Method and device for producing multifunctional optical bottle
By performing multi-parabolic curve phase modulation and hologram loading on the initial beam, multi-functional control of the optical bottle is achieved, solving the problem of low selectivity of existing optical bottle operation methods, and improving the flexibility and selectivity of particle manipulation.
Patent Information
- Application Number
- CN202510197256.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2025-05-13
AI Technical Summary
The existing operating methods of optical bottles can only achieve a single function, with low control selectivity and cannot selectively manipulate captured particles.
By performing multi-parabolic curve phase modulation on the initial beam, optical bottles in different states are formed, and pre-set holograms are loaded with a spatial light modulator to modulate the beam, thereby realizing switching, movement and selective control of the optical bottle.
It realizes multi-functional control of optical bottles, improves the selectivity and flexibility of particle manipulation, and can dynamically control the number and position of optical bottles, realizing layered control and multiple control of particles.
Smart Images
Figure CN119987171A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of particle manipulation, and in particular to a method for producing a multifunctional optical bottle. Background Art
[0002] The concept of "optical bottle" refers to the dark space structure formed by the light beam during its propagation. This dark space is surrounded by a light beam with a relatively high light intensity, forming a structure similar to a "bottle", hence the name "optical bottle". This unique dark space structure enables it to capture multiple absorbing particles at the same time, and has broad application prospects in the field of particle manipulation.
[0003] See also Figure 1 , the laser beam emitted by the laser 10 can be spatially processed by the operating unit 40, and then spatially filtered by the filtering unit 50 to obtain an optical bottle. At present, researchers have proposed many operating methods to produce optical bottles, such as phase modulation, moiré fringe technology, self-imaging effect, Fourier space generation method, etc. The optical bottle obtained by these operating methods can be used to capture and manipulate absorbing particles, such as an optical bottle that can be turned on and off, and manipulate particles to perform circular motion. However, the optical bottle produced by the existing operating method can only achieve a single function and has low manipulation selectivity.
[0004] Specifically, due to the special structure of the optical bottle, the optical bottle produced by the existing method can only trap a single particle or the multiple particles it captures can only be manipulated as a whole, but cannot select a part of the trapped particles for manipulation, which limits its operation function and selectivity. Although there are multiple methods for producing optical bottles, how to produce optical bottles with multiple functions still needs to be studied. Summary of the invention
[0005] Based on this, the object of the present invention is to provide a method for producing a multifunctional optical bottle, which can realize the switching and movement of the optical bottle and has selectivity.
[0006] A method for producing a multifunctional optical bottle, comprising:
[0007] The laser continuously emits the initial beam;
[0008] A spatial light modulator, loaded with a preset hologram, modulates the initial light beam to form a modulated light beam; and
[0009] A filtering unit, which performs spatial filtering on the modulated light beam to form an optical bottle;
[0010] The hologram is formed by the interference of a simulated plane wave and a circular-like Airy vortex beam that has been phase-modulated by a multi-parabolic curve.
[0011] Furthermore, the multi-parabola phase modulated circular Airy vortex beam specifically generates the following: The initial light field expression is:
[0012]
[0013] Among them, the quasi-circular Airy vortex beam adopts the second-order circular Olfer beam, and the Olfer function is
[0014]
[0015] The vortex term is
[0016]
[0017] The multi-parabola phase modulation term is
[0018]
[0019] The phase of the parabola is
[0020]
[0021] The truncation function is
[0022]
[0023] l is the topological charge number, j is the number of superimposed wavefronts, A j (r) is the modulation amplitude, and the parabola curve is c(z) = az 2 , w 0 is the beam width, α is the cutoff factor, β is the distribution factor, r 0 is the radius of the initial main ring, t=n+3 in the nth-order Olfer function,
[0024] Furthermore, it also includes a computer, through which the phase of the multi-parabola curve is modulated to obtain different holograms to form optical bottles in different states.
