A dimer-based optical manipulation method

Abstract

This invention relates to the field of optical manipulation technology, and more specifically, to a method for optical manipulation based on a dimer. The purpose of this invention is to solve the problem of insufficient lateral optical force control. The dimer is constructed by assembling two isotropic particles, and is placed on a sample stage and completely immersed in a homogeneous medium. The optical manipulation method is as follows: a circularly polarized Gaussian beam is shaped into an incident light with an elliptical cross-section. The incident light is guided to obliquely illuminate the dimer and project an elliptical spot with a major axis and a minor axis onto the substrate of the sample stage. The angle of inclination formed by the incident light and the normal to the substrate of the sample stage is ∈ (0°, 90°), with the major axis perpendicular to the propagation direction of the incident light and the axis of the dimer parallel to the minor axis, so that the incident light induces a lateral optical force on the dimer, the direction of which is parallel to the major axis. By adjusting the rotation direction of the circularly polarized Gaussian beam and the angle of inclination, optical manipulation of the dimer's motion direction and velocity can be achieved.

Description

Technical Field

[0001] This invention relates to the field of optical manipulation technology, and more specifically, to a dimer-based optical manipulation method. Background Technology

[0002] Optical manipulation technology utilizes the optical forces generated by the interaction of light and matter to achieve non-contact control of micro and nanoparticles. Typical optical forces include gradient forces and scattering forces. Gradient forces, stemming from the non-uniformity of light intensity distribution, can be used to stably trap particles at the center of the light field; while scattering forces act along the direction of light propagation and are often used to propel particle motion. Since Arthur Ashkin et al. first used a strongly focused Gaussian beam to stably trap dielectric particles in 1986, optical tweezers technology has developed rapidly and is widely used in high-precision applications such as biomanipulation, microfluidic chips, and nanofabrication. Traditional optical tweezers systems rely on high numerical aperture focusing to generate a strong gradient force field, thereby achieving particle confinement and traction. However, this method mainly operates along the axial direction, with limited lateral (perpendicular to the direction of light propagation) manipulation capabilities.

[0003] To overcome these limitations, researchers have recently focused on how to induce Lateral Optical Force (LOF) through optical field structure design. LOF is a type of asymmetric optical force perpendicular to the direction of incident light propagation, typically generated when structural symmetry is broken or the optical field exhibits lateral inhomogeneity. Studies have shown that generating significant LOF in the far field requires two key conditions: first, the scatterer itself must possess structural or material anisotropy, such as ellipsoidal particles or chiral structures; second, the incident light field must have an asymmetric phase or intensity distribution, such as a vector light field or an orbital angular momentum beam.

[0004] Existing methods for generating LOFs mainly fall into three categories: 1. Utilizing asymmetric particles such as ellipsoids and chiral metallic nanostructures to disrupt system symmetry and achieve transverse component modulation of optical force; 2. Adjusting the local field distribution by introducing interfaces, gradient refractive index media, or photonic crystal structures; 3. Constructing multi-particle systems with periodic or aperiodic arrangements and inducing asymmetric optical force through collective scattering behavior. However, these methods generally suffer from the following problems: complex structural design, demanding fabrication processes, strong dependence on material properties, limited degrees of freedom in control, and difficulty in meeting the requirements of cost, ease of operation, and environmental stability in practical applications.

[0005] Patent document CN110444314B discloses a light manipulation system and method based on graphene structure. Although the method can realize the movement of target particles, the preparation process of core-shell structured graphene particles is complicated and the material cost is high. Secondly, the system mainly relies on longitudinal light force and cannot achieve effective manipulation in the lateral direction, which limits its applicability in multi-dimensional space manipulation scenarios.

[0006] Patent document CN110767344B discloses a light manipulation system and method based on vector light field. This system can effectively manipulate CuO nanoparticles, but the method relies on a variety of high-precision optical components and control mechanisms, which is costly. In addition, the light field needs to be precisely focused and collimated before manipulation, which is cumbersome and difficult to meet the practical application requirements of large-area, dynamic or real-time manipulation. Summary of the Invention

[0007] The present invention aims to overcome at least one of the defects of the prior art and provide a dimer-based optical manipulation method to solve the problem of insufficient lateral optical force control capability.

