnetic radiation towards the aerosol-forming substrate. The present invention further relates to an aerosol generating system comprising the aerosol generating device and an aerosol-generating article.

Description

[Technical field]

[0001] The present disclosure relates to an aerosol generating device.The present disclosure further relates to an aerosol generating system comprising an aerosol generating device and an aerosol generating article. [Background technology]

[0002] It is known to provide an aerosol generating device for generating an inhalable vapor. Such a device may heat an aerosol-forming substrate contained in the aerosol-generating article without combustion. The aerosol-generating article may have a suitable shape for inserting the aerosol-generating article into a heating chamber of the aerosol-generating device. For example, the aerosol-generating article may have a rod shape. A heating element may be disposed in or around the heating chamber for heating the aerosol-forming substrate after the aerosol-generating article is inserted into the heating chamber of the aerosol-generating device.

[0003] It is known to heat an aerosol-forming substrate by heating a surface that is in thermal contact with the aerosol-forming substrate. Heat from the heated surface is transferred to the aerosol-forming substrate by thermal conduction. This often requires close physical contact between the heated surface and the aerosol-forming substrate. Generally, residues generated from a heated aerosol-forming substrate may accumulate on the heated surface in contact with the substrate.

[0004] It would be desirable to have an aerosol-generating device that can heat an aerosol-forming substrate in a contactless manner. It would be desirable to have an aerosol-generating device that can heat an aerosol-forming substrate without having a heated surface in physical contact with the aerosol-forming substrate. It would be desirable to have an aerosol-generating device that can heat an aerosol-forming substrate with less residue build-up.

[0005] It would be desirable to provide an aerosol generating device that has only a small amount of thermal mass to be heated. It would be desirable to provide an aerosol generating device that can be heated quickly. It would be desirable to provide an aerosol generating device that allows the temperature of the aerosol-forming substrate to respond quickly to changes in the heating protocol.

[0006] It would be desirable to provide an aerosol generating device that has low thermal hysteresis effects. It would be desirable to provide an aerosol generating device that efficiently heats a substrate. It would be desirable to provide an aerosol generating device that allows the temperature of the aerosol-forming substrate to respond quickly to changes in the target temperature.

[0007] According to one embodiment of the present invention, there is provided an aerosol generating device. The aerosol generating device may comprise a heating chamber for receiving an aerosol-forming substrate. The aerosol generating device may comprise a heater assembly for heating the aerosol-forming substrate. The heater assembly may comprise a photonic device configured for generating a beam of electromagnetic radiation. The aerosol generating device may be configured for heating the aerosol-forming substrate by directing the beam of electromagnetic radiation towards the aerosol-forming substrate.

[0008] According to one embodiment of the invention, there is provided an aerosol generating apparatus comprising a heating chamber for receiving an aerosol-forming substrate, the aerosol generating apparatus comprising a heater assembly for heating the aerosol-forming substrate, the heater assembly comprising a photonic device configured for generating a beam of electromagnetic radiation, the aerosol generating apparatus configured for heating the aerosol-forming substrate by directing the beam of electromagnetic radiation towards the aerosol-forming substrate.

[0009] The heating chamber may comprise a first sidewall parallel to a longitudinal axis of the heating chamber. The heating chamber may comprise a second sidewall disposed perpendicular to the first sidewall. The surface of the first sidewall may be greater than the surface of the second sidewall. The aerosol generating device may be configured to heat the aerosol-forming substrate by directing a beam of electromagnetic radiation through at least a portion of the first sidewall of the heating chamber and towards the aerosol-forming substrate.

[0010] An incident beam of electromagnetic radiation may enter the heating chamber, for example, through a transparent portion of the first side wall or through an opening in the first side wall. With the electromagnetic radiation, the temperature of the aerosol-forming substrate may increase up to the temperature of the aerosol-forming substrate required for the aerosol formation process.

[0011] The aerosol-generating device may be configured to heat the aerosol-forming substrate by directing a beam of electromagnetic radiation at or onto the aerosol-forming substrate. The beam of electromagnetic radiation directed at or onto the aerosol-forming substrate may penetrate at least partially into the aerosol-forming substrate.

[0012] As used herein, the terms "surface of a first sidewall" and "surface of a second sidewall" refer to the respective areas (i.e., surface areas) of the sidewalls. The area of ​​the first sidewall exceeds the area of ​​the second sidewall.

[0013] For example, the heating chamber may have the shape of an elongated cylinder that resembles somewhat the shape of a conventional cigarette, in such an embodiment, the first side wall may be a cylindrical side wall of the elongated cylinder, and the second side wall may be one or both of the top and bottom walls of the cylinder.

[0014] For example, the heating chamber may have the shape of a flattened cylinder somewhat resembling the shape of a disk or coin, in such an embodiment, the first side wall may be one or both of the top and bottom walls of the cylinder, and the second side wall may be the cylindrical side wall of the flattened cylinder.

[0015] A large surface area of ​​the aerosol-forming substrate may be advantageously irradiated by irradiating the substrate over a large area through the first sidewall of the heating chamber, which may be particularly advantageous when the photonic device utilises electromagnetic radiation that has a limited penetration depth into the aerosol-forming substrate.

[0016] The aerosol generating device may include an airflow path extending through the heating chamber in a direction parallel to a first side wall of the heating chamber.

[0017] The beam of electromagnetic radiation may be directed through a first sidewall of the heat chamber and the airflow path may extend in a direction parallel to the first sidewall of the heat chamber. The direction of the beam of electromagnetic radiation entering the heat chamber may be substantially perpendicular to the direction of the airflow path within the heat chamber.

[0018] In contrast to conduction or convection, photonic devices transfer energy via electromagnetic waves. By heating the aerosol-forming substrate with a beam of electromagnetic radiation, the aerosol generating device may heat the aerosol-forming substrate in a contactless manner. No or very little physical contact between the aerosol-forming substrate and the heated surface of the heat conducting element is required to heat the aerosol-forming substrate. Omitting or reducing the heated surface of the heat conducting element may reduce the overall thermal mass to be heated. This may allow for fast and efficient heating.

[0019] Having no, or very little, physical contact between the aerosol-forming substrate and the surface to be heated may also reduce residue build-up during use.

[0020] A low thermal mass may be beneficial for an aerosol-generating device to heat the aerosol-forming substrate to a desired temperature more quickly. A low thermal mass may be beneficial for an aerosol-generating device to have fewer thermal hysteresis effects. A low thermal mass may be beneficial for an aerosol-generating device to heat the substrate more efficiently.

