Light induction method and device for realizing controllable deformation of organic crystal

Abstract

The invention discloses a light induction method and device for realizing controllable deformation of an organic crystal, and belongs to the technical field of optics. The light induction method for realizing the controllable deformation of the organic crystal, provided by the invention, comprises the following steps: performing fixed-point scanning on the surface of the organic crystal by utilizing pulse laser, and enabling the organic crystal to generate controllable deformation along a scanning path formed by fixed-point scanning. The organic crystal disclosed by the invention can absorb light efficiently through a conjugated system, absorb light energy of pulse laser and instantly convert the light energy into local heat energy to form lattice thermal expansion; the heat energy can rapidly penetrate through the organic crystal to form an instantaneous temperature difference, the temperature difference induces an asymmetric stress field to enable the organic crystal to deform along a scanning path, the deformation is reversible, and the organic crystal can recover to the original state when no pulse laser is irradiated.

Description

Technical Field

[0001] This invention belongs to the field of optical technology, and in particular relates to a light-induced method and apparatus for realizing controllable deformation of organic crystals. Background Technology

[0002] Research on light-induced organic crystal deformation stems from the urgent need for controllable, contactless, and high-precision actuation materials. Traditional mechanical systems rely on electric motors, hydraulics, or thermal actuation, which suffer from drawbacks such as large size, high heat loss, and slow response. The rise of micro- and nano-robots, artificial muscles, and flexible electronics necessitates new media that directly convert light energy into macroscopic mechanical energy. Organic crystals, possessing both long-range order and designable molecular structures, can efficiently absorb light through conjugated systems, triggering cis-trans isomerization, photocyclization, dimerization, or free radical recombination in π→π*, n→π*, or charge-transfer excited states. This instantaneously alters the molecular configuration and cell parameters, generating anisotropic stress and achieving reversible bending, torsion, and expansion deformations. This process requires no conductive additives and can be remotely controlled with only weak light of specific wavelengths and intensities. Its background integrates molecular photochemistry, mechanical supramolecular science, and crystal engineering, providing new ideas for constructing cableless actuators, light-controlled valves, micro-walking devices, and adaptive optics components. It also lays the theoretical and experimental foundation for revealing the multi-scale coupling mechanism of "molecular motion-crystal deformation-macroscopic work." However, there is currently little research on photoinduced deformation of organic crystals, and how to achieve precise and controllable deformation of organic crystals remains a problem that urgently needs to be solved in this field. 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 a photo-induced method for realizing controllable deformation of organic crystals. This method is based on the coupling of multiple physical fields of light, heat and force, and can realize the reversible expansion and directional bending of organic crystals, providing a precise and controllable optical method for constructing micromachines and micro-nano robots.

[0004] The second objective of this invention is to provide a photo-induced device for realizing controllable deformation of organic crystals.

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

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The first aspect of the present invention provides a photo-induced method for achieving controllable deformation of an organic crystal, comprising the following steps: using a pulsed laser to perform a fixed-point scan on the surface of the organic crystal, causing the organic crystal to undergo controllable deformation along the scan path formed by the fixed-point scan.

[0007] In some embodiments of the present invention, the wavelength of the pulsed laser is 780~1100nm.

[0008] 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.

[0009] The laser used in this invention is a long-wavelength near-infrared light, which has good biocompatibility and can significantly avoid photo-oxidation and structural damage to organic crystals caused by ultraviolet and blue light bands while ensuring efficient excitation.

[0010] In some embodiments of the present invention, the single-point dwell time of the pulsed laser is ≥10µs.

[0011] Specifically, the single-point dwell time of the pulsed laser can be any value or a range between 10µs, 50µs, 100µs, 300µs, 500µs, 1ms, 10ms, 100ms, 500ms, or 1s. In some specific embodiments of the present invention, the single-point dwell time of the pulsed laser is 10µs to 300µs.

[0012] In this invention, the dwell time of the pulsed laser at a single point can be adjusted according to actual conditions and is not limited to the range listed above. By adjusting the dwell time of the pulsed laser at a single point, full coverage from "quasi-static point heating" to "high-frequency dynamic scanning" can be achieved.

