34 results about "Selective reflection" patented technology

The invention relates to the technical field of functional polymer composite materials, in particular to an intermediate film for laminated glass based on color generation of a photonic crystal structure and a preparation method of the intermediate film. The intermediate film comprises a thermoplastic resin matrix and a three-dimensional photonic crystal structure region dispersed in the thermoplastic resin matrix, wherein the three-dimensional photonic crystal structure region is formed by self-assembly of monodisperse microspheres, and the central wavelength of a photonic forbidden band of the region is located in a visible light range. According to the invention, a three-dimensional photonic crystal structure is constructed in the intermediate film, and structural color generation is generated by utilizing selective reflection of the photonic band gap effect on visible light with a specific wavelength. According to the laminated glass, the color is generated by interference of light instead of absorption of chemical pigments, so that the color can be continuously and regularly changed along with the change of an observation angle or an incident light angle, the dynamic and changing visual aesthetic feeling is given to the laminated glass, and the higher requirements of the fields of modern buildings, automobiles and the like on dynamic aesthetics and personalized appearance are met.

The invention discloses a multi-wavelength composite light spot laser treatment device, which belongs to the field of laser treatment and comprises a laser coupling unit, a quartz shell, a lens group and a base, divergent light beams output by a laser are shaped into annular light beams through a laser coupling unit, and the composite annular light beams with multiple wavelengths are selectively reflected and transmitted through at least one conical lens which is installed in a shell and plated with a dichroic membrane. An axial annular light beam under the reflection wavelength is converted into a circumferential annular light beam, the transmitted axial annular light beam is converted into a collimated light beam through a second conical lens in the base and then is output in the axial direction, and then the axial collimated light beam with the specific wavelength and the circumferential annular light beam with the specific wavelength are output at the same time through the same device. Changes of different wavelengths, different light beam shapes and different light beam directions can be completed through one device, a compound treatment effect can be conveniently played in the laser medical field, and the practicability of a laser medical instrument is improved.

The invention discloses an independent chiral liquid crystal optical device based on dynamic frequency regulation and control and a preparation method of the independent chiral liquid crystal optical device. The independent chiral liquid crystal optical device comprises a conductive substrate, an alignment layer, a cholesteric liquid crystal layer with a stable polymer and an electrode, the precursor mixture is prepared from a nematic phase liquid crystal matrix, a chiral dopant, a polymerizable liquid crystal monomer and a photoinitiator; and the screw pitch of the cholesteric liquid crystal layer is dynamically regulated and controlled through the frequency of an alternating current electric field, so that the dynamic regulation of the selective reflection center wavelength is realized. The cholesteric liquid crystal is packaged between the two conductive substrates, the spiral structure and the photonic band gap characteristics of the cholesteric liquid crystal are accurately regulated and controlled through alternating current electric field frequency parameters, real-time dynamic modulation of the output light wavelength and the circular polarization state is achieved, the limitation of concentration curing of a traditional chiral agent is broken through, and the chiral liquid crystal is obtained. The dynamic reconfigurable control of output characteristics of circularly polarized light is realized, and the dynamic reconfigurable circularly polarized light engine is used as a universal circularly polarized light engine, has a plug-and-play characteristic, and can be directly integrated with various light emitting units.

A thin optical device having high light utilization efficiency and less chromatic aberration and a small electronic device including the optical device are provided. The thin optical device includes a first reflective polarizing plate, a lens, an optical rotator, a retardation plate, and a second reflective polarizing plate. The optical device can be a thin optical device by rotation of the polarization plane of linearly polarized light with the optical rotator and utilization of a property of selectively reflecting circularly polarized light of the second reflective polarizing plate. Furthermore, the optical device does not use a half mirror and thus has a property of high light utilization efficiency. When the second reflective polarizing plate has a layered structure, chromatic aberration of an optical system can be reduced.

