Liquid crystal device-based optical tweezer experimental teaching and scientific research device

Abstract

The application relates to a liquid crystal device-based optical tweezers device for experimental teaching and scientific research, which comprises an optical component support frame and a light source module, a beam expansion module, a polarization control module, a wavefront modulation module, a beam contraction module, a focusing module, a sample adjustment module, a microscopic module and a monitoring and recording module which are installed on the optical component support frame; the wavefront modulation module comprises a second adjustable diaphragm (501), a patterned orientation liquid crystal wave plate (502) and a liquid crystal wave plate adjustment frame (503), the second adjustable diaphragm (501) and the liquid crystal wave plate adjustment frame (503) are movably arranged on the optical component support frame, the patterned orientation liquid crystal wave plate (502) is arranged on the liquid crystal wave plate adjustment frame (503), and the patterned orientation liquid crystal wave plate (502) has a patterned orientation. Compared with the prior art, the application meets the needs of optical tweezers experimental teaching and scientific research, has strong operability and strong intuitiveness, and has a compact structure.

Description

Technical Field

[0001] This invention relates to the field of optical technology, and in particular to an optical tweezers device based on a liquid crystal device for experimental teaching and scientific research. Background Technology

[0002] Optical tweezers, also known as single-beam gradient force optical traps, are different from everyday tweezers used to hold objects. Optical tweezers, used to capture tiny particles, utilize a special light field. When this field interacts with an object, the object is affected by the light, resulting in a clamping effect. The object can then be moved by shifting the beam. If a region a few micrometers in diameter is defined around the center of the light field, photons entering this restricted area will automatically and rapidly fall back to the center, demonstrating a gravitational effect. If the particles captured by the optical tweezers are likened to glass beads falling into a bowl, then the optical tweezers resemble a trap. This special light field creates a region of low potential energy; a potential barrier exists between this region and the outside. When the object's kinetic energy is insufficient to overcome this barrier, the particle will remain trapped, ultimately exhibiting the effect of the object following a specific path under the influence of the optical tweezers. Furthermore, when a beam of light is focused after passing through a patterned liquid crystal waveplate with a topological charge, the vortex beam carrying orbital angular momentum due to the geometric phase of the liquid crystal waveplate can induce specific motion of microscopic particles around an axis.

[0003] Existing commercial optical tweezers are designed for safety and portability, with a compact structure and encapsulated in a protective shell. This makes it difficult for students to understand the working principle of commercial optical tweezers, resulting in poor intuitiveness. Most of the components of the optical tweezers are pre-designed, making them difficult to operate. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an optical tweezers device based on liquid crystal devices for experimental teaching and scientific research.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] An optical tweezers device based on a liquid crystal device for experimental teaching and scientific research includes an optical component support frame and a light source module, a beam expander module, a polarization control module, a wavefront modulation module, a beam shrinker module, a focusing module, a sample adjustment module, a microscopy module, and a monitoring and recording module mounted on the optical component support frame.

[0007] The wavefront modulation module includes a second adjustable aperture, a patterned liquid crystal waveplate, and a liquid crystal waveplate adjustment frame. The second adjustable aperture and the liquid crystal waveplate adjustment frame are movably mounted on the optical component support frame, and the patterned liquid crystal waveplate is mounted on the liquid crystal waveplate adjustment frame.

[0008] Furthermore, the optical component support frame includes an optical breadboard and a vertical bracket. The vertical bracket is vertically mounted on the optical breadboard. Several sliding bases are movably mounted on the vertical bracket along the normal direction of the optical breadboard. Each sliding base includes a mounting slider, a support sleeve, and a support rod. The mounting slider is movably mounted on the vertical bracket. The support sleeve is vertically fixed on the mounting slider. The support rod is coaxially inserted into the support sleeve.