[0021] The photonic device may have a shorter on / off response time compared to other heaters, such as resistive heaters. The short response time of the photonic device may be beneficial for the aerosol generating device to heat the aerosol-forming substrate to a desired temperature more quickly. The short response time of the photonic device may be beneficial for the aerosol generating device to have less thermal hysteresis effects. The short response time of the photonic device may be beneficial for the aerosol generating device to heat the substrate more efficiently. For example, the heating may be quickly turned off and back on depending on whether a puff is detected by the puff sensor of the aerosol generating device. The shorter response time may allow for more precise dynamic thermal control when varying the power supply over time. For example, the temperature of the aerosol-forming substrate may be quickly raised to a desired temperature by increasing the power supplied when the temperature drops below a predetermined threshold.

[0022] The photonic device may comprise a light source. The photonic device may comprise one or more of a semiconductor based electronics, a laser, a light emitting diode, a laser diode, an IR emitter. The photonic device may comprise an IR laser diode. The photonic device may comprise a plurality of light sources. The photonic device may comprise 2, 3, 4, 5, 6, 7, 8, 9, or 10 light sources. The photonic device may comprise 2, 3, 4, 5, 6, 7, 8, 9, or 10 IR laser diodes.

[0023] As used herein, "IR" refers to infrared light. Generally, infrared light can be electromagnetic radiation within a wavelength range of about 780 nanometers to about 15 micrometers (or even up to about 1000 micrometers).

[0024] The photonic device may be configured to emit electromagnetic radiation at a wavelength in the range of 800 nanometers to 2500 nanometers. The photonic device may be configured to emit electromagnetic radiation at a wavelength in the range of 1100 nanometers to 2000 nanometers. The photonic device may be configured to emit electromagnetic radiation at a wavelength in the range of 1400 nanometers to 1700 nanometers. The photonic device may be configured to emit electromagnetic radiation at a wavelength of about 1550 nanometers.

[0025] Different materials absorb IR radiation at different frequencies. Careful selection of wavelengths can facilitate certain substances to be efficiently heated while other substances remain at substantially lower temperatures. As a result, the photonic device of the present invention may allow targeted heating depending on one or more components of the aerosol-forming substrate. Targeted IR radiation does not necessarily heat the surrounding air. This means that more efficient heating can be achieved. Also, there is more design freedom since air gaps may reduce thermal losses. Therefore, potentially less insulating material may be required.

[0026] Another advantage of IR heating means may be that the thermal response is fast: the aerosol-forming substrate may be substantially heated only during the time of irradiation.

[0027] The photonic device may act as an IR emitter. To select a suitable IR emitter, the composition of the aerosol-forming substrate should be considered. The IR emitter may be selected in terms of one or more IR emitter characteristics. The one or more IR emitter characteristics may be selected depending on one or more components of the aerosol-forming substrate. For example, the one or more IR emitter characteristics may include any one or combination of wavelength, frequency, spot size, swept source, pulsed vs. continuous wave, energy, power. For example, the wavelength of the IR emitter may be selected in terms of absorption of IR light by one or more components of the aerosol-forming substrate. The wavelength of the IR emitter may be selected in terms of transmission of IR light by one or more components of the aerosol-forming substrate.

[0028] The wavelength of the IR emitter may correspond to an IR absorption band of a component of the aerosol-forming substrate.The wavelength of the IR emitter may correspond to an IR absorption band of two or more components of the aerosol-forming substrate.

[0029] For example, the wavelength of the IR emitter may correspond to one or more IR absorption bands of glycerol, molasses, sugar, invert sugar, tobacco, tobacco derivatives, or any other component of the aerosol-forming substrate, as described below.

[0030] The term "wavelength" may refer to a single wavelength, multiple single wavelengths, a range of wavelengths, multiple ranges of wavelengths, or any combination thereof.

[0031] For example, a relatively large amount of glycerol may be present in the aerosol-forming substrate, and the wavelength requirement may be adapted to the strong absorption band of glycerol, which is found at wavelengths of IR light between 1300 nanometers and 2000 nanometers. As a result, the IR emitter may emit IR light within the range of 800 nanometers to 2300 nanometers, preferably 1300 nanometers to 2000 nanometers.

[0032] The IR emitter may be adapted to the IR absorption band of any of the components of the aerosol-forming substrate.The IR emitter may be adapted to the IR transmission of any of the components of the aerosol-forming substrate.

[0033] Control over the intensity of heating of the aerosol-forming substrate by the IR emitter may be achieved by moving the wavelength of heating slightly off-resonance from an already selected wavelength. This may advantageously maximize the absorption of the desired compound, e.g., glycerol, in the aerosol-forming substrate. In some embodiments, control over the intensity of heating of the aerosol-forming substrate may be achieved by varying the power supplied to the IR emitter.

[0034] The photonic device may be configured to irradiate a surface area of ​​the aerosol-forming substrate of between 0.1 square centimeters and 10 square centimeters. The photonic device may be configured to irradiate a surface area of ​​the aerosol-forming substrate of between 0.2 square centimeters and 4.1 square centimeters. The photonic device may be configured to irradiate a surface area of ​​the aerosol-forming substrate of about 2 square centimeters.

[0035] The power of the beam of electromagnetic radiation may be in the range of 0.1 Watts to 30 Watts. The power of the beam of electromagnetic radiation may be in the range of 0.5 Watts to 25 Watts. The power of the beam of electromagnetic radiation may be in the range of 2 Watts to 6 Watts. The power of the beam of electromagnetic radiation may be approximately 4 Watts.

[0036] The energy density of the beam of electromagnetic radiation may be in the range of 0.5 watts per square centimeter to 100 watts per square centimeter. The energy density of the beam of electromagnetic radiation may be in the range of 1 watt per square centimeter to 20 watts per square centimeter. The energy density of the beam of electromagnetic radiation may be in the range of 2 watts per square centimeter to 6 watts per square centimeter.

[0037] The aerosol-generating apparatus may be configured such that the distance along the optical path between the photonic device and the surface of the aerosol-forming substrate is between 0.1 centimeters and 50 centimeters.The aerosol-generating apparatus may be configured such that the distance along the optical path between the photonic device and the surface of the aerosol-forming substrate is between 2 centimeters and 30 centimeters.