This invention discloses an optically pumped tunable vertical-cavity surface-emitting laser (VCSEL), a mirror, and their applications. The wavelength-selective mirror includes a phase-matching region and an optimization region arranged sequentially along the vertical direction. The phase-matching region is formed by periodically alternating stacks of x pairs of first high-refractive-index material layers and first low-refractive-index material layers along the vertical direction. The optimization region is formed by y pairs of second high-refractive-index material layers and z pairs of second low-refractive-index material layers, which are alternately stacked along the vertical direction, and the optical thicknesses of the second high-refractive-index material layers and the second low-refractive-index material layers are unequal. This invention breaks away from the traditional single optimization paradigm centered on lasing light in DBRs, significantly improving optical pumping efficiency while ensuring a wide tuning range and free spectral range, thereby realizing a highly efficient wide-tunable single-longitudinal-mode output MEMS-VCSEL, laying the foundation for next-generation high-performance tunable lasers.

The application discloses a low-scattering large-angle wave-transparent electromagnetic metasurface based on angle multiplexing, which comprises an angle selection layer and a phase control layer; the phase control layer is used for controlling the reflection phase of an angle incident electromagnetic wave in a first range; the angle selection layer is used for selectively transmitting an angle incident electromagnetic wave in a second range and selectively reflecting an angle incident electromagnetic wave in the first range, and comprises a second dielectric substrate and metal grounds on the upper and lower surfaces of the second dielectric substrate, the upper metal ground is etched with first and second slot structures, and the lower metal ground is etched with third and fourth slot structures; the two layers of slot structures are arranged in a staggered mode in a unit arrangement direction of a plane, and the first, second, third and fourth slot structures extend to the edges of the unit structures along another unit arrangement direction of the plane and are in communication with the slot structures of adjacent units. The application realizes the integration of scattering suppression and large-angle wave-transparent functions, and effectively improves the function multiplexing capability and system integration degree of the electromagnetic metasurface device.

The application discloses a novel multi-mode display material and a preparation method thereof. The novel multi-mode display material comprises a multi-mode display layer, and the multi-mode display layer is formed by compounding a CLCE matrix and an up-conversion luminescent material. The CLCE matrix is a controllable cross-linking density elastic network with a spiral superstructure, and the spiral pitch of the CLCE matrix is regulated by a chiral agent concentration, a mechanical force or heat, so that a photonic band gap is regulated. Meanwhile, the chiral agent can also regulate a chiral selective reflection function through the chirality of the chiral agent. The up-conversion luminescent material comprises a functionalized luminescent component, the functionalized luminescent component is combined with the CLCE matrix through a covalent grafting or an adaptive dispersion mode, and the functionalized luminescent component can generate up-conversion luminescence under excitation of specific wavelength light. Through the synergistic effect of the CLCE matrix and the up-conversion luminescent material, the multi-mode display layer has four-dimensional orthogonal optical functions of mechanical response, thermal response, light response and chiral selective reflection.

Provided is a head-up display system and a transportation machine including the head-up display system, the head-up display system including a windshield glass having a selective reflection layer and a projector including laser light sources of three colors of blue light, green light, and red light for forming a projection image on the windshield glass,in which the selective reflection layer includes the following selective reflection central wavelengths λB, λG, and λR at a light incidence angle of 60°,400⁢ nm≤λB<500⁢ ⁢nm500⁢ nm≤λG<600⁢ ⁢nm600⁢ nm≤λR<700⁢ ⁢nmall of XB / XG, XB / XR, and XG / XR are in a range of 0.80 to 1.20.In the above, XB=RB×LB, XG=RG×LG, and XR=RR×LR.RB, RG, and RR indicate a natural light reflectivity at λB, λG, and λR, and LB, LG, and LR indicate the brightness of blue, green, and red laser beam emitted from the projector.

The invention provides a focusing type compound lens and a folding optical system, which can realize diopter adjustment while reducing the optical thickness. The focusing type compound lens comprises a light incident lens layer; the first electrode layer is positioned on the light-emitting side of the light-in lens layer and is used for applying a first voltage; the second electrode layer is positioned on one side, far away from the incident lens layer, of the first electrode layer and is used for applying a second voltage different from the first voltage so as to form an electric field between the first electrode layer and the second electrode layer; the nematic phase liquid crystal layer is arranged in an electric field between the first electrode layer and the second electrode layer and is used for being electrically controlled to focus; and the selective reflection assembly is stacked on the light outlet side of the light inlet lens layer and is used for selectively reflecting one kind of polarized light and selectively transmitting the other kind of polarized light.