[0009] Furthermore, the optical component support frame also includes two mirrors, each mirror being fixed to one of the sliding bases via a mirror holder. The two mirrors are symmetrically arranged about the vertical support. The light source module, beam expander module, polarization control module, and one of the mirrors are located on the same side of the vertical support. The wavefront modulation module, beam reducer module, focusing module, sample adjustment module, microscopy module, monitoring and recording module, and the other mirror are located on the same side of the vertical support.

[0010] Furthermore, the light source module includes a solid-state laser, a first adjustable aperture, and an adjustable optical attenuator, which are sequentially and movably mounted on the optical component support frame.

[0011] Furthermore, the polarization control module includes a signal voltage output device and a linear polarizer, an electrically controlled liquid crystal waveplate, and a quarter-wave plate movably mounted on the optical component support frame. The signal voltage output device is mounted on the optical component support frame and electrically connected to the electrically controlled liquid crystal waveplate. The number of electrically controlled liquid crystal waveplates is one or more, and the number of quarter-wave plates is one or more.

[0012] Furthermore, the beam expander module includes two first lens groups with different focal lengths, and the beam expander module is movably mounted on the optical component support frame;

[0013] The beam-shrinking module includes two second lens groups with different focal lengths, and the beam-shrinking module is movably mounted on the optical component support frame.

[0014] Furthermore, the focusing module includes a right-angle optical adjustment frame, a first beam splitter, a first objective lens, and an objective lens fine-tuning frame. The right-angle optical adjustment frame and the objective lens fine-tuning frame are movably mounted on the optical component support frame. The first beam splitter is mounted on the right-angle optical adjustment frame, and the first objective lens is mounted on the objective lens fine-tuning frame.

[0015] Furthermore, the sample adjustment module includes a sample holder, a three-axis fine-tuning platform, and a microparticle sample. The three-axis fine-tuning platform is movably mounted on the optical component support frame, the sample holder is mounted on the three-axis fine-tuning platform, and the microparticle sample is mounted on the sample holder.

[0016] Furthermore, the microscope module includes a second objective lens, an eyepiece, an illumination device, a column, a microscope adjustment frame, a microscope tube, and color filters. The column is mounted on an optical component support frame, the microscope adjustment frame is movably mounted on the column, the microscope tube is mounted on the microscope adjustment frame, one end of the microscope tube is connected to the second objective lens, and the other end is connected to the eyepiece. The color filters are mounted on the second objective lens, and the illumination device is mounted on the microscope tube.

[0017] Furthermore, the monitoring and recording module includes a first monitoring camera, a protective film, a computer, and a second monitoring camera. The first and second monitoring cameras are electrically connected to the computer. The first monitoring camera is mounted on the focusing module, the protective film is mounted on the first monitoring camera, and the second monitoring camera is mounted on the microscopy module.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) The sample adjustment module of the present invention is used to place the sample, the light source module generates the light beam, the beam expansion module amplifies the light beam, the polarization control module generates the light beam in various polarization states, the wavefront modulation module uses the principle of liquid crystal geometric phase to modulate the wavefront of the light beam, the beam shrinking module shrinks the light beam, the focusing module is used to focus the light beam carrying a specific phase onto the sample, and is used to amplify the particle sample, the monitoring and recording module monitors and records the specific movement of the sample particles in real time, the wavefront modulation module uses a patterned liquid crystal waveplate with patterned orientation to perform wavefront modulation on the light beam, so that the light beam carries a geometric phase, and then captures the particles after the light beam is focused, and realizes the specific movement of the particles under the drive of the geometric phase of the light beam. This method fully meets the needs of optical tweezers experiment teaching and scientific research, is highly operable, has a compact structure, high efficiency, and the optical tweezers device has a simple structure and low cost.

