CN114743714A - Target control device, system and method - Google Patents
Target control device, system and method Download PDFInfo
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- CN114743714A CN114743714A CN202210422908.6A CN202210422908A CN114743714A CN 114743714 A CN114743714 A CN 114743714A CN 202210422908 A CN202210422908 A CN 202210422908A CN 114743714 A CN114743714 A CN 114743714A
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
- G21K1/006—Manipulation of neutral particles by using radiation pressure, e.g. optical levitation
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
Abstract
The embodiment of the application provides a target control device, and belongs to the field of optical super-surfaces. The manipulation device of the target comprises a first superlens and a second superlens; the first super lens converts the first incident laser into a first convergent beam and a first vortex beam; the light potential well of the first convergent light beam is overlapped with the light potential well of the first vortex light beam; the second superlens converts the second incident laser light into a second focused beam and a second vortex beam; the light potential well of the second convergent light beam is overlapped with the light potential well of the second vortex light beam; a first optical axis of the first superlens and a second optical axis of the second superlens intersect; the first incident laser is a pair of orthogonal polarized lights; the second incident laser light is another pair of orthogonally polarized light. The device realizes the capture and the control of the target rotation at a fixed position.
Description
Technical Field
The present application relates to the field of optical superlenses, and in particular, to a target manipulation apparatus, system and method.
Background
Optical tweezers (Optical Tweezer) is a tool with wide application prospect in microscopic science fields such as biology field and atomic science field. The optical tweezers guide and control the target through the converged laser. The aforementioned targets include atoms, molecules, cells and other micro-or nano-scale particles, and the like.
When light is scattered, photons carry momentum, and when the photons pass through the particles, the photons can generate force on the particles, so that the particles are pushed. The optical tweezers form a light potential well by utilizing laser convergence, and an intensity gradient is generated near a focus. When the gradient force and radiation pressure of the light are balanced, the target on the light propagation path can be stably captured.
From the above, the working principle of the optical tweezers limits the degree of freedom of the optical tweezers in controlling the target, and only the position of the target can be limited, but the posture of the target cannot be controlled.
Therefore, there is a need for a manipulation device, system and method capable of extending the degree of freedom of manipulation of a target.
Disclosure of Invention
In order to solve the technical problem that the optical tweezers can only limit the target position in the prior art, the embodiment of the application provides a target control device, a target control system and a target control method.
In one aspect, embodiments of the present application provide an object manipulating device, which includes a first superlens and a second superlens;
the first super lens converts the first incident laser into a first convergent beam and a first vortex beam; the light potential well of the first convergent light beam is overlapped with the light potential well of the first vortex light beam;
the second superlens converts the second incident laser light into a second focused beam and a second vortex beam; the light potential well of the second convergent light beam is overlapped with the light potential well of the second vortex light beam;
a first optical axis of the first super lens and a second optical axis of the second super lens intersect, and the light potential well are located at the same position;
the first incident laser is a pair of orthogonal polarized lights; the second incident laser light is another pair of orthogonally polarized light.
Optionally, the first superlens and the second superlens are identical.
Optionally, the first optical axis is orthogonal to the second optical axis, and the potential well of the first converging beam and the potential well of the second converging beam are not in the same position.
Optionally, the phase adjustment of the incident laser light by each of the first and second superlenses satisfies:
wherein, phi _ x and phi _ y are the phases of two beams of orthogonal polarized light respectively; k is a radical of formula0Is the wave number in vacuum, r is the distance from any point on the superlens to the superlens center; f. ofOTIs the focal length of the focused beam; f. ofOSIs the focal length of the vortex beam; l is the topological charge of the vortex rotation,
is the azimuth angle.
Optionally, each of the first and second superlenses comprises a substrate and a microstructure layer disposed on the substrate;
wherein the microstructure layer comprises superstructure units arranged periodically;
a micro-nano structure is arranged in the superstructure unit, and the micro-nano structure is a polarization-related structure.