The invention provides coated photovoltaic glass, a preparation method thereof and a photovoltaic module, and particularly relates to the technical field of solar cells. The film-coated photovoltaic glass comprises a photovoltaic glass original sheet; the coating layer is arranged on the surface of the photovoltaic glass sheet; the protective layer is arranged on the surface of the coating layer; the coating layer is made of CTO, and the protective layer is made of silicon dioxide. The CTO coating layer has a selective reflection design for infrared light, so that the temperature rise effect caused by infrared light absorption can be reduced, and the problems of output power reduction and temperature coefficient deterioration caused by temperature rise of the assembly are solved. CTO is used as a coating layer material and can be matched with the thermal expansion coefficient of a glass substrate, so that the influence of thermal stress is reduced; meanwhile, the silicon dioxide protective layer on the surface remarkably improves the stability of the coating layer in long-term outdoor use and reduces performance degradation by virtue of excellent weather resistance, and the performance of the photovoltaic glass is synergistically improved by combining the function of the CTO coating layer and the protective effect of the silicon dioxide protective layer.

This application discloses a polarization-independent chiral selective reflection and multidimensional optical field modulation device and method, relating to the fields of integrated photonics and micro / nano optics. The device includes: a geometrically phased liquid crystal layer, a transparent capping layer, a chiral metasurface array layer, a dielectric substrate layer, and a total reflection layer; wherein, the chiral metasurface array layer can break the in-plane mirror symmetry and exhibit chiral selective reflection characteristics in the target wavelength band. The geometrically phased liquid crystal converts the polarization state of arbitrary incident light into orthogonal left-handed and right-handed circularly polarized light. The chiral metasurface array layer selectively reflects one type of circularly polarized light while absorbing another type of circularly polarized light with the opposite chirality. The reflected circularly polarized light exits through the geometrically phased liquid crystal, achieving two-way phase modulation. This invention achieves geometrically phase modulation by four times the rotation angle of liquid crystal molecules, and has the advantages of compact structure, low crosstalk, low cost, and easy integration with semiconductor processes.

The present application provides a kind of reflecting film, windshield and head-up display system, the reflecting film has high visible light transmittance and can improve the brightness of display image, the transparency of appearance tone is good.The reflecting film has selective reflection layer, the selective reflection layer has the cholesteric liquid crystal layer formed by fixed cholesteric liquid crystal phase, in each range of the range of wavelength 400nm above and less than 500nm and the range of wavelength 500nm above and less than 600nm, the maximum value of natural light reflectance is 10%~25%, the difference between the maximum maximum value and the minimum minimum value is 3% or more, the added value of wavelength band of the region higher than the average of maximum value and minimum value is 20nm~80nm, in the range of wavelength 600nm above and 800nm below, the maximum value of natural light reflectance is 10%~25%, the added value of wavelength band of the region higher than the average of maximum value and minimum value is 120nm or more.

Provided are a heads up display system and a vehicle. An image generating device emits image light, which is reflected to a projection surface through a reflective assembly; a wavelength-selective reflective film is located on a reflective surface of the reflective assembly, realizing the selective reflection for different wavelength bands. The wavelength-selective reflective film is configured for reflecting at least part of the image light, ensuring that the image light is not affected by the arrangement of the wavelength-selective reflective film. When external interference light enters the heads up display system along a reverse optical path of the image light, the external interference light will first enter the wavelength-selective reflective film before entering the image generating device. The wavelength-selective reflective film only reflects interference light with the same wavelength band as the image light, thereby preventing the most of the interference light from entering the image generating device.

Disclosed is a substrate which has thereon a marking or layer comprising a salt-free cured chiral liquid crystal precursor composition which comprises one or more nematic compounds A and one or more chiral dopant compounds B which are capable of giving rise to a cholesteric state of the chiral liquid crystal precursor composition and are of formula (I) as set forth herein. Also disclosed is a method of providing the marking on the substrate. Also disclosed is a method of changing a position of a selective reflection band exhibited by the cured chiral liquid crystal precursor composition.