[0020] (2) The optical tweezers device of the present invention has an intuitive optical design, an easy-to-understand working principle, and an easy-to-operate space for students to conduct hands-on experiments. It is suitable for students of different age groups and has a very significant advantage in stimulating students' interest in physics learning, cultivating students' spirit of exploration, and improving students' scientific literacy. While taking into account the applicability of scientific research, it focuses on cultivating students' abilities and stimulating their interests, and truly brings the cutting edge of science and technology in the world to students at zero distance. It broadens students' horizons and improves their hands-on experimental skills.

[0021] (3) The optical component support frame of the present invention includes an optical breadboard and a vertical support mirror. The vertical support is vertically set on the optical breadboard. Several sliding bases are movably set on the vertical support along the normal direction of the optical breadboard. Each sliding base includes a mounting slider, a support sleeve and a support rod. The mounting slider is movably set on the vertical support. The support sleeve is vertically fixed on the mounting slider. The support rod is coaxially inserted into the support sleeve. The vertical height, horizontal position and tilt angle of the optical component can be flexibly adjusted. Each optical component can be adjusted and disassembled individually. It has strong operability and flexibility and is suitable for optical tweezers experiment teaching and scientific research.

[0022] (4) The light source module, beam expansion module, polarization control module and one of the reflectors of the present invention are located on the same side of the vertical support. The wavefront modulation module, beam contraction module, focusing module, sample adjustment module, microscopy module, monitoring and recording module and another reflector are located on the same side of the vertical support. The light beam emitted by the optical component on one side of the vertical support is reflected by the two reflectors and then incident on the optical component on the other side of the vertical support. Multiple optical components are arranged on both sides of the vertical support and the optical path is connected by the two reflectors, which extends the designed optical path and makes the structure compact.

[0023] (5) The polarization control module of the present invention includes a signal voltage output device and a linear polarizer, an electrically controlled liquid crystal waveplate and a quarter-wave plate movably mounted on the optical component support frame. The signal voltage output device is mounted on the optical component support frame and electrically connected to the electrically controlled liquid crystal waveplate. The number of electrically controlled liquid crystal waveplates is one or more, and the number of quarter-wave plates is one or more. The electrically controlled liquid crystal waveplate and the quarter-wave plate are used together to switch the polarization state, including switching between circularly polarized light, elliptical polarized light and linearly polarized light, as well as switching between left-hand circularly polarized light and right-hand circularly polarized light. The operation is simple.

[0024] (6) The sample adjustment module of the present invention includes a sample holder, a three-axis fine-tuning platform and a particulate sample. The three-axis fine-tuning platform is movably mounted on a vertical support via a sliding base. The sample holder is mounted on the three-axis fine-tuning platform and the particulate sample is mounted on the sample holder. The three-axis fine-tuning platform can fine-tune the position of the particulate sample in three mutually orthogonal directions in space, which is highly flexible.

[0025] (7) The first monitoring camera of the present invention is located on the focusing module and is used to monitor and record the focusing situation and the movement of particles in the particle sample in real time. After the objective lens and eyepiece in the microscopic module magnify the image of the particle sample, it is collected and recorded by the second monitoring camera, realizing the real-time monitoring and recording of the movement of particles in the particle sample. The image is displayed on a computer, with a high level of automation and simple operation. Attached Figure Description

[0026] Figure 1This is a schematic diagram of the device structure of the present invention;

[0027] Figure 2 This is a side view of a right-angle optical adjustment frame;

[0028] Figure 3 Liquid crystal director distribution diagram of a Q-wave plate (Q=5) with uniform spiral phase distribution;

[0029] Figure 4 The liquid crystal director distribution diagram of a Q-wave plate with a non-uniform spiral phase distribution;

[0030] Explanation of the labels in the diagram:

[0031] 101. Optical breadboard; 102. Vertical bracket; 103. Mounting slider; 104. Support sleeve; 105. Support rod; 106. Mirror holder; 107. Mirror; 201. Solid-state laser; 202. First adjustable aperture; 203. Adjustable optical attenuator; 204. Laser beam; 301. First lens group; 401. Linear polarizer; 402. First electro-controlled liquid crystal waveplate; 403. First quarter-wave plate; 404. Second quarter-wave plate; 405. Second electro-controlled liquid crystal waveplate; 406. Signal voltage output device; 501. Second adjustable aperture; 502. Patterned orientation. 503. Liquid crystal waveplate; 601. Second lens group; 701. Right-angle optical adjustment frame; 702. Beam splitter; 703. First objective lens; 704. Objective lens fine-tuning frame; 801. Sample holder; 802. Three-axis fine-tuning platform; 803. Microparticle sample; 901. Second objective lens; 902. Eyepiece; 903. Illumination source; 904. Column; 905. Microscope adjustment frame; 906. Microscope tube; 907. Color filter; 908. Beam splitter; 1001. First monitoring camera; 1002. Protective film; 1003. Computer; 1004. Second monitoring camera. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0033] Example 1

[0034] An optical tweezers device based on liquid crystal devices for experimental teaching and scientific research, such as Figure 1 It includes an optical component support frame and a light source module, beam expander module, polarization control module, wavefront modulation module, beam reducer module, focusing module, sample adjustment module, microscopy module, and monitoring and recording module mounted on the optical component support frame.

[0035] The optical component support frame includes an optical breadboard 101 and a vertical support 102. The vertical support 102 is vertically mounted on the optical breadboard 101. Several sliding bases are movably mounted on the vertical support 102 along the normal direction of the optical breadboard 101. There are two reflectors 107. Each reflector 107 is fixed to one of the sliding bases by a reflector bracket 106. The two reflectors 107 are symmetrically arranged about the vertical support 102.

[0036] The vertical support 102 can be an optical guide rail, a support with magnetic attraction, or a support with fixing holes. Each sliding base includes a mounting slider 103, a support sleeve 104, and a support rod 105. The mounting slider 103 is movably mounted on the vertical support 102. The support sleeve 104 is vertically fixed on the mounting slider 103. The support rod 105 is coaxially inserted into the support sleeve 104 to achieve a telescopic function. The height of the optical component and the distance between it and the vertical support 102 can be adjusted by sliding the base.

[0037] The light source module includes a solid-state laser 201, a first adjustable aperture 202, and an adjustable light attenuator 203, which are sequentially and movably mounted on a vertical support 102. Each optical component in the light source module corresponds to a sliding base. The adjustable light attenuator 203 is used to adjust the light intensity. If the power of the solid-state laser 201 itself is adjustable, then the adjustable light attenuator 203 is not required. If necessary, a pinhole filter can also be set to improve the beam quality. If the beam quality generated by the light source is acceptable, then the pinhole filter is not required. In this embodiment, the beam quality generated by the solid-state laser 201 is acceptable, so the pinhole filter is not required.

[0038] The beam expander module is used to amplify the laser beam and includes two first lens groups 301 with different focal lengths. The beam expander module is movably mounted on the vertical support 102 via a sliding base. The magnification of the first lens group 301 is 2 to 10 times.

[0039] The polarization control module can generate light in various polarization states, including left-hand circularly polarized light, right-hand circularly polarized light, linearly polarized light with controllable polarization direction, and elliptically polarized light. The polarization control module includes a signal voltage output device 406 and a linear polarizer 401, a first electrically controlled liquid crystal waveplate 402, a first quarter-wave plate 403, a second quarter-wave plate 404, and a second electrically controlled liquid crystal waveplate 405, which are sequentially and movably arranged on the vertical support 102. The signal voltage output device 406 is located on the optical breadboard 101 and is electrically connected to the second electrically controlled liquid crystal waveplate 405.