[0008] This invention provides a light manipulation method based on a dimer, wherein the dimer is formed by assembling two isotropic particles, and the dimer is placed on a sample stage and completely immersed in a homogeneous medium; the method includes the following steps:

[0009] A linearly polarized Gaussian beam is converted into a circularly polarized Gaussian beam using a polarization adjustment component.

[0010] The circularly polarized Gaussian beam is shaped into an incident light with an elliptical cross-section by a beam shaping component. The incident light is then guided by an incident angle adjustment component to obliquely illuminate the dimer and project an elliptical spot with a major axis and a minor axis onto the substrate of the sample stage. The angle of inclination formed by the incident light and the normal to the substrate of the sample stage is ∈ (0°, 90°). The major axis is perpendicular to the propagation direction of the incident light, and the axis of the dimer is parallel to the minor axis, so that the incident light induces a lateral light force on the dimer, and the direction of the lateral light force is parallel to the major axis.

[0011] The rotation direction of the circularly polarized Gaussian beam is controlled by the polarization adjustment component, and the tilt angle is controlled by the incident angle adjustment component, so as to achieve optical manipulation of the movement direction and speed of the dimer.

[0012] In this invention, because the elliptical light spot is expanded along the major axis of the ellipse, the light intensity gradient is weakened, thereby significantly reducing the influence of the gradient force on the dimer along the major axis of the elliptical light spot. Since the axis of the dimer is along the minor axis of the ellipse, when the tilt angle is ∈ (0°, 90°), the scattering process of the incident light breaks the balance of the dimer, and a phase difference is generated between the two isotropic particles constituting the dimer, resulting in a net energy difference in the dimer along the major axis of the ellipse. Thus, the dimer is mainly driven by the lateral light force caused by asymmetric scattering and moves along the major axis of the elliptical light spot. At the same time, the light spot is compressed along the minor axis of the ellipse, the light intensity gradient is enhanced, and a strong confinement potential well is formed, thereby effectively suppressing the offset of the dimer along the minor axis of the ellipse caused by the scattering force, ensuring the stability and controllability of the light manipulation. This invention is based on an isotropic dimer structure and combines asymmetric scattering excited by circularly polarized Gaussian beam incident. By jointly adjusting the polarization adjustment component and the incident angle adjustment component, controllable displacement of the dimer in the direction perpendicular to the incident light propagation direction and its own structural axis can be achieved, which improves the flexibility of lateral light force control and simplifies the control difficulty.

[0013] Furthermore, the isotropic particles are of the same size, and the dimer is a one-dimensional linear dimer.

[0014] This invention ensures that the two isotropic particles of the dimer experience the same force during the process of being driven by lateral light force, and the axis of the dimer always remains parallel to the minor axis of the elliptical light spot, thereby improving the stability and reliability of the dimer as a whole being able to move linearly along the major axis of the elliptical light spot.

[0015] Furthermore, the isotropic particles are polystyrene particles, polymethyl methacrylate particles, or silica particles.

[0016] Furthermore, the radius of the isotropic particles is 100 nm to 10 μm.

[0017] Furthermore, the homogeneous medium is water or air.

[0018] Furthermore, the wavelength of the linearly polarized Gaussian beam is 500~650nm.

[0019] Furthermore, the output optical power of the linearly polarized Gaussian beam is 0.1~10W.

[0020] Furthermore, the polarization adjustment component includes a half-wave plate and a quarter-wave plate arranged coaxially and sequentially.

[0021] Furthermore, the beam shaping assembly includes a cylindrical lens, a first convex lens, and a second convex lens arranged coaxially and sequentially, with the first convex lens and the second convex lens being confocal.

[0022] Furthermore, the incident angle adjustment component includes a reflector disposed between the beam shaping assembly and the sample stage, and the tilt angle of the reflector is adjustable.

[0023] Furthermore, the degree of the tilt angle is ∈ [30°, 50°].