Optionally, the superstructure unit is shaped as a close-packable pattern; and the number of the first and second electrodes,
the micro-nano structure is arranged at the vertex and/or the center of the close-packed graph.
Optionally, the period of the superstructure unit is greater than or equal to 200nm and less than or equal to 1500 nm.
Optionally, the superlens further comprises a filler material;
the filling material is filled among the micro-nano structures; and the absolute value of the difference between the refractive indexes of the filling material and the micro-nano structure is greater than or equal to 0.5.
Optionally, the shape of the micro-nano structure comprises a nanofin.
Optionally, the height of the micro-nano structure is equal to 700 nm.
Optionally, the dimension of the micro-nano structure perpendicular to the height axis is greater than or equal to 50nm and less than or equal to 350 nm.
Optionally, the radii of the first superlens and the second superlens are both greater than or equal to 4 μm and less than or equal to 10 μm.
Optionally, the first superlens and the second superlens are both greater than or equal to 0.2 and less than or equal to 0.5.
Optionally, the refractive index of each of the first superlens and the second superlens is greater than or equal to 1.45 and less than or equal to 1.6.
In another aspect, an embodiment of the present application further provides a target operation and control system, where the system includes at least two target operation and control devices provided in the foregoing embodiments.
In another aspect, an object manipulating method according to an embodiment of the present application is applicable to an object manipulating apparatus and an object manipulating system provided in the above embodiments, where the method includes:
capturing the target at a reference position through the first superlens and the second superlens;
controlling a rotation angle of the target around a first optical axis by controlling an irradiation duration of the first vortex beam; or
Controlling a rotation angle of the target around the second optical axis by controlling an irradiation period of the second vortex beam.
The control device of target that this application embodiment provided converts orthogonal polarized light into convergent light beam and vortex light beam to make the focus of convergent light beam and the light power equilibrium point coincidence of vortex light beam, realized the position of target to be prescribed a limit to and the controllable regulation to target rotation angle through optical axis quadrature and focus coincidence's first super lens and second super lens.
According to the control system of the targets, the position limitation of the multiple targets and the controllable adjustment of the rotation angles of the multiple targets are achieved through the control devices of at least two targets.
According to the control method of the target, the orthogonal polarized light is converted into the convergent light beam and the vortex light beam, the focus of the convergent light beam is overlapped with the light force balance point of the vortex light beam, and the position limitation of the target and the controllable adjustment of the target rotation angle are achieved through the first super lens and the second super lens, the optical axes of which are orthogonal, and the focuses of which are overlapped. The control of the target rotation angle is realized by adjusting the irradiation duration of the vortex beam.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic structural diagram illustrating an alternative configuration of a target manipulation device provided in an embodiment of the present application;
FIG. 2 is a schematic diagram illustrating an alternative configuration of a super-surface provided by embodiments of the present application;
FIG. 3 illustrates an alternative arrangement of superstructure units provided by embodiments of the present application;
fig. 4 shows yet another alternative arrangement of superstructure units provided by embodiments of the present application;
fig. 5 shows yet another alternative arrangement of superstructure units provided by embodiments of the present application;
fig. 6 shows an alternative schematic diagram of a micro-nano structure provided in an embodiment of the present application;
fig. 7 shows a further alternative schematic diagram of a micro-nano structure provided in an embodiment of the present application;
FIG. 8 illustrates an alternative phase profile for x-polarized light of orthogonal polarizations provided by embodiments of the present application;
FIG. 9 shows an alternative phase profile for y-polarized light of orthogonal polarizations provided by embodiments of the present application;
FIG. 10 illustrates an alternative spot of a converging light beam provided by embodiments of the present application;
FIG. 11 illustrates an alternative spot of a vortex beam provided by embodiments of the present application;
FIG. 12 illustrates an alternative light force distribution of a converging light beam provided by embodiments of the present application;
FIG. 13 illustrates an alternative optical force distribution of a vortex beam provided by embodiments of the present application;
FIG. 14 illustrates yet another alternative optical force distribution of a vortex beam provided by embodiments of the present application.
The reference numerals in the drawings denote:
100-first superlens; 200-second superlens.