[0040] The operating wavelength of the quarter-wave plate is the same as the wavelength of the light generated by the light source module;

[0041] Each electro-controlled liquid crystal waveplate has a uniform liquid crystal orientation, i.e. a clear optical axis direction, and a layer of transparent conductive electrodes on the substrate of the electro-controlled liquid crystal waveplate. When the electro-controlled liquid crystal waveplate is used in conjunction with a quarter-wave plate, the polarization state can be changed by using a suitable signal voltage, including the interconversion between circularly polarized light, elliptically polarized light and linearly polarized light, as well as the switching between left-hand circularly polarized light and right-hand circularly polarized light.

[0042] The signal voltage output device 406 has a multi-output function, which controls each electronically controlled liquid crystal waveplate separately, and the AC voltage regulation range is 0-20 volts.

[0043] The wavefront modulation module utilizes the principle of liquid crystal geometric phase to modulate the wavefront of the beam. It includes a second adjustable aperture 501, a patterned liquid crystal waveplate 502, and a liquid crystal waveplate adjustment frame 503. The second adjustable aperture 501 and the liquid crystal waveplate adjustment frame 503 are movably mounted on a sliding base. The liquid crystal waveplate adjustment frame 503 holds the patterned liquid crystal waveplate 502 and can finely adjust the position of the patterned liquid crystal waveplate 502 in any two mutually perpendicular directions in the horizontal plane.

[0044] The number of patterned alignment liquid crystal waveplates 502 is one or more. In this embodiment, the number of patterned alignment liquid crystal waveplates 502 is one.

[0045] Geometric phase is a special phase that is independent of optical path, unlike dynamic propagation phase. It is only related to the geometric shape of the anisotropic medium along the path of light. The patterned orientation liquid crystal waveplate 502 has a patterned orientation. The patterned orientation liquid crystal waveplate 502 can be a passive liquid crystal element made of liquid crystal polymer, that is, the substrate of the liquid crystal waveplate does not need a transparent conductive electrode. It can also be an active electrically controlled liquid crystal waveplate with patterned orientation, that is, the substrate of the liquid crystal waveplate has a layer of transparent conductive electrode. The patterned orientation liquid crystal waveplate 502 has the advantages of compact structure and high efficiency. By using the patterned orientation liquid crystal waveplate 502 to perform wavefront modulation on the light beam, the light beam carries the geometric phase. After the light beam is focused, the particles are captured. Under the drive of the geometric phase of the light beam, the specific movement of the particles is realized. This method fully meets the needs of optical tweezers experimental teaching and scientific research. The optical tweezers device has the advantages of simple structure, economy and practicality, and strong operability for students.

[0046] Patterned orientation can be a typical Q-waveplate pattern exhibiting a uniform spiral phase distribution, where the topological charge Q is uniquely determined, such as... Figure 3As shown, when left-handed or right-handed circularly polarized light passes through a patterned liquid crystal waveplate and is focused onto a microparticle by a focusing module, the microparticle can achieve cyclic rotation along the annular beam in either a clockwise or counterclockwise direction. The patterned orientation can also be a special Q-waveplate pattern exhibiting a non-uniform spiral phase distribution, where the topological charge Q varies with the azimuth angle, such as... Figure 4 As shown, when left-handed or right-handed circularly polarized light passes through a patterned liquid crystal waveplate and is focused onto a microparticle by a focusing module, the microparticle can move clockwise or counterclockwise along the spiral beam and be absorbed or ejected by the beam. The patterned orientation can also be a grating structure pattern, a lens structure pattern, an Airy beam generation structure pattern, or other holographic patterns, used to achieve corresponding microparticle manipulation.

[0047] The beam shrinking module is used to reduce the laser beam and includes two second lens groups 601 with different focal lengths. The beam shrinking module is movably mounted on the vertical support 102 via a sliding base. The reduction ratio of the beam shrinking module is 2 to 10 times.