[0038] The aerosol generating device may include a cooling system for cooling the photonic device. The cooling system may include an airflow path extending from the air inlet, past the photonic device, to the heating chamber. The photonic device may be cooled by outside air entering the device via the air inlet and passing through the photonic device. Heat generated by the photonic device may be used to pre-heat the air passing through the photonic device before entering the heating chamber. Thereby, the energy efficiency of the aerosol generating device may be additionally improved. The cooling system may utilize passive cooling, or active cooling, or both. The cooling system may include a conduit of thermally conductive material. The cooling system may ensure that the photonic device is kept at a safe operating temperature, thereby avoiding damage.

[0039] The aerosol generating device may comprise a safety interlock switch. The safety interlock switch may be configured to allow activation of the photonic device only under certain circumstances, for example only when the aerosol-forming substrate is inserted into the heating chamber or only when the lid of the heating chamber is tightly closed. The safety interlock switch may ensure that leakage of electromagnetic radiation, for example IR light, is avoided. The safety interlock switch may help to keep the user safe. The safety interlock switch may be based on a non-contact principle, such as a magnetic safety interlock switch. The safety interlock switch may be based on an electrical circuit.

[0040] The photonic device of the present invention may be used as the sole heating means for heating the aerosol-forming substrate. In some embodiments, the photonic device of the present invention may be used in combination with one or more additional heating means. Any heating means may be used as the additional heating means. Examples include electrical heating means, such as resistive heating means, or inductive heating means, or a combination of both resistive and inductive heating means.

[0041] The aerosol generating device may comprise control electronics. The control electronics may comprise a controller. The control electronics may comprise a memory. The memory may contain instructions that cause one or more components of the aerosol generating device to perform functions or aspects of the control electronics. Functions attributed to the control electronics in this disclosure may be embodied as one or more of software, firmware, and hardware. The memory may be a non-transitory computer readable storage medium.

[0042] Specifically, one or more of the components described herein (such as the controller) may comprise a processor, such as a central processing unit (CPU), computer, logic array, or other device capable of directing data into or out of the control electronics. The controller may comprise one or more computing devices having memory, processing means, and communication hardware. The controller may comprise circuitry used to couple the various components of the controller together or with other components operatively coupled to the controller. The functions of the controller may be implemented by hardware. The functions of the controller may be implemented by instructions stored on a non-transitory computer-readable storage medium. The functions of the controller may be implemented by both hardware and instructions stored on a non-transitory computer-readable storage medium.

[0043] Where a controller comprises a processor, the processor may in some embodiments comprise any one or more of a microprocessor, a microcontroller, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), equivalent discrete or integrated logic circuitry. In some embodiments, a processor may comprise multiple components, such as one or more microprocessors, one or more controllers, one or more DSPs, one or more ASICs, one or more FPGAs, as well as any combination of other discrete or integrated logic circuitry. The functionality attributed to a controller or processor herein may be embodied as software, firmware, hardware, or any combination thereof. Alternative controllers, while described herein as processor-based systems, may utilize other components, such as relays and timers, alone or in combination with a microprocessor-based system, to achieve the desired results.

[0044] In one or more embodiments, the exemplary systems, methods, and interfaces may be implemented using one or more computer programs using a computing facility, which may include one or more processors, or memory, or both memory and one or more processors. The program code, or logic, or both code and logic described herein may be applied to input data or information to perform the functionality described herein and generate desired output data / information. The output data or information may be applied as input to one or more other devices or methods, as described herein or as would be applied in a known manner. In view of the above, it will be readily apparent that the controller functionality as described herein may be implemented in any manner known to one of ordinary skill in the art.

[0045] In some embodiments, the control electronics may include a microprocessor, which may be a programmable microprocessor. The electronic circuitry may be configured to regulate the supply of electrical power. The electrical power may be supplied to the photonic device in the form of current pulses.

[0046] The aerosol generating device may comprise a temperature sensor. The temperature sensor may comprise a thermocouple. The temperature sensor may be operatively coupled to the control electronics to control the temperature of the heating element. The temperature sensor may be located in any suitable location. For example, the temperature sensor may be configured to monitor the temperature of the aerosol-forming substrate being heated. Additionally or alternatively, the temperature sensor may be configured to monitor the temperature of the photonic device. The sensor may send a signal regarding the sensed temperature to the control electronics, which may adjust the power of the photonic device to achieve the appropriate temperature at the sensor.

[0047] The photonic device may generate an aerosol by heating the aerosol-forming substrate with electromagnetic waves. In some embodiments, the aerosol-forming substrate is preferably heated to a temperature within a range of about 150°C to about 400°C.

[0048] In some embodiments, the aerosol-forming substrate is heated to a temperature within the range of about 150°C to about 250°C, preferably about 180°C to about 230°C, and more preferably about 200°C to about 230°C. In some embodiments, the aerosol-forming substrate is a liquid aerosol-forming substrate, and is heated to a temperature within the range of about 150°C to about 250°C, preferably about 180°C to about 230°C, and more preferably about 200°C to about 230°C. In some embodiments, the aerosol-forming substrate is a solid aerosol-forming substrate, and is heated to a temperature within the range of about 150°C to about 250°C, preferably about 180°C to about 230°C, and more preferably about 200°C to about 230°C. In some embodiments, the aerosol-forming substrate is a solid aerosol-forming substrate containing a tobacco material, and is heated to a temperature within the range of about 150°C to about 250°C, preferably about 180°C to about 230°C, and more preferably about 200°C to about 230°C.

[0049] In some embodiments, the aerosol-forming substrate is heated to a temperature in the range of about 230° C. to about 400° C., preferably about 250° C. to about 350° C. In some embodiments, the aerosol-forming substrate is a solid aerosol-forming substrate, and is heated to a temperature in the range of about 230° C. to about 400° C., preferably about 250° C. to about 350° C. In some embodiments, the aerosol-forming substrate is a solid aerosol-forming substrate comprising a tobacco material, and is heated to a temperature in the range of about 230° C. to about 400° C., preferably about 250° C. to about 350° C.

[0050] The aerosol generating device may be a handheld device.

[0051] The aerosol generating device may be a non-combustion type device, which heats the aerosol-forming substrate without burning it, and which heats the aerosol-forming substrate to a temperature below its combustion temperature.

[0052] The heating chamber may be disposed between the photonic device and the oral end of the aerosol generation device, relative to a longitudinal axis of the aerosol generation device.

[0053] The aerosol generating device may include a reclosable lid for insertion of the aerosol-forming substrate into the heating chamber.

[0054] The reclosable lid may be located on a sidewall of the aerosol generation device between a proximal end of the heating chamber and a distal end of the heating chamber relative to a longitudinal axis of the aerosol generation device. The reclosable lid may be located on a sidewall of the heating chamber. The reclosable lid may be located on a first sidewall of the heating chamber. The reclosable lid may be located on a second sidewall of the heating chamber.