[0025] Furthermore, the filtering unit includes a first focusing lens, an aperture and a second focusing lens; the focal lengths of the first focusing lens and the second focusing lens are both f, and the distance between the first focusing lens and the spatial light modulator is f; the second focusing lens is arranged between the reflector and the first focusing lens, and the distance between the second focusing lens and the reflector is f; the aperture is arranged between the second focusing lens and the first focusing lens, and the distances between the aperture and the first focusing lens and the second focusing lens are both f.
[0026] Furthermore, it also includes a cuvette, which is arranged in the emission direction of the filtered light beam. The cuvette is provided with mesophase carbon microspheres, which tend to stay away from high light intensity areas when irradiated by laser so as to be captured by the optical bottle to achieve particle manipulation.
[0027] Furthermore, it also includes a beam reduction unit, which is arranged between the cuvette and the filtering unit, and the beam reduction unit reduces the optical bottle light beam into the cuvette.
[0028] Furthermore, it also includes a camera, which is arranged on the side of the cuvette, and the camera records the scattered light of the mesophase carbon microspheres and displays the captured image of the microspheres.
[0029] The present invention also provides a method for producing a multifunctional optical bottle, comprising:
[0030] Continue to emit the initial beam;
[0031] Loading a preset hologram to modulate the initial light beam to form a modulated light beam;
[0032] The modulated light beam is spatially filtered to form an optical bottle;
[0033] The hologram is formed by the interference of a simulated plane wave and a circular-like Airy vortex beam that has been phase-modulated by a multi-parabolic curve.
[0034] Furthermore, the multi-parabola phase modulated circular Airy vortex beam specifically generates the following: The initial light field expression is:
[0035]
[0036] Among them, the quasi-circular Airy vortex beam adopts the second-order circular Olfer beam, and the Olfer function is
[0037]
[0038] The vortex term is
[0039]
[0040] The multi-parabola phase modulation term is
[0041]
[0042] The phase of the parabola is
[0043]
[0044] The truncation function is
[0045]
[0046] l is the topological charge number, j is the number of superimposed wavefronts, A j (r) is the modulation amplitude, and the parabolic curve is c(z) = az 2 , w 0 is the beam width, α is the cutoff factor, β is the distribution factor, r 0 is the radius of the initial main ring, t=n+3 in the nth-order Olfer function,
[0047] Furthermore, the phases of the multi-parabola curves are modulated to obtain different holograms, forming optical bottles in different states.
[0048] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0049] Figure 1 It is a schematic diagram of the structure of the existing optical bottle production device.
[0050] Figure 2 This is a structural diagram of a device for producing a multifunctional optical bottle of the present application.
[0051] Figure 3 An optical image of a single optical bottle generated by the multifunctional optical bottle generating device of the present application.
[0052] Figure 4 It is a schematic diagram of a single optical bottle detected by a receiver in the device for producing a multifunctional optical bottle of the present application when it is opened and closed.
[0053] Figure 5 It is a schematic diagram of two optical bottles detected by a receiver in the multifunctional optical bottle production device of the present application, when one of the optical bottles remains unchanged and the other optical bottle is opened and closed.
[0054] Figure 6 It is a schematic diagram of two optical bottles detected by a receiver in the multifunctional optical bottle production device of the present application, when one of the optical bottles remains unchanged, and the other optical bottle is opened, closed, and moved at different distances. DETAILED DESCRIPTION
[0055] The applicant carefully analyzed the existing optical bottle production method and found that the optical bottle obtained has a single function because the special structure of the optical bottle allows the captured multiple particles to be imprisoned singly or can only be manipulated as a whole, and cannot select a part of the captured particles for manipulation, which limits its manipulation function and selectivity. To this end, the present invention attempts to change the integrity of particle manipulation. Since the particles cannot be manipulated directly, the present invention can obtain a secondary or multiple self-focusing beam by performing multi-parabolic curve phase modulation on the circular Airy vortex beam; on the basis of the vortex phase, by adjusting the focus position, it produces destructive interference, thereby forming a hollow high-strength optical bottle, and by adjusting the number and position of the focus to complete the dynamic manipulation of the particles, thereby realizing the multifunctional manipulation of the optical bottle.