[0024] Studies have shown that by using the tilt angle of the present invention, a larger lateral optical force can be obtained, which enhances the optical force polarity reversal caused by circularly polarized Gaussian beams with different chiralities.

[0025] Furthermore, after controlling the rotation direction of the circularly polarized Gaussian beam through the polarization adjustment component and controlling the tilt angle through the incident angle adjustment component to achieve optical manipulation of the direction and velocity of the dimer's motion, the method further includes:

[0026] The dimer and / or the motion of the dimer under the illumination of the incident light are imaged using an imaging component.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] (1) The optical manipulation method of the present invention only requires two conventional isotropic particles, thus avoiding dependence on complex anisotropic structures or noble metal nanomaterials.

[0029] (2) The present invention can achieve precise control of the direction and magnitude of the lateral light force by adjusting the incident angle and polarization state of the incident light. It has good adaptability and adjustability and can be used in various precision control scenarios such as optical rotating devices, microfluidic drive modules and chiral particle sorting platforms.

[0030] (3) The optical manipulation method of the present invention has good scalability and can be widely applied to various application scenarios such as particle optical manipulation, chiral particle sorting, microfluidic drive and optical rotating devices when combined with other equipment. Attached Figure Description

[0031] Figure 1 This is a structural diagram of the dimer-based optical manipulation system of the present invention.

[0032] Figure 2 This is a flowchart of the light manipulation method based on dimers according to the present invention.

[0033] Figure 3 This is a schematic diagram of the optical manipulation method based on dimers according to the present invention.

[0034] Figure 4 This is a graph showing the variation of the lateral optical force of the dimer in some embodiments of the present invention with different circular polarization states and incident angles.

[0035] Figure reference numerals: 1. Gaussian beam emitting device; 2. Polarization adjustment component; 3. Beam shaping component; 4. Incident angle control component; 5. Dimer; 6. Imaging component; 7. Sample stage. Detailed Implementation

[0036] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the invention. To better illustrate the following embodiments, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions; it is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0037] Furthermore, in this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0039] Example 1

[0040] like Figure 1 As shown, this embodiment first provides an optical manipulation system based on a dimer 5. The optical manipulation system includes, in sequence, a Gaussian beam emitting device 1, a polarization adjustment component 2, a beam shaping component 3, an incident angle control component 4, a dimer 5, and a sample stage 7. The sample stage 7 is loaded with a homogeneous medium, and the dimer 5 is placed on the substrate of the sample stage 7 and completely immersed in the homogeneous medium.

[0041] In practical use, the Gaussian beam emitting device 11 generates linearly polarized Gaussian light, which is then converted into a circularly polarized Gaussian beam with specific chirality by the polarization adjustment component 2. The circularly polarized Gaussian beam with specific chirality is adjusted by the beam shaping component 3 to be incident light with an elliptical cross-section. Under the action of the incident angle control component 4, the incident light is obliquely incident on the dimer 5 on the sample stage 7. The dimer 5 consists of two isotropic particles and is used to generate lateral light force in response to the asymmetric scattering induced by the light field.

[0042] In specific implementation, the polarization adjustment component 2 includes a half-wave plate and a quarter-wave plate arranged coaxially and sequentially in front of the Gaussian beam emitting device 1. The beam shaping component 3 includes a cylindrical lens, a first convex lens, and a second convex lens arranged coaxially and sequentially, with the first convex lens and the second convex lens being confocal.

[0043] In some embodiments, the optical manipulation system further includes an imaging component 6, which is used to observe in real time the motion process and force response of the dimer 5 under incident light irradiation, thereby verifying the manipulation effect and mechanical mechanism.

[0044] Based on the above-mentioned optical manipulation system, the present invention also provides an optical manipulation method based on dimer 5, wherein the dimer 5 is configured as follows: the dimer 5 is formed by assembling two isotropic particles, and the dimer 5 is placed on the sample stage 7 and completely immersed in a homogeneous medium.