Detailed Description
The following description is merely exemplary in nature and is not intended to limit the present application and its applications or uses. It should be understood that throughout the drawings, corresponding reference numerals indicate like or corresponding parts and features. The present teachings are suitable for incorporation on many different types of optical devices. For purposes of illustration, the supersurfaces provided herein are shown as monolithic planar superlenses. However, the present teachings are equally applicable to other combinations of angles.
Example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope to those skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods to provide a thorough understanding of embodiments of the present application. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the application. In some example embodiments, well-known methods, well-known device structures, and well-known technologies are not described in detail.
When an element or layer is referred to as being "on," "engaged to," "connected to" or "coupled to" another element or layer, it can be directly on, engaged, connected or coupled to the other element or layer or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on," or "directly engaged with," "directly connected to," or "directly coupled to" another element or layer, there are no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in the same manner (e.g., "between …" versus "directly between …", "adjacent" versus "directly adjacent", etc.). As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
Another type of manipulation target device is known as an Optical wrench (Optical Spanner). The optical wrench makes the target make circular motion on a plane perpendicular to the optical axis by whirling the light beam. However, since both the optical tweezers and the optical wrench have the disadvantages of complicated structure and complicated optical path, the above disadvantages are obstacles for combining the optical tweezers and the optical wrench.
The use of superlens technology can produce converging and swirling beams by modulating left and right optical rotations, by which the target can be rotated about the optical axis in a certain plane. However, the inventor found that the phase modulation of the focusing light and the vortex rotation by each nano-pillar of the superlens in the prior art is fixed, namely the focusing phase and the vortex phase are related, and the prior art cannot independently regulate and control the positions of the focusing focus and the vortex focus. The inventors have found that, unexpectedly, the principle of the prior art based on the application of geometric phase to the incident light rays results in the selection of nanopillars that are not satisfactory for simultaneously modulating the focusing phase and the swirling phase. When the vortex light beam is adjusted each time, the phenomenon that the target moves between two positions on the optical axis can occur, so that the target cannot be stably observed in the adjusting process. After the adjustment is finished, the position and the posture of the target are changed, and a favorable observation result cannot be obtained. Therefore, the above technical solution cannot artificially control the position and posture of the target, which is not beneficial to the manipulation and observation in practical application. To achieve the human control goal, the present embodiment provides a goal manipulating apparatus, as shown in fig. 1, which includes a first superlens 100 and a second superlens 200. Wherein the first superlens 100 converts the first incident laser light into a first converging beam and a first vortex beam; the position of a light potential well of the first convergent light beam is superposed with that of a light potential well of the first vortex light beam; the second superlens 200 converts the second incident laser light into a second focused beam and a second vortex beam; the light potential well of the second convergent light beam is superposed with the light potential well of the second vortex light beam; the first optical axis of the first superlens 100 and the second optical axis of the second superlens 200 intersect; the first incident laser is a pair of orthogonal polarized lights; the second incident laser light is another pair of orthogonally polarized light. Preferably, the first incident laser beam and the second incident laser beam are linearly polarized light. Alternatively, the first incident laser light and the second incident laser light may be left-right circularly polarized light, and the design complexity is higher with circularly polarized light than with linearly polarized light. The first and second superlenses 100 and 200 are collectively referred to as a superlens in this application. The first converging beam and the second converging beam are collectively referred to as a converging beam. The first and second vortex beams are collectively referred to as vortex beams. The light potential well of the first convergent beam, the light potential well of the second convergent beam, the light potential well of the first vortex beam and the light potential well of the second vortex beam are collectively called as a light potential well. The first incident laser light and the second incident laser light may be the same or different.