The invention relates to a doped TiO2 metasurface integrated optical system. The simulation modeling doping subsystem is used for realizing material directional design through preposed atomic-scale precise simulation, simulating and driving a modified titanium dioxide material to optimize a doping system, and outputting a refractive index dispersion curve and an extinction coefficient curve of a full visible light wave band; the metasurface integration subsystem selectively transmits a set phase incident ray in an original optical ray based on light polarization, and realizes the integration effect of multiple types of functions of polarization conversion, polarization selective reflection and aberration correction through three-dimensional parameter cooperation; dynamic compensation polarization crosstalk and phase deviation are complementary with static regulation and control, residual stray light is filtered, high-contrast vertical-direction linearly polarized light imaging is formed, and a complete optical system is formed; a system light path follows a light path complete process of polarization screening, integrated regulation and control, dynamic compensation and purification; the characteristics of high imaging quality and low loss are kept in a wide view field range; and the light path control precision and accuracy are improved.

The invention relates to a manufacturing method of an augmented reality optical waveguide and the augmented reality optical waveguide. The manufacturing method comprises the following steps: (a) a precursor layer configuration step: providing a liquid crystal precursor material layer on a transparent optical substrate; (b) curing and forming: curing the liquid crystal precursor material layer, fixedly forming a first liquid crystal grating with a first grating period in the first area, and fixedly forming a second liquid crystal grating with a second grating period in the second area; wherein regionalization modulation is carried out before or during the curing forming step, so that the first grating period is different from the second grating period, and the Bragg reflection center wavelengths of the first liquid crystal grating and the second liquid crystal grating are different. Through regionalization and differentiation regulation and control, selective reflection of light of different wavelengths is achieved on the same transparent optical substrate, and the problems that a traditional optical waveguide is poor in color uniformity and the field angle is limited are solved.

According to one embodiment, a display device includes a display panel and a light source unit provided along an edge portion of the display panel. The display panel includes a first transparent substrate, a second transparent substrate, a liquid crystal layer sealed between the first transparent substrate and the second transparent substrate, a third transparent substrate facing the first transparent substrate, and a selective reflective layer located between the first transparent substrate and the third transparent substrate. The selective reflective layer is configured to transmit light in a blue wavelength range and light in a green wavelength range and reflect light in a red wavelength range at a predetermined incident angle relative to its normal.

[Problem] To provide a light source device, a headlamp, a display device, and a lighting device having excellent heat dissipation. [Solution] A light source device includes a substrate, a phosphor, a light emitting element, and a wavelength-selective reflection member. The phosphor is disposed in contact with the substrate. The light emitting element emits excitation light that excites the phosphor. The wavelength-selective reflection member partially reflects the excitation light emitted from the light emitting element to guide the excitation light to the phosphor, and transmits fluorescent light emitted from the phosphor due to excitation caused by incidence of the excitation light, and the excitation light reflected by the phosphor.

The invention discloses a circularly polarized long-afterglow luminescent material based on perovskite quantum dots and a preparation method thereof, and belongs to the technical field of circularly polarized luminescent materials. According to the invention, inorganic long-afterglow fluorescent powder is used as a light absorption layer, all-inorganic perovskite quantum dots CsPbX3 with high luminous efficiency is used as a light conversion layer, and a circularly polarized long-afterglow luminescent material with a high luminous asymmetry factor is constructed by using the selective reflection effect of a cholesteric liquid crystal polymer film; the luminescent material is a composite flexible film with a three-layer structure, has ultra-long afterglow time and excellent luminescent performance, realizes full-visible spectrum tunable circular polarization long afterglow luminescence under the selective reflection action of cholesteric liquid crystal, has a luminescence asymmetry factor exceeding 1.3 and visualization time exceeding 30 min, and can be applied to the field of light emitting devices. The technical problems that an existing circular polarization long-afterglow material is single in light-emitting wave band, low in asymmetric factor, short in afterglow lasting time and the like are solved.

A reconfigurable thin-film photonic filter weight bank comprises at least one photodetector and at least one optical filtering device comprising a pair of reflective thin film stacks with an interstitial medium cavity therebetween forming an optical cavity. Operation of a bank occurs when the reflective film is more selectively reflective to a range of frequencies and is more translucent to frequencies outside the range. The bank can reconfigurably weight signals by varying the cavity sizes or complex indices of refraction, with one photodetector integrating the weighted signals. Detectors can also be embedded inside the individual cavities to output unweighted, but demultiplexed, electrical signals. A neuromorphic opto-electronic system comprises a plurality of interconnected artificial optical neurons, each including at least one thin film neuromorphic opto-electronic device with a reconfigurable thin-film photonic filter weight bank. Related methods are also disclosed.