[0045] In practice, isotropic particles are spherical particles of the same size and isotropic. Specifically, two isotropic particles are placed on the substrate of the sample stage 7 and arranged in a bonded manner. Under the action of intermolecular forces (such as van der Waals forces), the two isotropic particles assemble to form a one-dimensional linear dimer 5. At this time, the axis of the dimer 5 passes through the contact point of the two particles. When the dimer 5 is placed on the substrate, the line connecting the contact point between the two particles and the substrate is parallel to the axis of the dimer 5. In this way, it is easy to construct a state in which the axis of the dimer 5 is parallel to the minor axis of the elliptical light spot. Furthermore, when the dimer 5 is driven by lateral light force, the two particles experience the same force. Thus, during the linear movement of the dimer 5 as a whole along the major axis of the elliptical light spot, the axis of the dimer 5 always remains parallel to the minor axis of the elliptical light spot, improving the stability and reliability of light manipulation. It should be noted that the axis of dimer 5 refers to the straight line connecting the centers of the two isotropic particles constituting dimer 5, which is a line along the maximum extension direction of dimer 5.

[0046] In specific implementations, the isotropic particles are selected from polystyrene particles, polymethyl methacrylate particles, or silica particles. It is understood that the dimer is confined to the range of an elliptical light spot; therefore, the lengths of the major and minor axes of the elliptical light spot determine the size of the manipulated dimer and the isotropic particles. The size of the elliptical light spot can be adjusted according to actual needs using a beam shaping component. Tests of this invention show that the optical manipulation effect is better when the radius of the isotropic particles is between 100 nm and 10 μm. In some specific embodiments of this invention, the isotropic particles are specifically made of polystyrene material with a radius of 500 nm.

[0047] Furthermore, the homogeneous medium can be deionized water or air. It is understood that when air is used as the homogeneous medium, the buoyancy exerted by air on the dimer 5 is relatively small, resulting in significant friction between the dimer 5 and the substrate of the sample stage 7. In this case, a higher power incident light is required to drive the dimer 5. Therefore, in a preferred embodiment, deionized water is used as the homogeneous medium. When the dimer 5 is completely immersed in deionized water, the deionized water provides a certain amount of buoyancy to the dimer 5, thereby reducing the friction between the dimer 5 and the substrate of the sample stage 7. Thus, a smaller light power can induce lateral light force on the dimer 5.

[0048] refer to Figure 2 The light manipulation method based on dimer 5 includes the following steps:

[0049] S1. Convert the linearly polarized Gaussian beam into a circularly polarized Gaussian beam using polarization adjustment component 2;

[0050] S2. The circularly polarized Gaussian beam is shaped into an incident light with an elliptical cross-section by the beam shaping component 3. The incident light is guided by the incident angle adjustment component to obliquely irradiate the dimer 5 and project an elliptical spot with a major axis and a minor axis onto the substrate of the sample stage 7. The degree of the tilt angle formed by the incident light and the normal of the substrate of the sample stage 7 is ∈ (0°, 90°). The major axis of the elliptical spot is perpendicular to the propagation direction of the incident light, and the axis of the dimer 5 is parallel to the minor axis of the elliptical spot, so that the incident light induces a lateral light force on the dimer 5. The direction of the lateral light force is parallel to the major axis of the elliptical spot.

[0051] S3. The rotation direction of the circularly polarized Gaussian beam is controlled by the polarization adjustment component 2, and the tilt angle is controlled by the incident angle adjustment component, so as to realize optical manipulation of the movement direction and speed of the dimer 5.

[0052] In order to monitor the optical manipulation process, in some embodiments, the optical manipulation method further includes, after step S3:

[0053] Step S4. Imaging the dimer 5 and its motion under the incident light using the imaging component 6. It can be understood that the imaging component 6 records the force response and motion behavior of the dimer 5 after being irradiated by a circularly polarized Gaussian beam, thereby monitoring the lateral force (F) generated under different incident angles and polarization chiral conditions. y The changing trend can be used to verify the control effect and mechanical mechanism.

[0054] It is understandable that, due to the dispersion of the medium, the refractive index of the dimer will differ even when placed in the same medium, even if irradiated with different wavelengths. The refractive index affects the intensity of light, so wavelength affects the intensity of light; this effect is non-linear. Similarly, optical power also affects the intensity of light; higher power results in greater intensity and higher particle velocity; this effect is linear. Tests conducted in this invention show that in step S1, when the wavelength of the linearly polarized Gaussian beam is 500-650 nm and the output optical power is 0.1-10 W, the optical manipulation effect of the dimer is better.