[0013] In some embodiments of the present invention, the scanning frequency of the pulsed laser is ≤100kHz.

[0014] Specifically, the scanning frequency of the laser can be any value or a range between 1kHz, 3kHz, 5kHz, 7kHz, 9kHz, 10kHz, 20kHz, 40kHz, 60kHz, 80kHz, or 100kHz. In some specific embodiments of the present invention, the scanning frequency of the pulsed laser is 5~20kHz.

[0015] In some embodiments of the present invention, the irradiation power of the pulsed laser is ≤1W.

[0016] 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 pulsed laser is 10~200mW.

[0017] In some embodiments of the present invention, the beam quality factor of the pulsed laser is ≤1.2.

[0018] Specifically, the beam quality factor of the pulsed laser can be any value of 1, 1.05, 1.1, 1.15 or 1.2, or a range between any two.

[0019] In some embodiments of the present invention, the linewidth of the pulsed laser is ≤0.1nm.

[0020] Specifically, the linewidth of the pulsed laser can be any value of 0.01nm, 0.03nm, 0.05nm, 0.07nm, 0.09nm, or 0.1nm, or a range between any two.

[0021] By ensuring that the beam quality factor and linewidth of the pulsed laser are within the aforementioned range, the monochromaticity and spatial coherence of its scanning can be guaranteed.

[0022] In some embodiments of the present invention, the fixed-point scanning specifically includes the following steps: establishing a position coordinate axis on one side surface of the organic crystal for fixed-point scanning, recording the coordinate data x and y of the scanning point, and recording the single-point dwell time t and power value P of the scanning point, and establishing a scanning path about x, y, t and P; mapping the scanning path about x, y, t and P to the surface of the organic crystal, and performing fixed-point scanning.

[0023] In some embodiments of the present invention, the controllable deformation includes reversible stretching, reversible bending, or a combination thereof.

[0024] In some embodiments of the present invention, when the scanning path is located on the central axis of the organic crystal, the organic crystal undergoes reversible stretching and contraction along the central axis; when the scanning path is located on one side of the organic crystal, the organic crystal undergoes reversible bending along the scanning path.

[0025] In some embodiments of the present invention, the bending angle (θ) of the organic crystal undergoing reversible bending is directly proportional to the laser power (P) of the pulsed laser.

[0026] In some embodiments of the present invention, the bending angle (θ) of the organic crystal undergoing reversible bending is inversely proportional to the scanning speed (v) of the pulsed laser.

[0027] 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.

[0028] In some specific embodiments of the present invention, the organic crystal is selected from indigo organic crystal.

[0029] In some embodiments of the present invention, the bending angle θ of the indigo organic crystal undergoing reversible bending, the laser power P of the pulsed laser, and the scanning speed v of the pulsed laser are related by the following formula: θ = k × P / v, where k is 0.3~0.7 deg·mW. -1 ·mm·s -1 The unit of θ is deg, the unit of P is mW, and the unit of c is mm·s. -1 Specifically, the value of k mentioned above can be 0.3deg·mW. -1 ·mm·s -1 0.4deg·mW -1 ·mm·s -1 0.5deg·mW -1 ·mm·s -1 0.6deg·mW -1 ·mm·s -1 Or 0.7 deg·mW -1 ·mm·s -1 The value in the formula is any value or a range between any two; the above relationship was measured at 25±2°C in air.

[0030] Through the above relationship, the bending angle of indigo organic crystals can be precisely controlled, thereby realizing the directional driving of indigo organic crystals. This can be applied to drive crystals through complex obstacles to reach specific target positions, providing a high spatiotemporal precision technical solution for miniaturized photo-driven machinery and micro-nano robots.

[0031] In some embodiments of the present invention, the organic crystal is strip-shaped.

[0032] In some embodiments of the present invention, the pulsed laser performs a fixed-point scan parallel to the thickness direction of the organic crystal; the thickness of the organic crystal is 0.1~1μm.

[0033] 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.