Specifically, the superlens in the embodiment of the present application modulates a pair of orthogonal polarized lights based on the principle of propagation phase, and generates a converging light beam (which may also be referred to as a focusing light beam) and a vortex light beam. In the orthogonal polarized light, the light beam in any polarization state is modulated into a convergent light beam by the superlens, and the light beam in the other polarization state is modulated into a vortex light beam by the same superlens. After modulation of the super lens, the positions of the light potential trap of the focusing light beam and the light potential trap of the vortex light beam are superposed. Typically, the optical potential trap of the focused beam is located at the focal point of the focused beam. In the embodiment of the present application, the first superlens 100 and the second superlens 200 apply propagation phases to the first incident laser beam and the second incident laser beam, respectively, so as to realize potential trap coincidence of the vortex beam and the convergent beam. At the position where the vortex light beam and the convergent light beam potential trap are superposed, the resultant force of the vortex light force and the focusing light force borne by the target along the optical axis direction is zero.
That is, the first superlens 100 modulates the first incident light into the first convergent light beam and the first vortex light beam, and the potential well of the first convergent light beam and the potential well of the first vortex light beam coincide in position. Thus, the first converging beam captures the target at the position of the light potential trap of the first converging beam, while the first vortex beam rotates the target on a plane perpendicular to the first optical axis around the optical axis of the first vortex optical rotation. Similarly, the second superlens 200 modulates the second incident light into a second convergent light beam and a second vortex light beam, and the light potential well of the second convergent light beam and the light potential well of the second vortex light beam are overlapped in position. Thus, the second converging light beam captures the target at the position of the light potential trap of the second converging light beam, while the second vortex light beam rotates the target on a plane perpendicular to the second optical axis around the optical axis of the second vortex optical rotation. When the first and second optical axes intersect and the potential well positions of the first and second converging light beams coincide, the first and second meta- surfaces 100 and 200 may be used to control the target to rotate along the first and second optical axes, respectively, without changing the position of the target. Optionally, in this embodiment of the present application, the first focus of the first focused beam and the second focused beam of the second focused beam are not at the same position, so as to achieve stable control of the target.
Illustratively, let the optical axis of the superlens be the z-axis and the plane perpendicular to the optical axis z be the x-y plane. The x-direction and the y-direction are perpendicular to each other and to the optical axis z, respectively. The superlens excites the orthogonally polarized light into a converging beam and a swirling beam, respectively. Taking the example that the x-polarized beam is modulated into the convergent beam by the super lens, the y-polarized beam is modulated into the vortex beam by the super lens. The irradiation time of the vortex beam on the target can be controlled by controlling the switching time of the y-polarized light. The longer the irradiation time of the vortex light beam is, the larger the angle of the target rotating around the optical axis under the action of the vortex light field is. If the y-polarized light is turned off, the target is not rotated. Therefore, by controlling the irradiation time lengths of the first vortex beam and the second vortex beam, the posture of the target can be adjusted. Similarly, the same holds true if the x-polarized light is modulated into a converging beam by the superlens.
According to the embodiment of the application, optionally, the first optical axis and the second optical axis are perpendicular to each other, so that observation of an object at any angle at a fixed viewing angle can be realized. Preferably, the first and second superlenses 100 and 200 are identical.
Further, the phase modulation of the incident laser light by each of the first and second superlenses 100 and 200 satisfies:
wherein phixAnd phiyThe phases of two beams of orthogonal polarized light respectively; k is a radical of0Is the wave number in vacuum, and r is the distance from any point on the superlens to the center of the superlens；fOTIs the focal length of the focused beam; f. ofOSIs the focal length of the vortex beam; l is the topological charge of the vortex rotation,
is the azimuth angle.
It should be noted that the operating wavelength bands of the first superlens 100 and the second superlens 200 are not limited, and a shorter wavelength can generally generate a larger optical power. However, it should also be noted that light in the infrared range can cause thermal effects in biological cells and even cell damage. The target control device provided by the embodiment of the application cannot damage the target.
Next, the first and second superlenses 100 and 200 according to the embodiment of the present application are described in more detail.
A superlens is a particular application of a supersurface. The super-surface is a layer of sub-wavelength artificial nanostructure film, and incident light can be modulated according to super-surface super-structure units on the super-surface. The super-surface superstructure unit comprises a full-medium or plasma nano antenna, and can directly adjust and control the characteristics of light such as phase, amplitude, polarization and the like.
