Light control device and method for realizing directional jumping of organic crystal

Abstract

The invention discloses a light control device and method for realizing directional jumping of an organic crystal, and the device comprises a supporting module which is located at one end of the lower part of the organic crystal and is used for enabling one end, close to the supporting module, of the organic crystal to deflect upwards; the light source module is used for generating laser; the laser irradiates the surface of one end, far away from the supporting module, of the organic crystal; and the organic crystal generates directional jump under the excitation of the laser. Based on the light-crystal resonance enhancement effect, directional jumping of the organic crystal is achieved through the arrangement of the supporting module and the light source module, the jumping direction of the organic crystal is controllable, the jumping efficiency is high, the organic crystal after jumping is complete in shape, and the stability of the organic crystal is improved. By means of the device and the method, controllable, lossless and efficient directional jumping of the organic crystal can be achieved, and the device and the method can be widely applied to the field of flexible photoelectronics, light-operated micro-actuation or micro-robots.

Description

Technical Field

[0001] This invention belongs to the field of optical technology, and in particular relates to a device and method for optical manipulation to achieve directional jumping of organic crystals. Background Technology

[0002] Organic molecular micro- and nanocrystals, possessing both the long-range order of crystals and the designability of molecules, have become emerging carriers in the fields of flexible optoelectronics, optically controlled micro-actuators, and microrobots. However, traditional research has largely focused on their optical, electrical, or chemical stability, with insufficient attention paid to their mechanical response in light fields. In recent years, scientists have discovered that certain organic micro- and nanocrystals with special crystal structures or surface ligand modifications can generate instantaneous thermal stress, photogenerated charges, or photoisomerization under pulsed laser irradiation, thereby inducing asymmetric deformation and momentum transfer, achieving "photomechanical jumping." This phenomenon not only provides new ideas for fuelless, remotely driven microactuators but also lays the foundation for understanding the optical-mechanical coupling mechanism and developing environmentally adaptive microrobots. However, existing photomechanical crystal jumping techniques suffer from problems such as uncontrollable jumping direction, easy crystal damage caused by short-wavelength lasers, and low energy conversion efficiency during crystal jumping. Summary of the Invention

[0003] In order to overcome at least one of the problems existing in the prior art, one of the objectives of the present invention is to provide an optical manipulation device for realizing directional jumping of organic crystals, which enables controllable, non-destructive and efficient directional jumping of organic crystals.

[0004] The second objective of this invention is to provide a method for optical manipulation to achieve directional jumping of organic crystals.

[0005] The third objective of this invention is to provide an application of the above-mentioned optical manipulation device or optical manipulation method.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A first aspect of the present invention provides an optical manipulation device for realizing directional jumping of organic crystals, comprising: A support module, located at one end below the organic crystal, is used to deflect the end of the organic crystal closer to the support module upwards. A light source module is used to generate laser light; the laser light irradiates the surface of the organic crystal at the end away from the support module; the organic crystal undergoes directional jumping under the excitation of the laser light.

[0007] In some embodiments of the present invention, the light source module includes a laser and an optical polarizer; the laser is used to generate laser light; the optical polarizer is used to adjust the polarization direction of the laser light so that the laser light irradiates the surface of the organic crystal.

[0008] In some embodiments of the present invention, the organic crystal is strip-shaped; the length of the organic crystal is 1~100μm, the width is 1~10μm, and the thickness is 0.1~1μm.

[0009] Specifically, the length of the organic crystal can be any value or a range between 1 μm, 10 μm, 20 μm, 30 μm, 50 μm, 70 μm, or 100 μm. In some specific embodiments of the present invention, the length of the organic crystal is 10~30 μm.

[0010] Specifically, the width of the organic crystal can be any value or a range between 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, or 10 μm. In some specific embodiments of the present invention, the width of the organic crystal is 2 to 4 μm.

[0011] Specifically, the thickness of the organic crystal can be any value or a range between 0.1 μm, 0.2 μm, 0.3 μm, 0.4 μm, 0.5 μm, 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm, or 1 μm. In some specific embodiments of the present invention, the thickness of the organic crystal is 0.3 to 0.7 μm.

[0012] In some embodiments of the present invention, the support module is strip-shaped; the length of the support module is 1~10μm, the width is 0.5~5μm, and the thickness is 100~1000nm. In some specific embodiments of the present invention, the support module is a support rod.

[0013] Specifically, the length of the support module can be any value or a range between 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, or 10μm. In some specific embodiments of the present invention, the length of the support module is 3~5μm.