[0055] In some specific embodiments of the present invention, a continuous laser with a wavelength of 532 nm is used as the Gaussian beam emitting device 1, and the output power is set to 0.1~3W. Furthermore, this circularly polarized Gaussian beam can actually be converted into a left-handed or right-handed circularly polarized Gaussian beam by the polarization adjustment component 2.

[0056] In step S2, to optimize the light manipulation effect, the beam shaping component 3 not only shapes the circularly polarized Gaussian beam of a specific chirality into a beam with an elliptical cross-section, but also expands the beam to improve the illumination range and illumination uniformity. Furthermore, for ease of understanding, this invention uses the tilt angle formed by the incident light and the normal to the substrate of the sample stage 7 as the incident angle of the incident light.

[0057] In step S3, the polarization adjustment component 2 controls the rotation direction of the circularly polarized Gaussian beam to be left-handed or right-handed, and the incident angle adjustment component controls the tilt angle to be within the range of (0°, 90°).

[0058] For ease of understanding, please refer to Figure 3 This embodiment uses a three-dimensional coordinate system to describe the directions involved in the invention. Specifically, the x-axis, y-axis, and z-axis are perpendicular to each other. The xy-plane is parallel to the plane where the sample stage 7 is located, and the z-axis is the normal to the plane where the sample stage 7 is located. The major axis of the elliptical spot is along the y-axis, the minor axis is along the x-axis, and the axis of the dimer 5 is along the x-axis. At this time, the structure of the dimer 5 is equivalent to being mirror-symmetric about the xz-plane.

[0059] In practice, the linearly polarized Gaussian beam is converted into a circularly polarized Gaussian beam and further shaped into an elliptical spot. The projection of the elliptical spot onto the xy-plane has its major axis along the y-axis and its minor axis along the x-axis. This allows control over the distribution of optical force in different directions: the expanded y-direction reduces the gradient force along that axis, making the dimer 5 primarily driven by lateral optical force induced by light scattering in that direction; while the contracted x-direction enhances the gradient field, effectively confining the dimer 5 to the center of that direction and suppressing undesirable motion caused by scattering forces in the x-direction. Specifically, the incident light is incident on the dimer 5 in the xz-plane at an angle θ. When the incident angle is 0° or 90°, the light scattering momentum cancels each other out in the y-axis direction, and the lateral optical momentum is conserved, thus no net lateral optical force is generated. However, under other incident angle conditions, i.e., when the degree of the angle θ ∈ (0°, 90°), the scattering process breaks the mirror symmetry, forming a net momentum difference in the y-direction, inducing a significant lateral optical force F. y The generation mechanism of the lateral optical force originates from the phase difference between the obliquely incident circularly polarized Gaussian beam and different particles, which leads to the breaking of the symmetry of the scattered field about the mirror symmetry plane (such as the xz plane), thereby inducing a net optical momentum exchange along the y direction and realizing the output of lateral optical force.

[0060] In some specific embodiments of the present invention, a circularly polarized Gaussian beam with an incident wavelength of 532 nm is used to irradiate the dimer 5, which is composed of two polystyrene particles with a radius of 500 nm assembled together. Figure 4 The lateral light force F produced under different polarization chirality is shown. y The curve showing the relationship between the incident angle θ and the incident angle. Figure 4 In the figure, the black curve represents the photodynamic response under the action of a left-handed circularly polarized Gaussian beam, and the gray curve represents the corresponding result under the action of a right-handed circularly polarized Gaussian beam. The test results show that, within the incident angle range of 0° to 90°, the photodynamic directions under the two chiral conditions are opposite, exhibiting a significant chiral dependence; especially in the incident angle range of 30° to 50°, the lateral photodynamic force F y Upon reaching its peak, the polarity reversal of the optical force caused by left and right chirality is particularly pronounced, verifying the effectiveness and adjustability of reversible lateral manipulation achieved by jointly controlling the polarization state and incident angle in this invention. This confirms that the invention can achieve precise dual-parameter control of the direction and magnitude of the lateral optical force by adjusting the incident angle and polarization state of the incident light. This characteristic gives the motion behavior of the dimer 5 structure good responsiveness and programmability.