Fig. 2 shows a schematic structural view of a first superlens 100 and a second superlens 200 according to an embodiment of the present application. Fig. 3, 4 and 5 show plan views of the microstructure layers of the first and second superlenses 100 and 200 according to an embodiment of the present application.
As shown in fig. 2, according to an embodiment of the present application, each of the first and second superlenses 100 and 200 includes a substrate and a microstructure layer disposed on the substrate, wherein the microstructure layer includes a periodically arranged superstructure unit. The superstructure unit is provided with a micro-nano structure, and the micro-nano structure is a polarization-dependent structure. The polarization-dependent micro-nano structure is beneficial to applying geometric phase to incident light. As shown in fig. 3, according to embodiments of the present application, the superstructure cells may be arranged in an array of regular hexagons. Furthermore, as shown in fig. 4, according to embodiments of the present application, the superstructure units may be arranged in a square array. As shown in fig. 5, superstructure units may also be arranged in a fan shape, according to embodiments of the present application. Those skilled in the art will recognize that the superstructure units included in the micro-structural layer may also include other forms of array arrangements, and all such variations are within the scope of the present application. The period of the superstructure unit is related to the wavelength of the incident light. Optionally, the period of the superstructure unit is greater than or equal to 200nm and less than or equal to 1500 nm. It should be understood that the periods of the superstructure units in the microstructure layer may be all the same or partially the same.
According to the embodiment of the application, optionally, a micro-nano structure is respectively arranged at the central position and/or the vertex position of each superstructure unit. According to an embodiment of the application, the micro-nano structure is an all-dielectric structural unit. According to the embodiment of the application, the micro-nano structure working waveband has high transmittance. According to an embodiment of the present application, the micro-nano structure may be formed of at least one of the following materials: titanium oxide, silicon nitride, gallium phosphide, aluminum oxide, hydrogenated amorphous silicon, and the like. For example, when the target wavelength band is visible light, the material of the micro-nano structure includes one or more of silicon nitride, titanium oxide, gallium nitride, gallium phosphide and hydrogenated amorphous silicon; when the target waveband is near infrared light, the material of the micro-nano structure comprises one or more of silicon nitride, titanium oxide, gallium nitride, gallium phosphide, hydrogenated amorphous silicon, amorphous silicon and crystalline silicon; when the target waveband is far infrared light, the material of the micro-nano structure comprises one or more of crystalline silicon, crystalline germanium, zinc sulfide and zinc selenide; when the target waveband is ultraviolet light, the material of the micro-nano structure comprises hafnium oxide. It should be noted that the substrate and the micro-nano structure may be made of the same material or different materials.
The micro-nano structures in the super-structured cells of the superlens may have the form of nanofins. Although the micro-nano structure shown in fig. 6 has a rectangular cross section and the micro-nano structure shown in fig. 7 has an elliptical cross section, the present application is not limited thereto. The micro-nano structure can also adopt other forms of structures, and all the variant schemes are covered in the scope of the application. The size of the micro-nano structure is related to the incident wavelength. Optionally, the height of the micro-nano structure is equal to 700 nm. Optionally, the dimension of the micro-nano structure perpendicular to the height axis is greater than or equal to 50nm and less than or equal to 350 nm. The dimension perpendicular to the height axis refers to a dimension of a cross section obtained by cutting the micro-nano structure in a direction perpendicular to the height axis. For example, for nanofins, whose cross-section perpendicular to the height axis is rectangular, the dimension perpendicular to the height axis refers to the length and width of the rectangle. That is, the length and width of the cross section of the nanofin is between 50nm and 350 nm. For another example, for a nanoelliptic cylinder, where the cross-section perpendicular to the elevation axis is an ellipse, the dimension perpendicular to the elevation axis refers to the length of the major and minor axes of the ellipse.
According to the embodiment of the application, air or other transparent or semitransparent materials in the working waveband can be filled between the micro-nano structures. According to the embodiment of the application, the absolute value of the difference between the refractive index of the filled material and the refractive index of the micro-nano structure is greater than or equal to 0.5.