[0034] The organic crystal used in this invention is thin, which allows the heat energy generated by the pulsed laser to spread rapidly and penetrate the entire organic crystal, forming instantaneous temperature differences in different parts of the organic crystal. This induces an asymmetric stress field, causing the organic crystal to undergo reversible deformation, such as reversible stretching or reversible bending.

[0035] In some embodiments of the present invention, the length of the organic crystal is 1~100 μm.

[0036] Specifically, the length of the organic crystal can be any value of 1μm, 10μm, 20μm, 30μm, 50μm, 70μm or 100μm or a range between any two.

[0037] In some embodiments of the present invention, the width of the organic crystal is 1~10 μm.

[0038] Specifically, the width of the organic crystal can be any value of 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm or 10μm or a range between any two.

[0039] A second aspect of the present invention provides a light-induced device for realizing controllable deformation of an organic crystal, comprising a light source module and a control module; the light source module is used to emit pulsed laser light; the control module is used to control the pulsed laser light to perform fixed-point scanning on the surface of the organic crystal, so that the organic crystal undergoes reversible deformation along the scanning path formed by the fixed-point scanning.

[0040] The third aspect of the present invention provides an application of the photo-inducing method as described in the first aspect of the present invention, or the photo-inducing device as described in the second aspect of the present invention, in the fields of miniaturized photo-driven machinery, micro-nano robots, or flexible optoelectronics.

[0041] The beneficial effects of this invention are as follows: The organic crystal of this invention can efficiently absorb light through a conjugated system, absorbing the light energy of pulsed laser and instantly converting it into localized thermal energy, resulting in lattice thermal expansion. This thermal energy can rapidly penetrate the organic crystal, creating an instantaneous temperature difference. This temperature difference induces an asymmetric stress field, causing the organic crystal to deform along the scanning path. This deformation is reversible; when there is no pulsed laser irradiation, the organic crystal will return to its original state. Specifically, this invention uses a fixed-point laser scanning method to effectively control the direction of crystal bending, with the bending angle precisely controlled within ±0.5°, providing a precise method for controlling crystal bending deformation. Furthermore, the light-induced crystal deformation is completely reversible, maintaining the deformation amplitude and response rate without attenuation even after more than fifty cycles. The light-induced method and device of this invention have wide applications in miniaturized optically driven machinery, micro / nano robots, or flexible optoelectronics. Attached Figure Description

[0042] Figure 1 The diagram shows the principle and experimental results of the method for achieving reversible stretching of organic crystals in Embodiment 1 of the present invention.

[0043] Figure 2 The diagram shows the principle and experimental results of the method for achieving reversible bending of organic crystals in Embodiment 2 of the present invention.

[0044] Figure 3This is an experimental micrograph of the deformation and motion of organic crystals in a microsphere obstacle according to an embodiment of the present invention. Detailed Implementation

[0045] 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.

[0046] 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.

[0047] 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 other organic crystals such as cellulose organic crystals and anthracene derivative organic crystals.

[0048] Preparation Example 1 An organic indigo crystal, the preparation steps of which are as follows: Step 1: Coupling reaction. 6-Bromoindol-2-one (5.00 g, 23.6 mmol) and 6-bromoindigo (5.30 g, 23.6 mmol) were placed in a 100 mL single-necked flask. 80 mL of glacial acetic acid was added to completely dissolve the solid, followed by the dropwise addition of 0.5 mL of concentrated hydrochloric acid. The reaction system was refluxed vigorously in an oil bath at 100 °C for 24 h; during this period, the solution gradually changed from orange-red to deep blue, indicating the formation of 6,6'-dibromoindigo (6-Br-indigo).

[0049] Step 2: Post-processing. After the reaction was complete, the mixture was filtered while hot. The filter cake was washed successively with deionized water (3 × 50 mL), ethanol (2 × 30 mL), and ethyl acetate (2 × 30 mL) until the filtrate was colorless. The resulting deep blue solid was dried under vacuum at 50 °C for 12 h to obtain approximately 8.5 g of indigo microcrystalline powder (yield ≈ 95%, based on 6-bromoindol-2-one).