[0056] Based on this, the present invention designs a device for producing a multifunctional optical bottle, which is used to produce a multifunctional optical bottle. Figure 1 The device for producing the multifunctional optical bottle of the present application includes a laser 10, a Glan prism 20, a beam expander 30, a spatial light modulator 40, a filtering unit 50, a reflector 60, a beam shrinking unit 70, a cuvette 80, a camera 90 and a computer (not shown). The laser 10 continuously emits an initial light beam, the spatial light modulator 40 modulates the initial light beam to form a modulated light beam, and the filtering unit 50 performs spatial filtering on the modulated light beam to form an optical bottle, wherein the spatial light modulator 40 serves as an operating unit of the present invention.
[0057] The Glan prism 20 is disposed between the beam expander 30 and the laser 10. The Glan prism 20 is a polarizing prism that separates the o-light polarization component in the initial light beam and transmits only the e-light polarization component in the initial light beam to obtain a polarized light beam, which can be used to adjust power.
[0058] The beam expander 30 is arranged between the spatial light modulator 40 and the Glan prism 20, and is used to expand the polarized light beam to obtain a preliminary light beam. The beam expander 30 includes two convex lenses, the former has a focal length of 50mm and the latter has a focal length of 200mm, so as to expand the light beam by 4 times and enlarge the beam diameter of the polarized light beam for easy modulation.
[0059] The spatial light modulator 40 receives the preliminary light beam, modulates the preliminary light beam, and then reflects the preliminary light beam to form a modulated light beam.
[0060] The computer is connected to the spatial light modulator 40, and a plurality of different pre-set holograms are loaded into the spatial light modulator 40, wherein the hologram is formed by the interference of a plane wave simulated by a computer and a circular-like Airy vortex light beam after multi-parabolic curve phase modulation.
[0061] Specifically, the method for generating a circular Airy vortex beam with multi-parabola phase modulation is as follows:
[0062] The initial light field expression is:
[0063]
[0064] Among them, the circular Airy vortex beam uses a second-order circular Olfer beam, and the Olfer function is
[0065]
[0066] The vortex term is
[0067]
[0068] The multi-parabola phase modulation term is
[0069]
[0070] The phase of the parabola is
[0071]
[0072] The truncation function is
[0073]
[0074] l is the topological charge number, j is the number of superimposed wavefronts, A j (r) is the modulation amplitude, and the parabolic curve is c(z) = az 2 , w 0 is the beam width, α is the cutoff factor, β is the distribution factor, r 0 is the radius of the initial main ring, t=n+3 in the nth-order Olfer function,
[0075] The filtering unit 50 is arranged between the reflector 60 and the spatial light modulator 40, and performs spatial filtering on the modulated light beam to obtain a filtered light beam. The filtering unit 50 includes a first focusing lens 51, an aperture 52, and a second focusing lens 53; the focal lengths of the first focusing lens 51 and the second focusing lens 53 are both f, and the distance between the first focusing lens 51 and the spatial light modulator 40 is f; the second focusing lens 53 is arranged between the reflector 60 and the first focusing lens 51, and the distance between the second focusing lens 53 and the reflector 60 is f; the aperture 52 is arranged between the second focusing lens 53 and the first focusing lens 51, and the distance between the aperture 52 and the first focusing lens 51 and the second focusing lens 53 is both f, and together they form a 4f system; wherein the plane where the aperture 52 is located is the spectrum plane of the filtering unit 50.
[0076] See also Figure 2By adjusting the aperture, the +1-order diffraction stripes carrying light field information are selected on the spectrum surface of the filter unit 50 to pass through, and the filtered light beam can form an optical bottle.