The utility model provides a biological hydrogen production generating device, which belongs to the technical field of biological hydrogen production and comprises a generator base body, a lamp box and a light guide component. A hydrogen production module is contained in the generator base body; one side of the generator base body further communicates with a leading-out module used for leading out hydrogen; a light through hole vertically corresponding to the hydrogen production module is formed in the top of the generator base body; the lamp box is arranged on the top of the generator base body. A light-emitting part of the lamp box is arranged downwards towards the light through hole; the light guide assembly is arranged between the light through hole and the light emitting part of the lamp box, the light guide assembly comprises a plurality of layers of light guide plates which are arranged up and down at intervals, and each layer of light guide plate is covered with a wavelength selective reflecting layer; the wavelength selective reflecting layer is used for screening effective light segments, and the light guide plate is used for uniformly distributing light energy. According to the biological hydrogen production generating device, light paths can be uniformly distributed, effective light sections can be screened, the photothermal effect can be reduced, and the hydrogen production efficiency and quality can be further improved.

A light-emitting element according to an embodiment comprises: a semiconductor stack including a first semiconductor layer, an active layer, and a second semiconductor layer; a conductive layer disposed on a first surface of the semiconductor stack; a protective layer which is disposed on side surfaces of the conductive layer, a side surface of the semiconductor stack, and a first surface of the conductive layer, and which is spaced apart from a second surface opposite the first surface of the semiconductor stack; a contact electrode disposed on one surface of the semiconductor stack; and a selective reflective layer which is disposed, outside the protective layer, on the side surfaces of the conductive layer, the side surface of the semiconductor stack, and the first surface of the conductive layer, and which includes an opening overlapping the contact electrode. The reflective layer includes M (where M is an integer greater than or equal to 2) pairs of a first layer and a second layer, wherein the first layer of each pair is located closer to the semiconductor stack than the second layer, and the length of one end of the first layer in each pair may differ from the length of one end of the second layer.

An electromagnetic-wave reflecting panel which satisfies long-term durability, an electromagnetic-wave reflecting apparatus using the same, an electromagnetic-wave reflecting fence, a method for manufacturing such an electromagnetic-wave reflecting panel, and a method for evaluating such an electromagnetic-wave reflecting panel are provided. An electromagnetic-wave reflecting panel is configured to reflect an electromagnetic wave in a predetermined frequency band of 1 MHz to 300 GHz, and includes: a reflecting function layer configured to selectively reflect the electromagnetic wave in the predetermined frequency band; and a dielectric resin substrate configured to support the layer, in which an amount of change in visible-light transmittance of the panel after putting the panel in an environment of a temperature of 40° C. to 80° C. for 2 to 720 hours, or in an environment of a temperature of 50° C. and a humidity of 95% for 2 to 720 hours is 10% or smaller, and ΔE*ab is 3.0 or smaller.

To provide an optical interference circuit which is applied to a system for transmitting and frequency-converting frequency reference light and can transmit each of a plurality of frequencies of the frequency reference light while maintaining high frequency accuracy.SOLUTION: An optical interference circuit according to the present invention includes a waveguide circuit unit in which an optical waveguide is formed on a substrate, and a frequency conversion unit that converts a frequency of frequency reference light, in which the waveguide circuit unit further includes a reproduction reference light input port, a frequency reference light input / output port, a transmission path fiber input / output port, a first coupler, a frequency selective reflection unit, a frequency synchronization detection circuit, a first detection light output port, a transmission path length fluctuation detection circuit, and a second detection light output port, and the frequency synchronization detection circuit further includes one second coupler. The transmission line length fluctuation detection circuit further includes one third coupler and one fourth coupler connected to the third coupler.SELECTED DRAWING: Figure 4