[0050] Step 3: Microcrystal Dispersion. Place 20 mg of dried indigo microcrystal powder in a 50 mL sample vial, add 50 mL of deionized water, and dropwise add 0.05 wt% SDS (sodium dodecyl sulfate) as a dispersant. After sonication (40 kHz, 100 W, 10 min), a uniform indigo microcrystal suspension is obtained and allowed to stand at room temperature for later use.

[0051] Step 4: Sample Preparation. Apply 0.2 mm thick transparent tape to the surface of a clean glass slide (25 mm × 25 mm) to reduce crystal-substrate adhesion. Draw 10 µL of the suspension using a microsyringe and drop it onto the center of the tape. Allow it to evaporate naturally at room temperature and atmospheric pressure for 30 minutes to obtain monodisperse indigo organic crystals. Crystal dimensions: length 1-100 µm, width 1-10 µm, thickness 0.1-1 µm. These crystals can be directly used in the photoinduced deformation experiments described in the examples below.

[0052] An embodiment of the present invention provides a light-induced device for controlling the deformation of an organic crystal, specifically including a light source module and a control module; the light source module is used to emit pulsed laser; the control module is used to control the pulsed laser to perform fixed-point scanning on the surface of the organic crystal, so that the organic crystal undergoes reversible deformation along the scanning path formed by the fixed-point scanning.

[0053] Specifically, the aforementioned light source module can be a near-infrared Nd:YAG laser with a wavelength of 1064nm and an output power that is continuously adjustable from 0-1W; its beam quality M 2 <1.2, linewidth <0.1nm, to ensure monochromaticity and spatial coherence.

[0054] Specifically, the aforementioned control module can be an acousto-optic deflector (AOD); the emitted laser is passed through the acousto-optic deflector (AOD, center frequency 80MHz, rise time <5µs, angular resolution 0.01°) to achieve two-dimensional high-speed, inertia-free beam scanning; when combined with an f-θ field lens, a flat field scanning range of 50mm×50mm can be obtained on the sample surface, with a positioning error <±2µm.

[0055] In the following embodiments of the present invention, the scanning path is driven by the original "point-chain-loop" three-layer data structure: 1) Point: Each scan point stores x and y coordinates (μm level), dwell time t (µs level), and power P value (mW level); 2) Chain: Several points are connected sequentially to form a chain, and instructions such as loop, delay, and power change can be inserted into the chain; 3) Rings: Multiple chains can be nested into rings to achieve arbitrary periodic or pseudo-random scans.

[0056] Simple paths can be generated with a single click using the accompanying GUI software; complex patterns (such as spirals, fractals, or real-time compensation trajectories based on crystal morphology) need to be written line by line in a blank text file in the format of "x, y, t, P", with the file extension .pts. After importing, the system automatically parses and sends the data to the AOD drive in real time. The scanning frequency is continuously adjustable within the range of 0-100kHz, corresponding to a single-point dwell time of 10µs - ∞, enabling full coverage from "quasi-static point heating" to "high-frequency dynamic scanning".

[0057] Mapping the above path onto indigo microcrystals reveals a weak absorption band at 1064 nm due to π-π* transitions. This absorption of light energy is instantaneously converted into localized heat, leading to lattice thermal expansion. Since the crystal thickness is only 0.1-1 µm, the thermal diffusion length, on the order of microseconds, can penetrate the entire crystal, creating an instantaneous temperature difference ΔT of approximately 10⁻⁵⁰ K between different parts of the crystal. This instantaneous temperature difference induces an asymmetric stress field, causing the crystal to bend reversibly along the scanning direction: if the scanning path is on the left side of the crystal, the crystal bends to the left; conversely, the opposite occurs.

[0058] Example 1 A method for achieving controllable deformation of organic crystals, specifically for realizing reversible stretching and contraction of organic crystals, includes the following steps: Using the center of the left end of the indigo organic crystal as the origin (x, y) = (0, 0), the laser scans from the center of the left end to the center of the right end, meaning x changes from 0 to 14.8 micrometers, while y remains 0. The laser scanning frequency is 10000 Hz, so the single-point dwell time t is 0.0001 s, and the power P is 100 mW. The dimensions of the indigo organic crystal used in this example are: length 14.8 µm, width 3 µm, and thickness 0.5 µm.