[0055] The reclosable lid may comprise a hinged door or a sliding door.

[0056] At least a portion of a wall of the heating chamber may comprise a window. At least a portion of a first side wall of the heating chamber may comprise a window. The window may be substantially transparent to the beam of electromagnetic radiation emitted by the photonic device. The window may be located at a distal end of the heating chamber relative to a longitudinal axis of the heating chamber. The window may be located at a distal end of the heating chamber relative to a longitudinal axis of the heating chamber. The window may be located at a proximal end of the heating chamber relative to a longitudinal axis of the heating chamber. The window may be located between the distal end of the heating chamber and the proximal end of the heating chamber relative to a longitudinal axis of the aerosol generation device.

[0057] The window may comprise one or more of fused silica, lithium fluoride, magnesium fluoride, calcium fluoride, barium fluoride, silicon, germanium, copper, zinc selenide, and sapphire. Fused silica may be preferred because it is corrosion resistant and does not corrode easily upon contact with ambient air.

[0058] At least a portion of a wall of the heating chamber may comprise an IR blocking material, which may be located at a proximal end of the heating chamber relative to a longitudinal axis of the aerosol generating device.

[0059] The aerosol generating apparatus may comprise beam guiding means for directing the beam of electromagnetic radiation emitted by the photonic device towards the aerosol-forming substrate. The beam guiding means may be configured to manipulate the direction of the beam of electromagnetic radiation. The aerosol generating apparatus may comprise beam guiding means for directing the beam of electromagnetic radiation towards a first side wall of the heating chamber.

[0060] The beam guiding means may comprise a reflective surface arranged to deflect an incident beam of electromagnetic radiation towards the heating chamber.The beam guiding means may comprise an IR reflective material.

[0061] The reflective surface may be disposed on a slanted wall of the aerosol generating device. The slanted wall may be slanted at an angle less than 90 degrees with respect to a longitudinal axis of the aerosol generating device. The slanted wall may be disposed coaxially about a first side wall of the heating chamber. The slanted wall may be disposed coaxially about a first side wall of the heating chamber, and the first side wall of the heating chamber may comprise an IR transparent material.

[0062] One or both of the inside walls of the heating chamber and the inside walls of the aerosol generating device may include or be coated with an IR reflective material.

[0063] The IR reflective material may include a metal, preferably aluminum, gold, silver, or any combination or alloy thereof.

[0064] The aerosol generating device may include a protective coating over the IR reflective material. The protective coating may include SiO2 or SiO.

[0065] The walls of the aerosol generating device including an IR reflective material on the inside may be disposed coaxially around the sidewall of the heating chamber. The sidewall of the heating chamber coaxially surrounded by the IR reflective material may include an IR transparent material.

[0066] The walls of the aerosol generating device that include an IR reflective material may be inclined at an angle of less than 90 degrees to the longitudinal axis of the aerosol generating device. The inclined walls may act as beam guiding means. The inclined walls may be straight or curved.

[0067] The angled wall of the aerosol generating device may be disposed coaxially around a side wall of the heating chamber. The side wall of the heating chamber coaxially surrounded by the angled wall may comprise an IR transparent material.

[0068] The present invention further relates to an aerosol-generating system comprising an aerosol-generating device as described herein and an aerosol-generating article comprising an aerosol-forming substrate. The aerosol-generating article may be configured to be at least partially inserted into a heating chamber. The aerosol-generating article may comprise or consist of the aerosol-forming substrate.

[0069] The aerosol-forming substrate may comprise a cast leaf.

[0070] The aerosol-forming substrate may have the shape of a disk or sheet, thereby achieving a large surface area relative to its volume. The limited penetration depth of IR radiation may result in superficial heating of the substrate. Therefore, the substrate ideally has a large surface area relative to its volume.

[0071] The aerosol-forming substrate may have a diameter of from 5 millimeters to 15 millimeters, preferably about 15 millimeters. The aerosol-forming substrate may have a thickness of from 1 millimeter to 10 millimeters, preferably about 5 millimeters.

[0072] The aerosol-forming substrate may have a mass of from 100 milligrams to 1 gram, preferably about 400 milligrams.

[0073] The invention further relates to a method of forming an aerosol in an aerosol-generating device, the method comprising generating a beam of electromagnetic radiation by a photonic device, the method comprising directing the beam of electromagnetic radiation from the photonic device towards an aerosol-forming substrate, the method comprising heating the aerosol-forming substrate by the beam of electromagnetic radiation to generate an aerosol.

[0074] The beam of electromagnetic radiation generated by the photonic device may be a beam of IR light. The temperature of the aerosol-forming substrate may increase upon absorption of the IR light. The temperature of the aerosol-forming substrate may increase upon absorption of the IR light until it reaches a vaporization temperature at which an aerosol may be formed.

[0075] In one or more embodiments of the method, the wavelength of the beam of IR radiation may be selected to correspond to a wavelength at which at least one component of the aerosol-forming substrate absorbs IR radiation.

[0076] The term "aerosol-forming substrate" as used herein refers to a substrate capable of releasing a volatile compound capable of forming an aerosol. The volatile compound may be released by heating or burning the aerosol-forming substrate. As an alternative to heating or burning, in some cases the volatile compound may be released by a chemical reaction or by mechanical stimulation such as ultrasound. The aerosol-forming substrate may be solid or liquid, or may include both solid and liquid components. The aerosol-forming substrate may be part of an aerosol-generating article.

[0077] The aerosol-forming substrate preferably comprises a plant material and an aerosol former, the plant material preferably being an alkaloid-containing plant material, more preferably being a nicotine-containing plant material, more preferably being a tobacco-containing material.

[0078] Preferably, the aerosol-forming substrate comprises at least 70 percent by weight plant material on a dry weight basis, more preferably at least 90 percent by weight plant material.Preferably, the aerosol-forming substrate comprises less than 95 percent by weight plant material on a dry weight basis, such as 90-95 percent by weight plant material on a dry weight basis.

[0079] Preferably, the aerosol-forming substrate comprises at least 5 weight percent aerosol formers on a dry weight basis, more preferably at least 10 weight percent aerosol formers.Preferably, the aerosol-forming substrate comprises less than 30 weight percent aerosol formers on a dry weight basis, such as from 5 to 30 weight percent aerosol formers on a dry weight basis.