[0061] In summary, the optical manipulation method proposed in this invention can achieve reversible control of the lateral optical force direction by jointly adjusting the chirality and incident angle of a circularly polarized Gaussian beam. This mechanism provides a theoretical basis and experimental support for constructing optically driven micro- and nano-scale manipulation devices and for applications such as optical chiral sorting.

[0062] The optical manipulation strategy proposed in this invention does not require the introduction of complex structures, chiral materials, or high-precision focusing devices. Far-field lateral manipulation can be achieved simply by constructing structural units using spherical particles, demonstrating good versatility and feasibility. Furthermore, the optical manipulation method of this invention has good scalability and can be widely applied to various application scenarios such as particle optical manipulation, chiral particle sorting, microfluidic actuation, and optical rotating devices.

[0063] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the technical solution of the present invention, and are not intended to limit the specific implementation of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of the present invention should be included within the protection scope of the claims of the present invention.

Claims

1. A method of light manipulation based on dimers, characterized in that, The dimmer is assembled by two isotropic particles, and is placed on a sample stage and fully immersed in a uniform medium; The method comprises the following steps: The linearly polarized Gaussian light beam is converted into a circularly polarized Gaussian light beam by a polarization adjusting assembly; The circularly polarized Gaussian light beam is shaped into an incident light with an elliptical cross section by a beam shaping assembly, and the incident light is guided to obliquely irradiate the dimmer and project an elliptical light spot with a major axis and a minor axis on the base of the sample stage by an incident angle adjusting component, wherein the incident light forms an oblique angle with the normal of the base of the sample stage, the major axis is perpendicular to the propagation direction of the incident light, the axis of the dimmer is parallel to the minor axis, so that the incident light induces a lateral optical force on the dimmer, and the direction of the lateral optical force is parallel to the major axis; The rotation direction of the circularly polarized Gaussian light beam is regulated by the polarization adjusting assembly, and the degree of the oblique angle is regulated by the incident angle adjusting component, so as to realize optical manipulation of the movement direction and speed of the dimmer.

2. The method of claim 1, wherein, The isotropic particles are of the same size, and the dimmer is a one-dimensional linear dimmer.

3. The method of claim 1, wherein, The isotropic particles are polystyrene particles, polymethyl methacrylate particles or silica particles.

4. The method of claim 1, wherein, The radius of the isotropic particles is 100 nm to 10 μm.

5. The method of claim 1, wherein, The uniform medium is water or air.

6. The method according to any one of claims 1 to 5, characterized in that, The wavelength of the linearly polarized Gaussian light beam is 500 nm to 650 nm; and / or, The output optical power of the linearly polarized Gaussian light beam is 0.1 W to 10 W.

7. The method according to any one of claims 1 to 5, characterized in that, The polarization adjusting assembly comprises a half-wave plate and a quarter-wave plate arranged coaxially and sequentially from front to back.

8. The method according to any one of claims 1 to 5, characterized in that, The beam shaping assembly comprises a cylindrical lens, a first convex lens and a second convex lens arranged coaxially and sequentially from front to back, and the first convex lens and the second convex lens are arranged in focus; and / or, The incident angle adjusting component comprises a mirror arranged between the beam shaping assembly and the sample stage, and the oblique angle of the mirror is adjustable.

9. The method according to any one of claims 1 to 5, characterized in that, The degree of the oblique angle is [30°, 50°].

10. The method according to any one of claims 1 to 5, characterized in that, After the rotation direction of the circularly polarized Gaussian light beam is regulated by the polarization adjusting assembly, and the degree of the oblique angle is regulated by the incident angle adjusting component, so as to realize optical manipulation of the movement direction and speed of the dimmer, the method further comprises: The dimmer and / or the movement process of the dimmer under the irradiation of the incident light is imaged by an imaging assembly.

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