[0048] like Figure 2 The focusing module is used to focus a beam carrying a specific phase onto the sample. It includes a right-angle optical adjustment frame 701, a first beam splitter 702, a first objective lens 703, and an objective lens fine adjustment frame 704. The right-angle optical adjustment frame 701 and the objective lens fine adjustment frame 704 are movably mounted on the optical component support frame. The first beam splitter 702 is mounted on the right-angle optical adjustment frame 701. The first beam splitter 702 is a beam splitter or a beam splitter prism. The first objective lens 703 is mounted on the objective lens fine adjustment frame 704.

[0049] The sample adjustment module includes a sample holder 801, a three-axis fine-tuning platform 802, and a particulate sample 803. The three-axis fine-tuning platform 802 is movably mounted on the vertical support 102 via a sliding base. The sample holder 801 is mounted on the three-axis fine-tuning platform 802, and the particulate sample 803 is mounted on the sample holder 801. The three-axis fine-tuning platform 802 can fine-tune the position of the particulate sample 803 in three mutually orthogonal directions in space.

[0050] The microscope module is used to magnify particulate sample 803 and includes a second objective lens 901, an eyepiece 902, an illumination device, a column 904, a microscope adjustment frame 905, a microscope tube 906, and a color filter 907. The column 904 is mounted on an optical component support frame, the microscope adjustment frame 905 is movably mounted on the column 904, the microscope tube 906 is mounted on the microscope adjustment frame 905, one end of the microscope tube 906 is connected to the second objective lens 901, and the other end is connected to the eyepiece 902. The color filter 907 is mounted on the second objective lens 901.

[0051] The illumination device includes an illumination source 903 and a second beam splitter 908. The illumination source 903 and the second beam splitter 908 are mounted on the microscope tube 906. The second beam splitter 908 is a beam splitter lens. The angle between the second beam splitter 908 and the horizontal direction is 45°. The illumination source 903 emits light in the horizontal direction. After being reflected by the second beam splitter 908, the light source illuminates the particulate sample 803 through the second objective lens 901.

[0052] The lighting equipment can also be a ring-shaped shadowless lamp, which is installed between the particulate sample 803 and the microscopic module;

[0053] The second objective 901 can be a 10-100x microscope objective or a 100x oil immersion lens. The position of the second objective 901 can be finely adjusted in any two mutually perpendicular directions in the horizontal plane.

[0054] If the magnification of the second objective lens 901 is appropriate, the eyepiece 902 may not be necessary. If the laser is too strong, a color filter 907 can be placed in front of the microscope module to block most of the laser from passing through, thereby protecting the microscope module and the monitoring and recording module.

[0055] The monitoring and recording module is used to monitor and record the movement of particles in the particulate sample 803 in real time. It includes a first monitoring camera 1001, a protective film 1002, a computer 1003, and a second monitoring camera 1004. Both the first monitoring camera 1001 and the second monitoring camera 1004 are connected to memory cards. The first monitoring camera 1001 and the second monitoring camera 1004 are electrically connected to the computer 1003. The first monitoring camera 1001 is mounted on a right-angle optical adjustment frame 701 and receives the laser reflected from the particulate sample 803 and the transmitted light from the particulate sample 803 under the illumination source 903. It monitors and records the focusing status and the movement of particles in the particulate sample 803 in real time. The protective film 1002 is mounted on the first monitoring camera 1001. The protective film 1002 is a 25% light attenuation film or a color filter to prevent the laser from being too strong and damaging the camera's photosensitive components. The second monitoring camera 1004 is mounted on the microscope module and is used to monitor and record the movement of particles in the particulate sample 803 in real time.

[0056] The first surveillance camera 1001 is a CCD or CMOS camera, and the second surveillance camera 1004 is a CCD or CMOS camera.