[0059] The laser source used above is a near-infrared Nd:YAG laser with a wavelength of 1064nm and an output power that is continuously adjustable from 0-1W, and a beam quality M. 2 The linewidth is <1.2 nm and the peak value is <0.1 nm to ensure monochromaticity and spatial coherence. The emitted laser passes through an acousto-optic deflector (AOD, center frequency 80 MHz, rise time <5 µs, angular resolution 0.01°) to achieve two-dimensional high-speed, inertia-free beam scanning. With the f-θ field lens, a flat field scanning range of 50 mm × 50 mm can be obtained on the sample surface, with a positioning error <±2 µm.

[0060] Figure 1 The diagram shows the principle and experimental results of the method for achieving reversible expansion and contraction of organic crystals in Example 1; where a is the principle diagram and b is the curve showing the change in the expansion and elongation of the organic crystal over time. Figure 1 As can be seen in 'a', the organic crystal undergoes thermal expansion under laser scanning from left to right; from... Figure 1 As shown in b, during the expansion process, the elongation of the organic crystal changes over time; the organic crystal elongates by 3 micrometers within 5 seconds. When the laser is turned off, the organic crystal returns to its original state. This indicates that the light-induced crystal expansion and deformation in Embodiment 1 of this invention is a reversible process, capable of undergoing more than 50 reversible cycles.

[0061] Example 2 A method for achieving controllable deformation of organic crystals, specifically for achieving reversible bending of organic crystals, comprises the following steps: Using the center of the top of the indigo organic crystal as the origin (x, y) = (0, 0), a laser scans from top to bottom. When the organic crystal undergoes a left-side bending deformation, x = -1.5 micrometers; when it undergoes a right-side bending deformation, x = +1.5 micrometers, and y varies from 0 to -10 micrometers. The laser scanning frequency is 10000 Hz, so the single-point dwell time t is 0.0001 s, and the power P is 100 mW. The dimensions of the indigo organic crystal used in this example are: length 15 µm, width 3 µm, and thickness 0.5 µm.

[0062] The laser source used above is a near-infrared Nd:YAG laser with a wavelength of 1064nm and an output power that is continuously adjustable from 0-1W, and a beam quality M. 2 The linewidth is <1.2 nm and the peak value is <0.1 nm to ensure monochromaticity and spatial coherence. The emitted laser passes through an acousto-optic deflector (AOD, center frequency 80 MHz, rise time <5 µs, angular resolution 0.01°) to achieve two-dimensional high-speed, inertia-free beam scanning. With the f-θ field lens, a flat field scanning range of 50 mm × 50 mm can be obtained on the sample surface, with a positioning error <±2 µm.

[0063] Figure 2 The diagrams show the principle and experimental results of the method for achieving reversible bending of organic crystals in Example 2; where a and c are the principle diagram and experimental micrograph of the method for causing left-side bending deformation of the organic crystal, respectively, and b and d are the principle diagram and experimental micrograph of the method for causing right-side bending deformation of the organic crystal, respectively. Figure 2 As shown, by adjusting the scanning path of the laser, the organic crystal can be bent and deformed in different directions; if the scanning path is on the left side of the crystal, the crystal bends to the left; conversely, if the scanning path is on the right side of the crystal, the crystal bends to the right.

[0064] In Example 2, the bending angle θ and the laser power P and scanning speed v satisfy the empirical relationship θ≈k·P / v (k≈0.5deg·mW). -1· mm·s -1· (In an ambient temperature of 25°C). Through real-time closed-loop feedback (camera-image algorithm-laser power linkage), the bending angle can be precisely controlled within ±0.5°, with a cycle life of >50 cycles. This light-induced crystal deformation motion can be applied to drive crystals through complex obstacles to reach specific target positions.