[0080] In some particularly preferred embodiments, the aerosol-forming substrate comprises a plant material and an aerosol former, the substrate having an aerosol former content of 5-30% by weight on a dry weight basis. The plant material is preferably an alkaloid-containing plant material, more preferably a nicotine-containing plant material, more preferably a tobacco-containing material. Alkaloids are a class of naturally occurring nitrogen-containing organic compounds. Alkaloids are found primarily in plants, but also in bacteria, fungi, and animals. Examples of alkaloids include, but are not limited to, caffeine, nicotine, theobromine, atropine, and tubocurarine. A preferred alkaloid is nicotine, which may be found in tobacco.

[0081] The aerosol-forming substrate may comprise nicotine. The aerosol-forming substrate may comprise tobacco, for example a tobacco-containing material containing volatile tobacco flavor compounds that are released from the aerosol-forming substrate upon heating. In a preferred embodiment, the aerosol-forming substrate may comprise homogenized tobacco material, for example cast leaf tobacco. The aerosol-forming substrate may comprise both solid and liquid components. The aerosol-forming substrate may comprise a tobacco-containing material containing volatile tobacco flavor compounds that are released from the substrate upon heating. The aerosol-forming substrate may comprise a non-tobacco material. The aerosol-forming substrate may further comprise an aerosol former. Examples of suitable aerosol formers are glycerin and propylene glycol.

[0082] The term "cast leaf" is used herein to refer to a sheet product made by a casting process based on casting a slurry containing plant particles (e.g., clove particles, or tobacco particles and clove particles in a mixture) and a binder (e.g., guar gum) onto a support surface (such as a belt conveyor), drying the slurry, and removing the dried sheet from the support surface. An example of a casting or cast leaf process is described, for example, in US Pat. No. A-5,724,998 for the production of cast leaf tobacco. In the cast leaf process, particulate plant material is mixed with a liquid component (typically water) to form a slurry. Other added components in the slurry may include fibers, binders, aerosol formers. The particulate plant material may be agglomerated in the presence of a binder. The slurry is cast onto a support surface and dried to form a sheet of homogenized plant material.

[0083] As used herein, the term "aerosol-generating article" refers to an article that includes an aerosol-forming substrate capable of emitting a volatile compound capable of forming an aerosol. The aerosol-generating article may be disposable.

[0084] The term "aerosol-generating device" as used herein refers to a device that interacts with an aerosol-forming substrate to generate an aerosol. The aerosol-generating device may interact with one or both of an aerosol-generating article that includes an aerosol-forming substrate and a cartridge that includes an aerosol-forming substrate. In some examples, the aerosol-generating device may heat the aerosol-forming substrate to facilitate the release of volatile compounds from the substrate. An electrically operated aerosol-generating device may include an atomizer, such as an electric heater, for heating the aerosol-forming substrate to form an aerosol.

[0085] The term "aerosol-generating system" as used herein refers to the combination of an aerosol-generating device with an aerosol-forming substrate. When the aerosol-forming substrate forms part of an aerosol-generating article, the aerosol-generating system refers to the combination of an aerosol-generating device with an aerosol-generating article. In an aerosol-generating system, the aerosol-forming substrate and the aerosol-generating device work together to generate an aerosol.

[0086] As used herein, the term "longitudinal" is used to describe a direction along the major axis of the aerosol-generating device or of the heating chamber, and the term "transverse" is used to describe a direction perpendicular to the longitudinal direction. The term "longitudinal axis of the aerosol-generating device" refers to the axis of the aerosol-generating device that corresponds to the direction of maximum expansion of the aerosol-generating device. The term "longitudinal axis of the heating chamber" refers to the axis of the heating chamber that corresponds to the direction of maximum expansion of the heating chamber.

[0087] In certain embodiments, the longitudinal axis of the heating chamber is parallel to the longitudinal axis of the aerosol generating device. For example, the open end of the chamber is located at the proximal end of the aerosol generating device. In other embodiments, the longitudinal axis of the heating chamber is at an angle to the longitudinal axis of the aerosol generating device, for example perpendicular to the longitudinal axis of the aerosol generating device. For example, the open end of the heating chamber is located along one side of the aerosol generating device, whereby the aerosol-generating article may be inserted into the heating chamber in a direction perpendicular to the longitudinal axis of the aerosol generating device.

[0088] As used herein, the term "proximal" refers to the user end (also the mouth end of the aerosol generating device) and the term "distal" refers to the end opposite the proximal end. When referring to the heating chamber or inductor coil, the term "proximal" refers to the area closest to the open end of the heating chamber and the term "distal" refers to the area closest to the closed end. The ends of the aerosol generating device or heating chamber may also be referred to with respect to the direction of air flow through the aerosol generating device. The proximal end may be referred to as the "downstream end" and the distal end may be referred to as the "upstream end."

[0089] The term "length" as used herein refers to the major dimension along the longitudinal axis of a heating chamber, the longitudinal axis of an aerosol-generating device, the longitudinal axis of an aerosol-generating article, or the longitudinal axis of a component of an aerosol-generating device or article.

[0090] As used herein, the term "width" refers to the major dimension across a heating chamber, across an aerosol-generating device, across an aerosol-generating article, or across a component of an aerosol-generating device or article at a particular location along its length. The term "thickness" refers to the dimension in the transverse direction perpendicular to the width.

[0091] The following provides a non-exhaustive list of non-limiting examples, any one or more of the features of which may be combined with any one or more features of the other examples, embodiments, or aspects described herein.