The utility model provides a novel safety warning device which is composed of multiple layers of materials, namely a base material layer, a visible light visual material layer, a broadband wavelength selective reflecting layer, a corner reflector structure layer and a protective layer from the bottom layer to the outermost layer in sequence. Wherein the broadband wavelength selective reflecting layer is a wavelength selective reflecting film formed by a plurality of layers of dielectric materials, is transparent to visible light, and has extremely high reflectivity to light in a working wave band of the vehicle-mounted laser radar; the corner reflector structure layer comprises a miniature rectangular prism, and laser radar signals can be effectively reflected back to an emission source of the corner reflector structure layer in a wide incidence angle range. By applying the safety warning device, the reflectivity and the retroreflection effect of the safety warning device under the two main laser radar working wavelengths of 905 nanometers and 1550 nanometers can be greatly improved, meanwhile, the visual characteristics required by human recognition are kept, and the running safety and reliability of an intelligent / automatic driving automobile are improved.

The application relates to the technical field of optical selective reflection structure, in particular to an infrared and laser compatible stealth film system structure based on DBR-metal, which has a specific structure of Ge-Al2O3-Ag type. The photonic crystal film layer is designed based on the working mechanism of a distributed Bragg reflector (DBR), so that the thin film structure of the stealth function has the purposes of achieving high reflectivity in the medium and far infrared and low reflectivity at a 10.6-micron wave band. The finally obtained film system structure better satisfies the purposes of achieving high reflectivity in the medium and far infrared and realizing "spectrum hole digging" low reflectivity at 10600 nm, and can perfectly realize the medium and far infrared and 10600-nm laser compatible stealth performance.

The invention provides a circularly polarized light generating device based on a cholesteric liquid crystal layer coupling reflector, and belongs to the technical field of optical devices and polarization control. The device comprises a light source, a cholesteric liquid crystal layer and a reflecting mirror. The cholesteric liquid crystal layer has a molecular structure in periodic spiral arrangement, can selectively reflect circularly polarized light in the same spiral direction as the cholesteric liquid crystal layer, and can transmit circularly polarized light in the opposite spiral direction as the cholesteric liquid crystal layer. The reflector is arranged on the transmission side of the cholesteric liquid crystal layer and used for receiving and reflecting the circularly polarized light transmitted by the cholesteric liquid crystal layer, so that the reverse rotation direction of the circularly polarized light is matched with the transmission direction of the back face of the cholesteric liquid crystal layer, and the circularly polarized light penetrates through the cholesteric liquid crystal layer again and is combined with initially reflected light to be output.

A display device includes an imaging element layer, a light-emitting element layer located closer to a display surface side than the imaging element layer, a selective reflection layer located between the imaging element layer and the light-emitting element layer and transmitting one of right-handed circularly-polarized light and left-handed circularly-polarized light and reflecting the other, and a retardation layer located between the selective reflection layer and the light-emitting element layer and having a switchable phase difference.

The invention relates to the field of optical devices, in particular to a multifunctional optical thin film and a vision correction lens comprising the same, and the multifunctional optical thin film is used for the vision correction lens. A first gradient refractive index layer; an embedded spectrum selective reflecting layer; a second gradient refractive index layer; and a protective layer; wherein the refractive index of the first gradient refractive index layer and the refractive index of the second gradient refractive index layer are continuously decreased from the binding layer to the protective layer, and the embedded spectrum selective reflection layer comprises a bottom high-reflection multilayer film, a silicon dioxide spacer layer and a top high-reflection multilayer film which are sequentially stacked; the problems that the total thickness of a film system is too large, interface reflection is increased, spectral performance interferes with each other, and edge view field angle dependence is high due to the fact that an anti-reflection film and an anti-blue-light film are compounded on a vision correction lens with the large curvature at the same time are solved.

This application relates to the field of building materials technology, and more particularly to a building coating material, its preparation method, and its application. A building coating material is provided, comprising a filler with selective reflectivity, a photoluminescent material, a polymer emulsion, additives, and water. The addition of the selectively reflective filler results in a coating with high reflectivity only within its spectral response band, enhancing the intensity of incident solar radiation and improving the power conversion efficiency of BiPV. Combined with the photoluminescent material, the photoluminescent material re-emits photons of specific wavelengths absorbed by the selectively reflective filler within the visible range, generating a photovoltaic effect, improving energy conversion efficiency, and simultaneously achieving effective radiative cooling. Therefore, the obtained building coating material is suitable for a wider range of building types and surfaces, possessing significant market potential and practical usability.