[0057] After the beam passes through the patterned liquid crystal waveplate 502 and carries a specific phase, the beam splitting interface of the first beam splitter 702 forms an angle of 45° with the horizontal direction, splitting the vertical beam into two beams: a vertically transmitted beam and a horizontal beam reflected by the first beam splitter 702. The horizontal beam can be used to assist in indicating the optimal position of the patterned liquid crystal waveplate 502 when fine-tuning its horizontal position, or it can be blocked by a baffle to protect non-users passing by the device. After the vertically transmitted beam is focused onto the particle sample 803 by the second objective lens 901, a portion of it is reflected by the particle sample 803, and after passing through the second objective lens 901, it is reflected again by the first beam splitter 702 in the opposite horizontal direction to the previous horizontal beam, and is received by the first monitoring camera 1001 of the monitoring and recording module. If the laser is too strong, a protective sheet 1002 can be placed in front of the camera lens of the first monitoring camera 1001 to prevent the laser from damaging the camera's photosensitive components.

[0058] Example 2

[0059] In this embodiment, as Figure 1 The optical component support frame also includes two reflectors 107 located at the top of the vertical bracket 102. Each reflector 107 is fixed to one of the sliding bases by a reflector frame 106. The two reflectors 107 are symmetrically arranged about the vertical bracket 102.

[0060] If the optical path is long, multiple optical components are divided into two parts. The light source module, beam expander module, polarization control module, and one of the reflectors 107 are located on the same side of the vertical support 102. The wavefront modulation module, beam reducer module, focusing module, sample adjustment module, microscopy module, monitoring and recording module, and the other reflector 107 are located on the same side of the vertical support 102. The light beam emitted by the optical components on one side of the vertical support 102 is reflected by the two reflectors 107 and then incident on the optical components on the other side of the vertical support 102. Everything else is the same as in Embodiment 1.

[0061] Examples 1 and 2 present an optical tweezers device based on liquid crystal devices for experimental teaching and scientific research. Unlike commercial optical tweezers currently on the market, this device utilizes liquid crystal devices to generate a specific optical phase, modulates the wavefront of a light beam, and achieves specific manipulation of the spatial motion of tiny particles. It features an intuitive optical design, an easy-to-understand working principle for students, and a convenient operating space for hands-on experiments. It is suitable for students of different age groups and has significant advantages in stimulating students' interest in physics, cultivating their spirit of exploration, and improving their scientific literacy. While taking into account its applicability to scientific research, it focuses on cultivating students' abilities and stimulating their interest, bringing the forefront of science and technology in the world to students at close range, broadening their horizons while improving their experimental skills.