[0014] Specifically, the width of the support module can be any value or a range between 0.5μm, 1μm, 1.5μm, 2μm, 2.5μm, 3μm, 3.5μm, 4μm, 4.5μm, or 5μm. In some specific embodiments of the present invention, the width of the support module is 1~2μm.

[0015] Specifically, the thickness of the support module can be any value or a range between 100nm, 200nm, 300nm, 400nm, 500nm, 600nm, 700nm, 800nm, 900nm, or 1000nm. In some specific embodiments of the present invention, the thickness of the support module is 300~500nm.

[0016] In some embodiments of the present invention, the horizontal distance between the end of the organic crystal near the support module and the support module is 10 to 30% of the length of the organic crystal.

[0017] Specifically, the horizontal distance between the end of the organic crystal near the support module and the support module can be any value of 10%, 15%, 20%, 25% or 30% of the length of the organic crystal, or a range between any two.

[0018] By controlling the placement of the support module, a micro-nano "seesaw" structure composed of organic crystal and support module can be formed, so that the organic crystal can vibrate up and down with the support module as the fulcrum under the action of laser, thereby achieving directional jumping.

[0019] In some embodiments of the present invention, the wavelength of the laser is 780~1100nm.

[0020] Specifically, the wavelength of the laser can be any value or a range between 780nm, 800nm, 850nm, 900nm, 950nm, 1000nm, 1050nm, or 1100nm. In some specific embodiments of the present invention, the wavelength of the laser is 1000~1100nm.

[0021] The laser used in this invention is a long-wavelength near-infrared light, which can effectively avoid the damage to organic crystals caused by short-wavelength lasers. Furthermore, the optical manipulation device of this invention uses a near-infrared laser as the driving light source, yet it can still achieve photoinduced jumping in organic crystals. This demonstrates that this invention can achieve efficient utilization of the light source and has high jumping energy conversion efficiency.

[0022] In some embodiments of the present invention, the irradiation power of the laser is ≤1W.

[0023] Specifically, the irradiation power of the laser can be any value or a range between 10mW, 40mW, 60mW, 80mW, 100mW, 120mW, 140mW, 160mW, 200mW, 300mW, 500mW, 700mW, 900mW, or 1W. In some specific embodiments of the present invention, the irradiation power of the laser is 10~200mW.

[0024] This invention can adjust the jumping distance of organic crystals by adjusting the irradiation power of the laser, and within the irradiation power range of the laser of this invention, controllable, non-destructive, and efficient directional jumping of organic crystals can be achieved.

[0025] In some embodiments of the present invention, the scanning frequency of the laser is ≤100kHz.

[0026] Specifically, the scanning frequency of the laser can be any value selected from 1kHz, 3kHz, 5kHz, 7kHz, 9kHz, 10kHz, 40kHz, 60kHz, 80kHz, and 100kHz, or a range between any two. In some specific embodiments of the present invention, the scanning frequency of the laser is 1~10kHz.

[0027] Since different organic crystals have different resonant frequencies with lasers, the laser scanning frequency can be adjusted according to different organic crystals to ensure that the laser scanning frequency can be consistent with the inherent frequency of the organic crystal itself, thereby realizing the photoinduced jumping of the organic crystal.

[0028] In some embodiments of the present invention, the laser irradiates the organic crystal with a gradually increasing scanning frequency; the organic crystal vibrates up and down around the support module under the excitation of the laser; when the scanning frequency of the laser is consistent with the natural frequency of the organic crystal itself, the organic crystal undergoes directional jumping.

[0029] In some embodiments of the present invention, the horizontal direction of the directional jump is from the laser irradiation position to the support module and is parallel to the length direction of the organic crystal.

[0030] In some embodiments of the present invention, the take-off speed of the directional jump is ≥40000μm / s.

[0031] Specifically, the take-off speed of the directional jump can be any value or a range between 40,000 μm / s, 50,000 μm / s, 60,000 μm / s, 70,000 μm / s, 80,000 μm / s, 90,000 μm / s, or 100,000 μm / s.

[0032] In some embodiments of the present invention, the jumping distance of the organic crystal is directly proportional to the irradiation power of the laser.

[0033] Since the greater the laser irradiation power, the greater the optical force generated by the laser on the organic crystal, the jumping distance of the organic crystal can be controlled by adjusting the laser irradiation power.

[0034] In some embodiments of the present invention, the jumping distance of the organic crystal is ≥100μm.

[0035] Specifically, the jump distance of the organic crystal can be any value or a range between 100 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, or 1000 μm. In some specific embodiments of the present invention, the jump distance of the organic crystal is 150~580 μm.