The nanostructures in the first superlens 100 and the second superlens 200 provided in the embodiments of the present application independently control the phases of the converging light beam and the vortex light beam. Alternatively, at least 8 order phases are required for the manipulation of the converging and the swirling beams, respectively, to cover a phase modulation of 0-2 π. That is, the first superlens 100 and the second superlens 200 respectively require at least 64 (or 8 × 8) micro-nano structures to realize multiplexing of the vortex beam and the convergent beam.
In an alternative embodiment, the radii of the first superlens 100 and the second superlens 200 are both greater than or equal to 4 μm and less than or equal to 10 μm. Alternatively, the Numerical Aperture (NA) of each of the first and second superlenses 100 and 200 is greater than or equal to 0.2 and less than or equal to 0.5. According to the embodiment of the present application, optionally, the refractive index of each of the first superlens 100 and the second superlens 200 is greater than or equal to 1.45 and less than or equal to 1.6. Illustratively, the present embodiment provides an object manipulating device, which includes two identical first and second superlenses 100 and 200. Design parameters of the superlens are as follows: radius of 6.5 μm, wavelength of 532nm, topological charge of 1, and two focal lengths of fOT＝10μm，fOS7.5 μm. For a focused beam, its beam waist radius at the focal lengthAbout 1 μm, corresponding to a numerical aperture NA of about 0.32. Wherein f isOTTo focus the beam, fOSIs the focal length of the vortex beam.
The superstructure unit is square, the period is 400nm, and the micro-nano structure is vertically arranged at the center of the superstructure unit. The micro-nano structure adopts nanofins with rectangular cross sections as shown in fig. 6. The substrate material is glass (the refractive index is 1.46), the micro-nano structure material is titanium dioxide (the refractive index is 2.40), and the filling material is air. The height of the micro-nano structure is 700nm, and the length and width of the cross section of the micro-nano structure, which is vertical to the height axis, are greater than or equal to 50nm and less than or equal to 350 nm. The incident laser light of the first and second superlenses 100 and 200 is the same. The incident laser light is a pair of orthogonally polarized light. Fig. 8 shows a phase distribution of x-polarized light in the incident laser light, and fig. 9 shows a phase distribution of y-polarized light in the incident laser light. In the embodiment, 64 micro-nano structures are selected in total, and as shown in fig. 9 and 10, the micro-nano structures can realize phase modulation of 0 to 2 pi for both x-polarized light and y-polarized light. That is, for each order of phase modulation in x-polarization, there are 8 different nanostructures that can achieve a phase modulation of 0-2 π in y-polarized light.
The spot of the converging light beam produced by the superlens in this embodiment at the converging focus is shown in fig. 10. The spot of the vortex beam generated by the superlens in this embodiment at the focus of the vortex beam is shown in fig. 11.
Fig. 12 to 14 show the distribution of light force near the focal point for a polymer bead (refractive index 1.59) with a diameter of 2.5 μm. As can be seen from fig. 12, the small ball is limited to around 10 μm in z under the action of the convergent light beam; if the focal position of the converging light beam is moved, the ball is captured near the new focal position. As shown in fig. 13, the optical force generated by the vortex beam is maximum at the focal point z of 7.5 μm, and the gradient force and scattering force of vortex rotation cannot be balanced, and the longitudinal resultant force direction applied to the pellet is the positive direction of z. The vortex field around z 10 μm creates a potential well where the pellet is bound. That is, if only the vortex beam is considered, the beads receive a resultant force along the light propagation direction at the focal point of the vortex beam. The resultant force pushes the pellet from the focal point in the direction of light propagation, where the resultant force is zero at z 10 μm, where the pellet is trapped at 10 μm. Referring to fig. 14, for the transverse force generated by the vortex field, at x-0 the pellet has no force in the y-direction, and at x-1.5 μm the pellet has no force in the x-direction due to the circular motion of the pellet around the optical axis of the vortex rotation.