[0062] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A liquid crystal device-based optical tweezer device for experimental teaching and scientific research, characterized in that, The optical component support frame and the light source module, the beam expander module, the polarization control module, the wavefront modulation module, the beam reducer module, the focusing module, the sample adjustment module, the microscopy module and the monitoring recording module mounted on the optical component support frame are comprised; The wavefront modulation module comprises a second adjustable diaphragm (501), a patterned orientation liquid crystal wave plate (502) and a liquid crystal wave plate adjustment frame (503), the second adjustable diaphragm (501) and the liquid crystal wave plate adjustment frame (503) are movably arranged on the optical component support frame, and the patterned orientation liquid crystal wave plate (502) is arranged on the liquid crystal wave plate adjustment frame (503); The focusing module comprises a right-angle optical adjustment frame (701), a first beam splitter (702), a first objective lens (703) and an objective lens fine adjustment frame (704), the right-angle optical adjustment frame (701) and the objective lens fine adjustment frame (704) are movably arranged on the optical component support frame, the first beam splitter (702) is arranged on the right-angle optical adjustment frame (701), and the first objective lens (703) is arranged on the objective lens fine adjustment frame (704); The sample adjustment module comprises a sample clamping frame (801), a three-axis fine adjustment platform (802) and a particulate sample (803), the three-axis fine adjustment platform (802) is movably arranged on the optical component support frame, the sample clamping frame (801) is arranged on the three-axis fine adjustment platform (802), and the particulate sample (803) is arranged on the sample clamping frame (801); The monitoring recording module comprises a first monitoring camera (1001), a protective sheet (1002), a computer (1003) and a second monitoring camera (1004), the first monitoring camera (1001) and the second monitoring camera (1004) are electrically connected with the computer (1003), the first monitoring camera (1001) is arranged on the right-angle optical adjustment frame (701) and receives reflected laser from the particulate sample (803) and transmitted light of the particulate sample (803) under illumination of the illumination light source (903), and the first monitoring camera (1001) is used for real-time monitoring and recording of focusing condition and motion condition of particles in the particulate sample (803), the protective sheet (1002) is arranged on the first monitoring camera (1001), the protective sheet (1002) is a 25% light attenuation sheet or a color filter sheet, and the second monitoring camera (1004) is arranged on the microscopy module and is used for real-time monitoring and recording of the motion condition of the particles in the particulate sample (803). 2.The optical tweezers device based on liquid crystal device for experimental teaching and scientific research according to claim 1, characterized in that, The optical component support frame comprises an optical face breadboard (101) and a vertical support (102) vertically arranged on the optical face breadboard (101), a plurality of sliding bases movably arranged on the vertical support (102) along the normal direction of the optical face breadboard (101), each sliding base comprising a mounting sliding block (103), a support rod sleeve (104) and a support rod (105), the mounting sliding block (103) being movably arranged on the vertical support (102), the support rod sleeve (104) being fixed vertically on the mounting sliding block (103), and the support rod (105) being coaxially inserted into the support rod sleeve (104). 3.The optical tweezers device based on liquid crystal device for experimental teaching and scientific research according to claim 2, characterized in that, The optical component support frame further comprises two mirrors (107), each mirror (107) being fixed on one of the sliding bases through a mirror support (106), the two mirrors (107) being symmetrically arranged about the vertical support (102), the light source module, the beam expanding module, the polarization control module and one of the mirrors (107) being located on the same side of the vertical support (102), and the wavefront modulation module, the beam reducing module, the focusing module, the sample adjusting module, the microscopy module, the monitoring recording module and the other mirror (107) being located on the same side of the vertical support (102). 4.The optical tweezers device based on liquid crystal device for experimental teaching and scientific research of claim 1, wherein, The light source module comprises a solid laser (201), a first adjustable diaphragm (202) and an adjustable optical attenuator (203) movably arranged in sequence on the optical component support frame. 5.The optical tweezers device based on liquid crystal device for experimental teaching and scientific research according to claim 1, characterized in that, The polarization control module comprises a signal voltage output device (406), a linear polarizer (401), an electrically controlled liquid crystal wave plate and a quarter wave plate movably arranged on the optical component support frame, the signal voltage output device (406) being arranged on the optical component support frame and electrically connected with the electrically controlled liquid crystal wave plate, the number of the electrically controlled liquid crystal wave plates being one or more, and the number of the quarter wave plates being one or more. 6.The optical tweezers device based on liquid crystal device for experimental teaching and scientific research according to claim 1, characterized in that, The beam expanding module comprises two first lens groups (301) with different focal lengths, the beam expanding module being movably arranged on the optical component support frame. The beam reducing module comprises two second lens groups (601) with different focal lengths, the beam reducing module being movably arranged on the optical component support frame. 7.The optical tweezers device based on liquid crystal device for experimental teaching and scientific research according to claim 1, characterized in that, The microscopy module comprises a second objective lens (901), an eyepiece (902), an illumination device, a stand column (904), a microscope adjusting frame (905), a microscope straight cylinder (906) and a color filter (907), the stand column (904) being arranged on the optical component support frame, the microscope adjusting frame (905) being movably arranged on the stand column (904), the microscope straight cylinder (906) being arranged on the microscope adjusting frame (905), one end of the microscope straight cylinder (906) being connected with the second objective lens (901) and the other end being connected with the eyepiece (902), the color filter (907) being arranged on the second objective lens (901), and the illumination device being arranged on the microscope straight cylinder (906).

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