[0036] In some embodiments of the present invention, the organic crystal includes at least one of indigo organic crystal, cellulose organic crystal, or anthracene derivative organic crystal; in some specific embodiments of the present invention, the organic crystal is selected from indigo organic crystal.

[0037] In some embodiments of the present invention, the material of the support module includes at least one of indigo organic crystal, cellulose organic crystal, or anthracene derivative organic crystal; in some specific embodiments of the present invention, the material of the support module is selected from indigo organic crystal.

[0038] A second aspect of the present invention provides a method for optical manipulation to achieve directional jumping in organic crystals, comprising the following steps: The support module is placed at one end below the organic crystal, causing the organic crystal to deflect upward at the end closest to the support module; A laser is generated using a light source module; the laser is then directed to irradiate the surface of the organic crystal at one end away from the support module; the organic crystal undergoes directional jumping under the excitation of the laser.

[0039] In some embodiments of the present invention, the optical manipulation method of the second aspect of the present invention is implemented using the optical manipulation device of the first aspect of the present invention.

[0040] The third aspect of the present invention provides an application of the optical manipulation device as described in the first aspect of the present invention, or the optical manipulation method as described in the second aspect of the present invention, in the fields of flexible optoelectronics, optically controlled micro-actuators, or micro-robots.

[0041] The beneficial effects of this invention are: Based on the optical-crystal resonance enhancement effect, this invention achieves directional jumping of organic crystals through the setting of support modules and light source modules, and the jumping direction of organic crystals is controllable, the jumping efficiency is high, and the organic crystals have complete morphology after jumping. Using the device and method of this invention, controllable, non-destructive, and efficient directional jumping of organic crystals can be achieved, which has wide applications in the fields of flexible optoelectronics, optically controlled micro-actuators, or micro-robots. Attached Figure Description

[0042] Figure 1This is a schematic diagram of the optical manipulation device for achieving directional jumping of organic crystals in Embodiment 1 of the present invention.

[0043] Figure 2 This is a schematic diagram of the organic crystal before directional jumping in Embodiment 2 of the present invention.

[0044] Figure 3 This is a schematic diagram of the directional jumping process of the organic crystal in Embodiment 2 of the present invention.

[0045] Figure 4 This is a graph showing the relationship between the organic crystal skipping distance and the laser irradiation power in Embodiment 3 of the present invention.

[0046] Reference numerals: 101-glass slide; 102-transparent tape; 201-support rod; 202-organic crystal; 301-light source module. Detailed Implementation

[0047] The following specific embodiments further illustrate the content of the present invention in detail. It should also be understood that the following embodiments are only for further explanation of the present invention and should not be construed as limiting the scope of protection of the present invention. Non-essential improvements and adjustments made by those skilled in the art based on the principles described herein are all within the scope of protection of the present invention. The specific process parameters, etc., in the following examples are merely examples within a suitable range; that is, those skilled in the art can make selections within a suitable range based on the description herein, and are not intended to be limited to the specific data in the examples below. Unless otherwise specified, the raw materials, reagents, or apparatus used in the following embodiments and comparative examples can be obtained from conventional commercial sources or by existing known methods.

[0048] In embodiments of the present invention, the organic crystal includes at least one of indigo organic crystal, cellulose organic crystal, or anthracene derivative organic crystal.

[0049] The following embodiments specifically use indigo organic crystals as examples. It is understood that the apparatus and method of the present invention are also effective for cellulose organic crystals and anthracene derivative organic crystals.

[0050] Preparation Example 1 An organic indigo crystal, the preparation steps of which are as follows: Step 1: Dissolve 5g (23.58mmol) of 6-bromoindol-2-one and 5.3g (23.58mmol) of 6-bromoisatin in 80mL of glacial acetic acid, and then add 0.5mL of concentrated hydrochloric acid; Step 2: Heat the above mixture to 100°C and reflux it for 24 hours with vigorous stirring; Step 3: After the reaction is complete, filter the mixture and wash the filter cake successively with water, ethanol and ethyl acetate; after vacuum drying, obtain indigo organic crystal powder. Step 4: Add indigo organic crystal powder to 50 mL of deionized water to prepare an organic crystal suspension; Step 5: Use a microsyringe to draw 1 mL of organic crystal suspension and drop it onto a glass slide with transparent tape. To reduce the adhesion and friction between the glass slide and the organic crystal, a layer of transparent tape with a thickness of 0.2 mm is attached to the glass slide. Step 6: The organic crystal suspension dropped onto the glass slide is allowed to air dry and evaporate at room temperature (4 hours) to obtain spatially dispersed indigo organic crystals; the crystals are 20 micrometers long, 3 micrometers wide, and 0.5 micrometers thick.