From the above, in the embodiment of the present application, the focal point of the converging light beam of the superlens coincides with the light force balance point of the vortex light beam. Therefore, the combined force borne by the target cannot be changed by independently closing the convergent light beam or the vortex light beam, and the target is captured and rotated at a fixed position. Therefore, by switching the polarized light for exciting the vortex beam, the irradiation time of the vortex beam can be changed. The larger the vortex beam irradiation time period, the larger the angle by which the target is rotated.
In the embodiment of the present application, the optical axes of the first superlens 100 and the second superlens 200 intersect, and the positions of the optical power balance points of the first superlens 100 and the second superlens 200 coincide. That is, the first and second superlenses 100 and 200 may respectively achieve capturing and rotating the target at the same position. The irradiation duration of the target by the first vortex beam and the second vortex beam is respectively controlled, so that the purpose of controlling the rotation angle of the target around the first optical axis and the second optical axis can be achieved. The device provided by the embodiment of the application can observe the target at different angles at fixed positions.
On the other hand, the embodiment of the present application further provides a target manipulation system, which includes at least two target manipulation devices provided in the above embodiments. The system can achieve independent manipulation of at least two targets. Further, since the superlens may be processed by a semiconductor process, the first superlenses 100 of the plurality of devices may be integrated into a first superlens array, and the second superlenses 200 of the plurality of devices may be integrated into a second superlens array, so that the structural complexity of the system may be reduced.
In another aspect, an embodiment of the present application further provides a target operation method, where the method at least includes the following steps:
the target is captured at the reference position by the first and second superlenses 100 and 200. The reference position is a position advantageous for observation.
Controlling a rotation angle of the target around the first optical axis by controlling an irradiation duration of the first vortex beam; or the rotation angle of the target around the second optical axis by controlling the irradiation time period of the second vortex beam.
And controlling the irradiation duration of the first vortex beam and the second vortex beam is realized by exciting the polarized light of the first vortex beam or the second vortex beam by a switch.
To sum up, the target control device provided in the embodiment of the present application converts orthogonal polarized light into a converging light beam and a vortex light beam, and enables a focal point of the converging light beam and an optical force balance point of the vortex light beam to coincide with each other, thereby achieving capturing and rotating a target at a fixed position. The position limitation of the target and the controllable adjustment of the rotation angle of the target are realized through the coincidence of the optical power balance points of the first super lens and the second super lens.
According to the target control system provided by the embodiment of the application, the position limitation of a plurality of targets and the controllable adjustment of the rotating angles of the plurality of targets are realized through the control devices of at least two targets.
According to the target control method provided by the embodiment of the application, orthogonal polarized light is converted into the convergent light beam and the vortex light beam, the focus of the convergent light beam is overlapped with the optical force balance point of the vortex light beam, and the position limitation of a target and the controllable adjustment of a target rotation angle are realized through the first super lens and the second super lens, the optical axes of which are orthogonal and the focuses of which are overlapped. The control of the target rotation angle is realized by adjusting the irradiation duration of the vortex beam.
The above description is only a specific implementation of the embodiments of the present application, but the scope of the embodiments of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the embodiments disclosed in the present application, and all the changes or substitutions should be covered by the scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application shall be subject to the protection scope of the claims.
Claims (16)
1. An object manipulation device, characterized in that the device comprises a first superlens (100) and a second superlens (200);
wherein the first superlens (100) converts the first incident laser light into a first converging beam and a first swirling beam; the light potential well of the first convergent light beam is overlapped with the light potential well of the first vortex light beam;
a second superlens (200) converts the second incident laser light into a second focused beam and a second vortex beam; the light potential well of the second convergent light beam is overlapped with the light potential well of the second vortex light beam;
a first optical axis of the first superlens (100) and a second optical axis of the second superlens (200) intersect;
the first incident laser is a pair of orthogonal polarized lights; the second incident laser light is another pair of orthogonally polarized light.