[0092] Example A: An aerosol generating device comprising: a heating chamber for receiving an aerosol-forming substrate; a heater assembly for heating the aerosol-forming substrate; the heater assembly comprising a photonic device configured to generate a beam of electromagnetic radiation; An aerosol-generating device, the aerosol-generating device being configured to heat an aerosol-forming substrate by directing a beam of electromagnetic radiation towards the aerosol-forming substrate. Example B: A heating chamber comprising a first sidewall parallel to a longitudinal axis of the heating chamber and a second sidewall disposed perpendicular to the first sidewall; a surface area of ​​the first side wall is greater than a surface area of ​​the second side wall; The aerosol generating apparatus of Example A, wherein the aerosol generating apparatus is configured to heat the aerosol-forming substrate by directing a beam of electromagnetic radiation through at least a portion of the first side wall of the heating chamber and toward the aerosol-forming substrate. Example C: An aerosol generating device as described in example B, comprising a beam guiding means for directing the beam of electromagnetic radiation towards the first side wall of the heating chamber. Example D: An aerosol generating device as described in example C, wherein the beam guiding means comprises a reflective surface arranged to deflect the incident beam of electromagnetic radiation towards the heating chamber. Example E: An aerosol generating device as described in Example D, wherein the reflective surface is disposed on a slanted wall of the aerosol generating device, the slanted wall being slanted at an angle less than 90 degrees with respect to the longitudinal axis of the aerosol generating device, and preferably the slanted wall is disposed coaxially around the first side wall of the heating chamber, and the first side wall of the heating chamber comprises an IR-transparent material. Example F: An aerosol generating apparatus according to any of Examples C to E, wherein the beam guiding means comprises an IR reflective material. Example G: An aerosol generating device according to any of Examples B-F, comprising an airflow path extending through the heating chamber in a direction parallel to the first sidewall of the heating chamber. Example H: An aerosol generator according to any of Examples A to G, wherein the photonic device comprises a light source. Example I: An aerosol generating apparatus according to any of Examples A-H, wherein the photonic device comprises one or more of a semiconductor-based electronic device, a light emitting diode, a laser diode, and an IR emitter. Example J: An aerosol generating apparatus according to any one of Examples A to I, wherein the photonic device comprises an IR laser diode. Example K: An aerosol generating apparatus according to any of Examples A to J, wherein the photonic device is configured to emit electromagnetic radiation having a wavelength in the range of 800 nanometers to 2500 nanometers, preferably 1100 nanometers to 2000 nanometers, more preferably 1400 nanometers to 1700 nanometers, and most preferably around 1550 nanometers. Example L: An aerosol generating apparatus according to any of Examples A to K, wherein the photonic device is configured to irradiate a surface area of ​​the aerosol-forming substrate of between 0.1 square centimeters and 10 square centimeters, preferably between 0.2 square centimeters and 4.1 square centimeters, more preferably about 2 square centimeters. Example M: ​​An aerosol generating apparatus according to any of Examples A to L, wherein the power of the beam of electromagnetic radiation is in the range of 0.1 Watts to 30 Watts, preferably 0.5 Watts to 25 Watts, more preferably 2 Watts to 6 Watts, and most preferably 4 Watts. Example N: An aerosol generating apparatus according to any of Examples A to M, wherein the energy density of the beam of electromagnetic radiation is in the range of 0.5 Watts per square centimeter to 100 Watts per square centimeter, preferably 1 Watt per square centimeter to 20 Watts per square centimeter, more preferably 2 Watts per square centimeter to 6 Watts per square centimeter. Example O: An aerosol generating apparatus according to any of Examples A to N, wherein the aerosol generating apparatus is configured such that the distance along the optical path between the photonic device and the surface of the aerosol-forming substrate is between 0.1 centimeters and 50 centimeters, preferably between 2 centimeters and 30 centimeters. Example P: An aerosol generating apparatus as described in any of Examples A to O, comprising a cooling system for cooling the photonic device, the cooling system comprising an airflow path extending from the air inlet, past the photonic device, and into the heating chamber. Example Q: An aerosol generating device according to any one of Examples A to P, comprising a safety interlock switch. Example R: An aerosol generator according to any of Examples A-Q, wherein the heating chamber is disposed between the photonic device and the mouth end of the aerosol generator, relative to the longitudinal axis of the aerosol generator. Example S: An aerosol generating device according to any of Examples A-R, comprising a reclosable lid for insertion of an aerosol-forming substrate into the heating chamber. Example T: An aerosol generating device as described in example S, wherein the reclosable lid is located on a side wall of the aerosol generating device between the proximal end of the heating chamber and the distal end of the heating chamber relative to the longitudinal axis of the aerosol generating device. Example U: The aerosol generating device of example S or example T, wherein the reclosable lid comprises a hinged door or a sliding door. Example V: An aerosol generating apparatus described in any of Examples B to U, preferably wherein at least a portion of the first side wall of the heating chamber has a window that is substantially transparent to the beam of electromagnetic radiation emitted by the photonic device, the window being located at a distal end of the heating chamber. Example W: The aerosol generating device of example V, wherein the window comprises one or more of fused silica, lithium fluoride, magnesium fluoride, calcium fluoride, barium fluoride, silicon, germanium, copper, zinc selenide, and sapphire. Example X: An aerosol generating device as described in any of Examples A to W, wherein preferably at least a portion of the wall of the heating chamber comprises an IR blocking material, the IR blocking material being located at a proximal end of the heating chamber relative to the longitudinal axis of the aerosol generating device. Example Y: An aerosol generating device described in any of Examples A to X, wherein one or both of the inside of the heating chamber wall and the inside of the aerosol generating device wall contain or are coated with an IR reflective material. Example Z: The aerosol generating device of example Y, wherein the IR reflective material comprises a metal, preferably aluminum, gold, silver, or any combination or alloy thereof. Example ZA: An aerosol generating device according to Example Y or Example Z, comprising a protective coating over the IR reflective material, preferably the protective coating comprises SiO2 or SiO. Example ZB: An aerosol generating device according to any of Examples Y-ZA, wherein the wall of the aerosol generating device comprising the IR reflective material is inclined at an angle of less than 90 degrees relative to the longitudinal axis of the aerosol generating device. Embodiment ZC: The aerosol generator of embodiment ZB, preferably wherein the sloped wall of the aerosol generator is disposed coaxially around the side wall of the heating chamber, and wherein the side wall of the heating chamber comprises an IR transparent material. Example ZD: The aerosol generating device of any one of Examples A to ZC, wherein the aerosol generating device is a handheld device. Example ZE: An aerosol-generating device according to any one of Examples A to ZD, wherein the aerosol-generating device is a heating non-combustion type device. Example ZF: An aerosol generating system comprising an aerosol generating device as described in any of Examples A-ZE and an aerosol-generating article including an aerosol-forming substrate, the aerosol-generating article configured to be at least partially inserted into a heating chamber. Example ZG: The aerosol-generating system of Example ZF, wherein the aerosol-forming substrate comprises a cast leaf. Example ZH: An aerosol-generating system as described in Example ZF or Example ZG, wherein the aerosol-forming substrate has the shape of a disc or sheet. Example ZI: An aerosol-generating system as described in example ZH, wherein the aerosol-forming substrate has a diameter of 5 millimeters to 15 millimeters, preferably about 15 millimeters, and wherein the aerosol-forming substrate has a thickness of 1 millimeter to 10 millimeters, preferably about 5 millimeters. Example ZJ: An aerosol-generating system according to any of Examples ZF to ZI, wherein the aerosol-forming substrate has a mass between 100 milligrams and 1 gram, preferably about 400 milligrams. Example ZK: A method for forming an aerosol in an aerosol generating device, comprising: generating a beam of electromagnetic radiation with a photonic device; directing a beam of electromagnetic radiation from a photonic device towards an aerosol-forming substrate; heating the aerosol-forming substrate with a beam of electromagnetic radiation to generate an aerosol.