[0051] Example 1 A schematic diagram of a light manipulation device for achieving directional jumping of organic crystals is shown below. Figure 1 As shown, the details are as follows: The substrate is specifically composed of a glass slide 101 and a transparent adhesive tape 102 on top of it; The support rod 201 is an indigo organic crystal rod with a length of 3-5 micrometers, a width of 1-2 micrometers, and a thickness of 300-500 nanometers. The support rod 201 is located at the right end below the organic crystal 202, causing the right end of the organic crystal 202 to be deflected upwards. The horizontal distance between the support rod 201 and the right end of the organic crystal 202 is 3-5 micrometers. The light source module 301 specifically consists of a laser and an optical polarizer. The laser generates laser light, and the optical polarizer adjusts the polarization direction of the laser to irradiate the surface of the organic crystal 202. The laser irradiates the left end surface of the organic crystal 202. The laser is a near-infrared helium-neon laser with a wavelength of 1064nm and a continuously adjustable power of 0-1W. The emitted light from the laser passes through an optical polarizer (specifically an acousto-optic deflector) to adjust the deflection direction. The laser scanning path is a program unique to this system, consisting of a series of scanning points. Simple programs can be generated by software, while complex programs need to be written manually in a blank text file. Each line of data represents the x and y coordinates of a scanning point. After writing the program, change the file extension to .tsf and import it into the system. The laser will then scan each point according to its coordinates and continuously cycle through the scan.

[0052] Example 2 A method for optical manipulation to achieve directional jumping of organic crystals is implemented using the optical manipulation device of Example 1. The specific steps are as follows: Using a near-field fiber optic probe, the target organic crystal obtained in Preparation Example 1 was moved above the support rod 201, thereby constructing a micro-nano "seesaw" structure composed of the organic crystal and the support rod, which will be used for the next step of the organic crystal directional jumping experiment. The laser is turned on with a wavelength of 1064nm and a power of 100mW. The laser scanning frequency is gradually increased from 1kHz to 10kHz, causing the laser to irradiate the crystal surface and generate optical radiation pressure, resulting in vertical vibration. By changing the laser scanning frequency, the vibration frequency of the crystal can be altered. When the 100mW laser irradiates the left end of the organic crystal, it vibrates vertically. As the laser scanning frequency gradually increases from 1kHz to 10kHz, when the crystal's vibration frequency matches its natural frequency, a resonance phenomenon occurs. This resonance effect greatly increases the energy of the crystal vibration, enhancing energy conversion efficiency. Due to the leverage effect, a counter-current impulse is generated, allowing the organic crystal to momentarily overcome the constraints of gravity and other resistances, achieving a directional jump and returning to the glass slide. After this jump, the organic crystal remains undamaged and unbroken.

[0053] Figure 2 This diagram illustrates the organic crystal before directional jumping, where a is a bright-field micrograph of the organic crystal; b is a fluorescence micrograph of the organic crystal; and c is a schematic diagram of the organic crystal vibrating up and down like a seesaw with a support rod as the fulcrum under the influence of a laser. Figure 2 As shown, Figure 2 In the image 'a', there is a micrograph of the indigo organic molecular crystal. It can be seen that the prepared indigo organic crystal is strip-shaped, with a length of 20 micrometers, a width of 3 micrometers, and a thickness of 0.5 micrometers. Figure 2 Image b in the image is a fluorescence image of the same indigo organic crystal. It can be seen that when excited with green light, the crystal emits red fluorescence. Figure 2 Figure 'c' shows an experimental diagram of an indigo organic crystal placed on a micro support rod. As can be seen, when the laser shines on the left end of the organic crystal, the left end vibrates up and down. Due to the high vibration frequency, the left end of the organic crystal becomes blurred under the microscope.

[0054] Figure 3 This is a schematic diagram illustrating the directional jumping process of an organic crystal. Since the organic crystal jumps beyond the display screen, an image is captured every 100 micrometers by moving the microscope stage. These images are then stitched together to determine the crystal's final position after the jump. Figure 3As can be seen, when the laser power irradiates the crystal at 100mW, the crystal jump distance is 360 micrometers, the jump speed is greater than 40000μm / s, and the error between the actual jump direction and the predetermined jump direction is less than 10°. The lower left is before the jump, and the upper right is after the jump. It can be observed that the organic crystal did not break or get damaged after completing the jump.

[0055] Example 3 A method for optical manipulation to achieve directional jumping of organic crystals differs from Example 2 in that the laser irradiation power is adjusted to be in the range of 40~160mW, while other conditions are the same as in Example 2.