[0077] The filtered beam can be focused by modulating the phase of multiple parabolic curves. The wavefronts of multiple parabolic curve phase modulations can be superimposed to form multiple focal points, and under the action of the vortex phase, a single or multiple optical bottles can be formed. Since the wavefronts after different modulations have different phase information, the superposition will form a significant interference effect. Please refer to Figure 3 By changing the focal position, destructive interference on the axis can be generated to form a hollow high-intensity optical bottle; at the same time, constructive interference can also be generated to form a high-intensity connection area between the two focal points, representing the closure of the optical bottle. In addition, due to the adjustability of the number and position of the focal points, the number and position of the optical bottles can be freely set. See Figure 4 , in two optical bottles, only one of them can be closed while the other remains unchanged. Figure 5 , only one of the optical bottles is moved and closed, and the other optical bottle remains open and fixed. The above-mentioned dynamic manipulation of the optical bottle can be achieved by simply switching the hologram loaded on the spatial light modulator 40, thereby manipulating the particles bound in the optical bottle. Therefore, the multifunctional optical bottle production method of the present application enriches the function of the optical bottle to manipulate the particles; by controlling the number of optical bottles, the integrity of the particle control is changed, and more particle selectivity is brought. In particular, adding an off-axis factor to the phase of the multi-parabola curve can also change the direction of the optical bottle; in addition, by flexibly setting the distance of each movement, the transmission speed of the particles can be changed. Through the above various manipulations and applications of the optical bottle, layered control and multiple controls of the particles can be achieved, thereby achieving multiple functions of the optical bottle.
[0078] The reflector 60 is disposed in the emission direction of the filtered light beam to reflect the filtered light beam into the cuvette 80 , so that the optical bottle appears in the cuvette 80 .
[0079] The beam reduction unit 70 is disposed between the reflector 60 and the cuvette 80, and includes two convex lenses with focal lengths of 300 mm and 50 mm respectively. The optical bottle of the filtered light beam is reduced to a suitable size by the beam reduction unit 70, preferably reduced by 6 times, so as to be irradiated into the cuvette 80 and manipulate the particles in the cuvette 80.
[0080] The cuvette 80 is filled with mesocarbon microspheres, which tend to move away from the high light intensity area when irradiated by laser, and are thus captured by the optical bottle.
[0081] The display unit 90 is a camera placed on the side of the cuvette and used to capture scattered light information of the mesocarbon microspheres to observe the effect of particle manipulation.
[0082] The following is a detailed description of the operation process of the multifunctional optical bottle production device of the present application:
[0083] The laser 10 continuously emits an initial light beam with a wavelength of 532nm, which forms a polarized light beam after passing through the Glan prism 20. The polarized light beam is incident on the beam expander 30 for beam expansion and collimation to obtain a preliminary light beam, and the preliminary light beam is irradiated on the reflective spatial light modulator 40 for modulation and reflection to obtain a modulated light beam; the spatial light modulator 40 is connected to a computer and pre-loaded with multiple different holograms; the modulated light beam is incident on the filtering unit 50 for spatial filtering, and the +1-order diffraction stripes carrying light field information are selected on the spectrum plane to pass through, so as to obtain a filtered light beam with an optical bottle; the filtered light beam is reflected by the reflector 60 and enters the beam reduction unit 70, and after the beam diameter is reduced by the beam reduction unit 70, it is irradiated in the cuvette 80 for particle manipulation; the display unit records the scattered light information of the mesophase carbon microspheres on the side of the cuvette, so as to observe the experimental effect of particle manipulation.
[0084] The method for producing a multifunctional optical bottle of the present invention modulates the hologram of the spatial light modulator by modulating the phase of the multi-parabola curve, thereby changing the modulation effect on the laser beam, thereby obtaining an optical bottle with multiple functions, which can realize operations such as transmission speed control and local control of particles, greatly improving the practicality of the optical bottle.
[0085] The above-mentioned embodiments only express the best implementation mode of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, and the present invention is also intended to include these modifications and modifications.