[0093] Features described with respect to one embodiment may be equally applied to other embodiments of the invention.

[0094] The invention will now be further described, by way of example only, with reference to the accompanying drawings in which: [Brief description of the drawings]

[0095] [Figure 1a] FIG. 1a shows an aerosol generating device. [Figure 1b] FIG. 1b shows an aerosol generating device. [Figure 2a] FIG. 2a shows an aerosol generating device. [Figure 2b] FIG. 2b shows an aerosol generating device. [Figure 2c] FIG. 2c shows an aerosol generating device. [Figure 3a] FIG. 3a shows an aerosol generating device. [Figure 3b] FIG. 3b shows an aerosol generating device. [Figure 3c] FIG. 3c shows an aerosol generating device. [Figure 4a] FIG. 4a shows the heating chamber of the aerosol generating device. [Figure 4b] FIG. 4b shows the heating chamber of the aerosol generating device. [Figure 4c] FIG. 4c shows the heating chamber of the aerosol generating device. [Figure 4d] FIG. 4d shows the heating chamber of the aerosol generating device. [Figure 4e] FIG. 4e shows the heating chamber of the aerosol generating device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0096] Figures 1a and 1b show cross-sectional side views of an aerosol generating device, which is shown with the mouth end of the device on the left side of the figure.

[0097] As shown in Figure 1a, the aerosol-generating apparatus of Figures 1a and 1b comprises a heating chamber 10 for receiving an aerosol-forming substrate. The aerosol-generating apparatus comprises a heater assembly for heating the aerosol-forming substrate. The heater assembly comprises a photonic device 12 configured for generating a beam of electromagnetic radiation. The aerosol-generating apparatus is configured for heating the aerosol-forming substrate by directing the beam of electromagnetic radiation towards the aerosol-forming substrate when the aerosol-forming substrate is inserted into the heating chamber 10.

[0098] The aerosol generating apparatus further comprises a cooling system 14 for cooling the photonic device 12. The aerosol generating apparatus comprises a control unit 16 for controlling the operation of the apparatus. The aerosol generating apparatus comprises a power supply 18 for providing power to the apparatus.

[0099] The aerosol generating device further comprises air inlets 20, 22. The air inlets 20, 22 are formed as openings in a housing 24 of the aerosol generating device.

[0100] Arrows 26 in FIG. 1b illustrate the airflow paths in the aerosol-generating device of FIG. 1a and FIG. 1b. Ambient air enters the aerosol-generating device via air inlet 20 and then enters the heating chamber 10 via air inlet 22. In use, an aerosol-forming substrate is inserted into the heating chamber and air may flow through or past the aerosol-forming substrate. Eventually, the air containing the aerosol generated by the aerosol-forming substrate exits the heating chamber 10 at the mouth end of the aerosol-generating device, i.e., the left side of FIG. 1a and FIG. 1b. The aerosol-forming substrate may be part of an aerosol-generating article. The aerosol-forming substrate may be part of a distal portion of the aerosol-generating article. The distal portion of the article may be inserted into the heating chamber 10. The aerosol-generating article may comprise a mouthpiece, such as a mouthpiece filter element, at its proximal end. In use, a user may suck directly on the mouthpiece of the aerosol-generating article.

[0101] Figures 2a-c show cross-sections of an aerosol generating device in side view, with the mouth end of the device shown to the left of the figure.

[0102] As shown in Fig. 2a, the aerosol generating device of Fig. 2a-c comprises a heating chamber 10 for receiving an aerosol-forming substrate and a heater assembly for heating the aerosol-forming substrate. As shown in Fig. 2b, the heating chamber 10 comprises a first sidewall 10a parallel to a longitudinal axis of the heating chamber 10. The heating chamber 10 comprises a second sidewall 10b disposed perpendicular to the first sidewall 10a. The surface of the first sidewall 10a is larger than the surface of the second sidewall 10b.

[0103] As shown in Figure 2a, the heater assembly comprises a photonic device 12. The photonic device 12 is disposed transversely between the heating chamber 10 and an outer wall of the housing 24. The photonic device 12 may comprise a ring-shaped light source with the ring surrounding the central longitudinal axis of the aerosol generating device. Alternatively, the photonic device 12 may comprise one or more light sources disposed circumferentially around the heating chamber in the transverse plane of the aerosol generating device.

[0104] The photonic device 12 comprises an IR emitter, such as an IR laser diode, configured to generate an IR beam, and the aerosol generator is configured to heat the aerosol-forming substrate by directing the IR beam through the first sidewall 12a of the heating chamber 10 and toward the aerosol-forming substrate when the aerosol-forming substrate is inserted into the heating chamber 10.

[0105] The aerosol generating device comprises a cooling system 14, a control unit 16, a power supply 18, and a device housing 24. The aerosol generating device further comprises air inlets 20, 22. Arrows 26 in Figure 2b illustrate the airflow path in the aerosol generating device of Figures 2a-2c. The air inlet 20 is positioned close to the cooling system 14. This may further enhance cooling capabilities through air convection.

[0106] 2a, a first sidewall 10a of the heating chamber comprises an IR-transmitting material 28, such as fused silica. The inside wall of the housing 24 that coaxially surrounds the heating chamber 10 comprises an IR-reflective material 30, such as aluminum.

[0107] Arrows 32 in FIG. 2c illustrate the propagation of the IR beam when the photonic device 12 is activated. The beam of IR light 32 exits the photonic device 12. Depending on the direction of the beam, the beam 32 may enter the heating chamber 10 directly through the IR transparent material 28, or may first be reflected off the IR reflecting material 30 before entering the heating chamber 10 through the IR transparent material 28. The IR reflecting material 30 therefore functions as a beam guiding means. An aerosol-forming substrate located within the heating chamber 10 may be heated to generate an aerosol by the IR beam 32 entering the heating chamber 10 through the first sidewall 12a via the IR transparent material 28.

[0108] The light reflecting and scattering possibilities are exploited to irradiate the majority of the aerosol-forming substrate through the transmissive first side wall 10a of the heating chamber 10. Thereby, a flat thermal gradient may be achieved.

[0109] Reflectance of the IR beam 32 into the heating chamber 10 is advantageously enhanced by the aerosol-generating device walls 34, which include an IR-reflective material 30 and are inclined at an angle of less than 90 degrees to the longitudinal axis of the aerosol-generating device. The walls 34 therefore act as beam guiding means. The angle may be optimized for the light direction and substrate position.