[0056] The distance that an organic crystal jumps under laser excitation with different irradiation powers was measured. Figure 4 This is a graph showing the relationship between the hopping distance of an organic crystal and laser irradiation power. From... Figure 4 It is evident that the jumping distance of the organic crystal is directly proportional to the laser irradiation power. When the incident laser power is 40–160 mW, the jumping distance of the crystal is 150–580 μm. This is because the higher the laser irradiation power, the greater the optical force generated by the laser on the organic crystal. Therefore, by adjusting the laser irradiation power, the jumping distance of the organic crystal can be controlled. The jumping direction of the organic crystal is related to the placement of the organic crystal and the support rod. By adjusting the placement of the organic crystal and the support rod, directional jumping of the organic crystal can be achieved.

[0057] As can be seen from the above, the embodiments of the present invention can effectively control the direction of crystal jumping, making the error between the actual jumping direction and the predetermined jumping direction less than 10°; and because it uses near-infrared light with a wavelength of 1064nm, which has stronger compatibility, as the driving light source, it can effectively reduce the damage of the light source to the crystal, and solve the problems of crystal explosion and breakage caused by the existing technology that can only use blue light or ultraviolet light to drive the crystal. Finally, the crystal after jumping is intact and has not broken or damaged; and the embodiments of the present invention utilize the light-crystal resonance enhancement effect to significantly improve the jumping efficiency. By adjusting the laser irradiation power, a crystal jumping distance of 150~580μm can be achieved, and the jumping speed is greater than 40000μm / s, with high crystal jumping energy conversion efficiency.

[0058] In summary, this invention, based on the optical-crystal resonance enhancement effect, achieves directional jumping of organic crystals through the configuration of a support module and a light source module. Furthermore, the jumping direction of the organic crystals is controllable, the jumping efficiency is high, and the morphology of the organic crystals remains intact after jumping. The device and method of this invention can realize controllable, non-destructive, and efficient directional jumping of organic crystals, and it has wide applications in the fields of flexible optoelectronics, optically controlled micro-actuators, or micro-robots.

Claims

1. An optical manipulation device that enables directed hopping of organic crystals, characterized by, The application relates to a light manipulation device and a light manipulation method. The application comprises: a support module, which is arranged at one end below an organic crystal and is used for deflecting the organic crystal upwards at the end close to the support module; 2. The light manipulation device of claim 1, wherein, a light source module, which is used for generating laser light; the laser light is irradiated on the surface of the end of the organic crystal far from the support module; and the organic crystal is caused to directionally jump under the excitation of the laser light.

3. The light manipulation device of claim 1, wherein, The light source module comprises a laser and a light polarizer; the laser is used for generating laser light; and the light polarizer is used for adjusting the polarization direction of the laser light so that the laser light is irradiated on the surface of the organic crystal. The shape of the organic crystal is strip-shaped; the length of the organic crystal is 1-100 mu m, the width is 1-10 mu m, and the thickness is 0.1-1 mu m; 4. The light manipulation device of claim 1, wherein, And / or, the shape of the support module is strip-shaped; the length of the support module is 1-10 mu m, the width is 0.5-5 mu m, and the thickness is 100-1000 nm.

5. The light manipulation device of claim 1, wherein, The horizontal distance between the end of the organic crystal close to the end of the support module and the support module is 10-30% of the length of the organic crystal. The wavelength of the laser light is 780-1100 nm; And / or, the irradiation power of the laser light is less than or equal to 1 W; 6. The light manipulation device of claim 1, wherein, And / or, the scanning frequency of the laser light is less than or equal to 100 kHz.

7. The light manipulation device of claim 1, wherein, The laser light is irradiated in a gradually increased scanning frequency mode; the organic crystal first vibrates up and down around the support module under the excitation of the laser light; when the scanning frequency of the laser light is consistent with the inherent frequency of the organic crystal itself, the organic crystal directionally jumps.

8. The light manipulation device of claim 1, wherein, The jumping distance of the organic crystal is in a positive proportional relationship with the irradiation power of the laser light.

9. A method for light manipulation implementing directed organic crystal hopping, characterized in that, The organic crystal comprises at least one of indigo organic crystals, cellulose organic crystals or anthracene derivative organic crystals. The application comprises the following steps: arranging a support module at one end below an organic crystal so as to deflect the organic crystal upwards at the end close to the support module; generating laser light by using a light source module; irradiating the laser light on the surface of the end of the organic crystal far from the support module; and causing the organic crystal to directionally jump under the excitation of the laser light.

10. Application of the light manipulation device according to any one of claims 1-8 or the light manipulation method according to claim 9 in the field of flexible optoelectronics, light-controlled micro-actuation or micro-robot.

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