2. The apparatus of claim 1, wherein said first superlens (100) and said second superlens (200) are identical.
3. The apparatus of claim 1, wherein the first optical axis is orthogonal to the second optical axis.
4. The apparatus of claim 1, wherein the phase modulation of the incident laser light by each of the first superlens (100) and the second superlens (200) is such that:
wherein phi isxAnd phiyThe phases of two beams of orthogonal polarized light respectively;k0is the wave number in vacuum, r is the distance from any point on the super lens to the center of the super lens; f. ofOTIs the focal length of the focused beam; f. ofOSIs the focal length of the vortex beam; l is the topological charge of the vortex rotation,
is the azimuth.
5. The apparatus of claims 1-4, wherein each of the first superlens (100) and the second superlens (200) comprises a substrate and a microstructured layer disposed on the substrate;
wherein the microstructure layer comprises superstructure units arranged periodically;
a micro-nano structure is arranged in the superstructure unit, and the micro-nano structure is a polarization-related structure.
6. The apparatus of claim 5, wherein the superstructure units are shaped as a close-packable pattern; and the number of the first and second electrodes,
the micro-nano structure is arranged at the vertex and/or the center of the close-packed graph.
7. The apparatus of claim 5, wherein a period of the superstructure unit is greater than or equal to 200nm and less than or equal to 1500 nm.
8. The apparatus of claim 5, wherein the superlens further comprises a fill material;
the filling material is filled among the micro-nano structures; and the absolute value of the difference between the refractive indexes of the filling material and the micro-nano structure is greater than or equal to 0.5.
9. The apparatus of claim 5, wherein the micro-nano structure comprises a nanofin in shape.
10. The apparatus of claim 9, wherein the micro-nano structures have a height equal to 700 nm.
11. The apparatus of claim 8, wherein the micro-nano structure has a dimension perpendicular to the height axis that is greater than or equal to 50nm and less than or equal to 350 nm.
12. The apparatus according to claim 5, wherein the radii of the first superlens (100) and the second superlens (200) are each greater than or equal to 4 μm and less than or equal to 10 μm.
13. The apparatus of claim 5, wherein the first superlens (100) and the second superlens (200) are each greater than or equal to 0.2 and less than or equal to 0.5.
14. The apparatus of claim 5, wherein the refractive index of each of the first superlens (100) and the second superlens (200) is greater than or equal to 1.45 and less than or equal to 1.6.
15. An object handling system, characterized in that the system comprises at least two handling devices for objects according to any of claims 1-14.
16. An object handling method, applicable to the apparatus of claims 1-14 and the system of claim 15, the method comprising:
capturing the target at a reference position by the first superlens (100) and the second superlens (200);
controlling a rotation angle of the target around a first optical axis by controlling an irradiation duration of the first vortex beam; or
Controlling a rotation angle of the target around the second optical axis by controlling an irradiation period of the second vortex beam.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210422908.6A CN114743714A (en) | 2022-04-21 | 2022-04-21 | Target control device, system and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116540406A (en) * | 2023-07-04 | 2023-08-04 | 天府兴隆湖实验室 | Method for constructing light sail and light sail |
| US11927769B2 (en) | 2022-03-31 | 2024-03-12 | Metalenz, Inc. | Polarization sorting metasurface microlens array device |
| US11978752B2 (en) | 2019-07-26 | 2024-05-07 | Metalenz, Inc. | Aperture-metasurface and hybrid refractive-metasurface imaging systems |
-
2022
- 2022-04-21 CN CN202210422908.6A patent/CN114743714A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11978752B2 (en) | 2019-07-26 | 2024-05-07 | Metalenz, Inc. | Aperture-metasurface and hybrid refractive-metasurface imaging systems |
| US11927769B2 (en) | 2022-03-31 | 2024-03-12 | Metalenz, Inc. | Polarization sorting metasurface microlens array device |
| CN116540406A (en) * | 2023-07-04 | 2023-08-04 | 天府兴隆湖实验室 | Method for constructing light sail and light sail |
| CN116540406B (en) * | 2023-07-04 | 2023-09-12 | 天府兴隆湖实验室 | Method for constructing light sail and light sail |
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