[0065] Using the reversible bending method in Example 2, controllable deformation and movement of organic crystals in microsphere obstacles can be achieved. Figure 3Experimental micrographs showing the deformation motion of an organic crystal within a microsphere obstacle; where a, b, and c represent the deformation of the organic crystal at t=0s, t=5s, and t=10s, respectively. Figure 3 The organic crystals of Indigofera tinctoria have the following dimensions: length 85µm, width 3µm, and thickness 0.5µm. For example... Figure 3 As shown, organic crystals can bend and adjust their direction of motion under the action of lasers and pass through microsphere obstacles, which provides a high spatiotemporal precision technical solution for miniaturized optically driven machinery and micro-nano robots.

[0066] In summary, the organic crystal of this invention can efficiently absorb light through a conjugated system, absorbing the light energy of a pulsed laser and instantly converting it into localized thermal energy, resulting in lattice thermal expansion. This thermal energy can rapidly penetrate the organic crystal, creating an instantaneous temperature difference. This temperature difference induces an asymmetric stress field, causing the organic crystal to deform along the scanning path. This deformation is reversible; when there is no pulsed laser irradiation, the organic crystal will return to its original state. Specifically, the fixed-point laser scanning method of this invention can effectively control the direction of crystal bending, with the bending angle precisely controlled within ±0.5°, providing a precise method for controlling crystal bending deformation. Furthermore, the light-induced crystal deformation is completely reversible, maintaining the deformation amplitude and response rate without attenuation even after more than fifty cycles. The light-induced method and device of this invention have wide applications in miniaturized optically driven machinery, micro / nano robots, or flexible optoelectronics.

Claims

1. A photoinduced method for achieving controllable deformation of organic crystals, characterized in that, The method comprises the following steps: The surface of the organic crystal is subjected to point-by-point scanning by means of a pulsed laser, so that the organic crystal is subjected to controllable deformation along a scanning path formed by the point-by-point scanning.

2. The photo-induced method of claim 1, wherein, The wavelength of the pulsed laser is 780-1100 nm. And / or, the single-point residence time of the pulsed laser is ≥10 µs. And / or, the irradiation power of the pulsed laser is ≤1 W.

3. The photo-induced method of claim 1, wherein, The point-by-point scanning specifically comprises the following steps: establishing a position coordinate axis for a side surface of the organic crystal subjected to the point-by-point scanning, recording coordinate data x and y of a scanning point, and recording single-point residence time t and power value P of the scanning point, and establishing a scanning path with respect to x, y, t and P; and mapping the scanning path with respect to x, y, t and P to the surface of the organic crystal, and performing point-by-point scanning.

4. The photo-induced method of claim 1, wherein, The controllable deformation comprises reversible stretching and contraction, reversible bending or a combination thereof.

5. The photo-induced method of claim 4, wherein, When the scanning path is located on a central axis of the organic crystal, the organic crystal is subjected to reversible stretching and contraction along the central axis; when the scanning path is located on a side of the organic crystal, the organic crystal is subjected to reversible bending along the scanning path.

6. The photo-induced method of claim 5, wherein, The bending angle of the organic crystal subjected to the reversible bending is in a positive proportional relationship with the laser power of the pulsed laser. And / or, the bending angle of the organic crystal subjected to the reversible bending is in an inverse proportional relationship with the scanning speed of the pulsed laser.

7. The photo-induced method of claim 1, wherein, The organic crystal comprises at least one of an indigo organic crystal, a cellulose organic crystal or an anthracene derivative organic crystal.

8. The photo-induced method of claim 1, wherein, The pulsed laser performs point-by-point scanning in a direction parallel to the thickness direction of the organic crystal; and the thickness of the organic crystal is 0.1-1 µm.

9. A photoinducing device for realizing controllable deformation of organic crystals, characterized by comprising: The light source module is configured to emit a pulsed laser, and the control module is configured to control the pulsed laser to perform point-by-point scanning on the surface of the organic crystal, so that the organic crystal is subjected to reversible deformation along a scanning path formed by the point-by-point scanning.

10. Use of the light-induced method according to any one of claims 1-8 or the light-induced device according to claim 9 in the field of micro-sized light-driven machines, micro / nano robots or flexible optoelectronics.

Images