[0110] Figures 3a to 3c show cross-sections of an aerosol generating device in side view, with the mouth end of the device being shown at the top of the figure.

[0111] As shown in Figure 3a, the aerosol generating device of Figures 3a-3c comprises a heating chamber 10 for receiving an aerosol-forming substrate 36 and a heater assembly for heating the aerosol-forming substrate 36. The heater assembly comprises a photonic device 12. The heating chamber 10 is disposed between the photonic device 12 and the mouth end of the aerosol generating device with respect to the longitudinal axis of the aerosol generating device. The bottom wall of the heating chamber facing the photonic device 12 is made of a material transparent to electromagnetic radiation (e.g. IR light).

[0112] The aerosol generating device further comprises a cooling system 14, a control unit 16, a power supply 18, and a device housing 24. An air inlet is present but is not shown in FIG.

[0113] The aerosol-forming substrate 36 may be inserted into the heating chamber 10 via a reclosable lid 40 comprising a hinged door, as shown in FIG. 3b. The reclosable lid 40 is located in the side wall of the aerosol-generating device between the proximal end of the heating chamber 10 and the distal end of the heating chamber 10 relative to the longitudinal axis of the aerosol-generating device. FIG. 3b also shows that the heating chamber 10 comprises a first side wall 10a parallel to the longitudinal axis of the heating chamber 10 and perpendicular to the longitudinal axis of the aerosol-generating device. The heating chamber 10 comprises a second side wall 10b disposed perpendicular to the first side wall 10a. The surface of the first side wall 10a is larger than the surface of the second side wall 10b.

[0114] The aerosol generating device of Figures 3a-3c further comprises a safety window 38. The safety window 38 is impermeable to electromagnetic radiation (e.g., IR radiation) emitted by the photonic device 12. The safety window 38 may comprise an IR blocking material. Thus, the safety window 38 may prevent potentially harmful IR radiation 32, shown in Figure 3c, from propagating towards the oral end of the aerosol generating device and irradiating the user.

[0115] The safety window 38 may include a reflective material. For example, an IR reflective coating may be present towards the interior of the heat chamber, such that the incident IR beam may be reflected back towards the heat chamber 12. The IR reflective coating may therefore act as a beam guiding means.

[0116] 4a-4e show cross-sections of the heating chamber 10 of an aerosol generating device in top view.

[0117] FIG. 4a shows a circular cross-section of the heating chamber 10 with the lid 40 in a closed configuration. FIG. 4b shows a circular cross-section of the heating chamber 10 with the lid 40 in an open configuration, the lid 40 comprising a sliding door. The aerosol-forming substrate may be inserted through an opening 42. FIG. 4c shows a circular cross-section of the heating chamber 10 with the lid 40 in an open configuration, the lid 40 comprising a hinged door. FIG. 4d shows a rectangular cross-section of the heating chamber 10 with the lid 40 in a closed configuration. FIG. 4e shows a rectangular cross-section of the heating chamber 10 with the lid 40 in an open configuration. The lid 40 of FIGS. 4a-4e may comprise a safety interlock switch such that the photonic device 12 can only be operated when the opening 42 is closed.

Claims

1. An aerosol generating device, comprising: a heating chamber for receiving an aerosol-forming substrate; a heater assembly for heating the aerosol-forming substrate; the heater assembly comprising a photonic device configured to generate a beam of electromagnetic radiation; the aerosol-generating device is configured to heat an aerosol-forming substrate by directing the beam of electromagnetic radiation onto the aerosol-forming substrate; the heating chamber is disposed between the photonic device and an oral end of the aerosol generation device relative to a longitudinal axis of the aerosol generation device; the heating chamber having a first sidewall parallel to a longitudinal axis of the heating chamber and a second sidewall disposed perpendicular to the first sidewall; the surface area of ​​the first side wall is larger than the surface area of ​​the second side wall; the aerosol-generating device is configured to heat the aerosol-forming substrate by directing the beam of electromagnetic radiation through at least a portion of the first sidewall of the heating chamber and towards the aerosol-forming substrate; Aerosol generator.

2. 2. The aerosol generating device of claim 1, comprising beam guiding means for directing said beam of electromagnetic radiation towards said first side wall of said heating chamber.

3. 3. An aerosol generating device as claimed in claim 2, wherein the beam guiding means comprises a reflective surface arranged to deflect an incident beam of electromagnetic radiation towards the heating chamber.

4. 4. The aerosol generating device of claim 3, wherein the reflective surface is disposed on a slanted wall of the aerosol generating device, the slanted wall being slanted at an angle of less than 90 degrees with respect to a longitudinal axis of the aerosol generating device, and the slanted wall is disposed coaxially around the first side wall of the heating chamber, the first side wall of the heating chamber comprising an IR-transparent material.

5. An aerosol generating device according to any one of claims 2 to 4, wherein the beam guiding means comprises an IR reflective material.

6. 6. An aerosol generating device according to claim 1, comprising an airflow path extending through the heating chamber in a direction parallel to the first side wall of the heating chamber.

7. An aerosol generating device as described in any of claims 1 to 6, wherein at least a portion of the first side wall of the heating chamber has a window that is substantially transparent to the beam of electromagnetic radiation emitted by the photonic device, the window being located at a distal end of the heating chamber.

8. 8. The aerosol generating device of claim 7, wherein the window comprises one or more of fused silica, lithium fluoride, magnesium fluoride, calcium fluoride, barium fluoride, silicon, germanium, copper, zinc selenide, and sapphire.

9. An aerosol generating device according to any preceding claim, wherein the photonic device comprises an IR laser diode.

10. An aerosol generating device as described in any one of claims 1 to 9, comprising a cooling system for cooling the photonic device, the cooling system comprising an airflow path extending from an air inlet, past the photonic device, and into the heating chamber.

11. An aerosol generating device as described in any of claims 1 to 10, wherein at least a portion of a wall of the heating chamber comprises an IR blocking material, the IR blocking material being located at a proximal end of the heating chamber relative to the longitudinal axis of the aerosol generating device.

12. 12. An aerosol generating device according to any preceding claim, wherein one or both of the inner walls of the heating chamber and the inner walls of the aerosol generating device comprise or are coated with an IR-reflective material.

13. An aerosol generation system comprising an aerosol generating device according to any one of claims 1 to 12 and an aerosol-generating article comprising the aerosol-forming substrate, the aerosol-generating article being configured to be at least partially inserted into the heating chamber.

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