Claims
1. A device for producing a multifunctional optical bottle, characterized in that: include The laser continuously emits the initial beam; A spatial light modulator, which loads a preset hologram and modulates the initial light beam to form a modulated light beam; as well as A filtering unit, which performs spatial filtering on the modulated light beam to form an optical bottle; The hologram is formed by the interference of a simulated plane wave and a circular-like Airy vortex beam that has been phase-modulated by a multi-parabolic curve.
2. The device for producing a multifunctional optical bottle according to claim 1, characterized in that: The multi-parabola phase modulated circular Airy vortex beam is specifically generated to meet the following requirements: The initial light field expression is: Among them, the quasi-circular Airy vortex beam adopts the second-order circular Olfer beam, and the Olfer function is The vortex term is The multi-parabola phase modulation term is The phase of the parabola is The truncation function is l is the topological charge number, j is the number of superimposed wavefronts, A j (r) is the modulation amplitude, and the parabolic curve is c(z) = az 2 , w0 is the beam width, α is the cutoff factor, β is the distribution factor, r0 is the initial main ring radius, t=n+3 in the nth-order Olfer function, 3. The device for producing a multifunctional optical bottle according to claim 2, characterized in that: The invention also comprises a computer, through which the phases of the multi-parabola curves are modulated to obtain different holograms, thereby forming optical bottles in different states.
4. The device for producing a multifunctional optical bottle according to claim 3, characterized in that: The filtering unit includes a first focusing lens, an aperture and a second focusing lens; the focal lengths of the first focusing lens and the second focusing lens are both f, and the distance between the first focusing lens and the spatial light modulator is f; the second focusing lens is arranged between the reflector and the first focusing lens, and the distance between the second focusing lens and the reflector is f; the aperture is arranged between the second focusing lens and the first focusing lens, and the distances between the aperture and the first focusing lens and the second focusing lens are both f.
5. The device for producing a multifunctional optical bottle according to claim 4, characterized in that: It also includes a cuvette, which is arranged in the emission direction of the filtered light beam. The cuvette is provided with mesophase carbon microspheres, which tend to stay away from high light intensity areas when irradiated by laser, so as to be captured by the optical bottle to achieve particle manipulation.
6. The device for producing a multifunctional optical bottle according to claim 5, characterized in that: The invention also comprises a beam contraction unit, which is arranged between the cuvette and the filtering unit, and the beam contraction unit contracts the optical bottle light beam into the cuvette.
7. The device for producing a multifunctional optical bottle according to claim 6, characterized in that: The device also includes a camera, which is arranged on the side of the cuvette, and the camera records the scattered light of the mesocarbon microspheres and displays the captured image of the microspheres.
8. A method for producing a multifunctional optical bottle, characterized in that: include: Continue to emit the initial beam; Loading a preset hologram to modulate the initial light beam to form a modulated light beam; The modulated light beam is spatially filtered to form an optical bottle; The hologram is formed by the interference of a simulated plane wave and a circular-like Airy vortex beam that has been phase-modulated by a multi-parabolic curve.
9. The method for producing a multifunctional optical bottle according to claim 8, characterized in that: The multi-parabola phase modulated circular Airy vortex beam is specifically generated to meet the following requirements: The initial light field expression is: Among them, the quasi-circular Airy vortex beam adopts the second-order circular Olfer beam, and the Olfer function is The vortex term is The multi-parabola phase modulation term is The phase of the parabola is The truncation function is l is the topological charge number, j is the number of superimposed wavefronts, A j (r) is the modulation amplitude, and the parabolic curve is c(z) = az 2 , w0 is the beam width, α is the cutoff factor, β is the distribution factor, r0 is the initial main ring radius, t=n+3 in the nth-order Olfer function, 10. The method for producing a multifunctional optical bottle according to claim 9, characterized in that: The phases of multiple parabolic curves are modulated to obtain different holograms and form optical bottles in different states.