CN101388259B - Optical Clamp Control - Google Patents

Abstract

The optical clamp control device comprises a light source, an objective lens and a focusing adjustment unit. The focus adjustment unit is disposed between the light source and the objective lens, and includes a surface lens group and a variable focus lens group. The surface mirror group comprises at least one surface mirror, and the surface mirror is rotatably arranged to change the emergent angle of the light source after irradiating the surface mirror. The variable-focus lens group comprises at least one zoom lens which is arranged corresponding to the surface mirror. The light can move in the focal plane or in front of or behind the focal plane by rotating the mirror or changing the focal length of the zoom lens. The optical clamp control device of the invention can lead the focusing position of the laser to be changed randomly in space by matching the surface lens group and the variable focus lens group.

Description

Optical Clamp Control

technical field

The invention relates to an optical clamp control device, and in particular to an optical clamp control device which can arbitrarily change the position of the optical clamp in space. the

Background technique

The optical clamp technology using laser focusing has been applied in the fields of micro-electromechanical, biomedicine and so on. Because the laser has a trapping-like effect on the particles, it is possible to control the movement of multiple particles. However, in the mechanism of controlling particle motion, it is still necessary to change the light pressure gradient received by the particle, so that the particle can move like a straight line, deflection or vortex. the

In addition, although optical clamping technology is of great help in manipulating micron-sized particles, at present, it is only necessary to control the particles on the focal plane through laser focusing, so it is impossible to flexibly control the movement of particles in space. the

Contents of the invention

The invention relates to an optical clamp control device, which enables the laser focus position to be changed arbitrarily in space through the matching use of a mirror group and a variable focus lens group. the

The invention provides an optical clamp control device, which comprises: a light source, an objective lens and a focus adjustment unit. The focus adjustment unit is arranged between the light source and the objective lens, and includes a mirror group and a zoom lens group. The mirror group includes at least one mirror, which is set in a rotatable manner to change the exit angle of the light from the light source after it hits the mirror. The zoom lens group includes at least one zoom lens, and the zoom lens is arranged corresponding to the surface mirror. Among them, by rotating the mirror or changing the focal length of the zoom lens, the light can be moved through the focal position of the objective lens on the focal plane or the front or rear side of the focal plane. the

According to the optical clamp control device of the present invention, the mirror group includes a plurality of mirrors arranged in a rotatable manner. the

According to the optical clamp control device of the present invention, the mirrors of the mirror group are arranged in multiple groups. the

According to the optical clamp control device of the present invention, wherein the zoom lens group includes a plurality of zoom lenses. the

According to the optical clamp control device of the present invention, the zoom lenses of the zoom lens group are arranged in multiple groups. the

According to the optical clamp control device of the present invention, the zoom lens is a liquid lens or an electro-liquid lens. the

According to the optical clamp control device of the present invention, the mirror group is a digital mirror device (digital mirror device, DMD). the

According to the optical clamp control device of the present invention, the variable focus lens group is disposed between the mirror group and the objective lens. the

The optical clamp control device according to the present invention further includes: a first lens group located between the mirror group and the variable focus lens group; and a second lens group located between the variable focus lens group and the objective lens. the

According to the optical clamp control device of the present invention, it also includes: a polarization beam splitter, located between the mirror group and the variable focus lens group; and a quarter-wavelength plate, arranged between the mirror group and the polarizer between beamsplitters. the

According to the optical clamp control device of the present invention, wherein the light source is a laser source. the

The present invention also provides an optical clamp control device, which includes: a light source, an objective lens and a focus adjustment unit. The focus adjustment unit is arranged between the light source and the objective lens, and includes a mirror group. The mirror group has at least one row of mirrors, and the row of mirrors includes a plurality of rotatable mirrors. These mirrors are used to change the exit angle of the light from the light source after it hits the mirror group, and by turning these mirrors, the light moves through the focal position of the objective lens on the focal plane of the objective lens. the

According to the optical clamp control device of the present invention, the focus adjustment unit further includes a variable focus lens group corresponding to the surface mirror group. the

According to the optical clamp control device of the present invention, the variable focus lens group is disposed between the mirror group and the objective lens. the

The optical clamp control device according to the present invention further includes: a first lens group located between the mirror group and the variable focus lens group; and a second lens group located between the variable focus lens group and the objective lens. the

According to the optical clamp control device of the present invention, it also includes: a polarization beam splitter, located between the mirror group and the variable focus lens group; and a quarter-wavelength plate, arranged between the mirror group and the polarizer between beamsplitters. the

According to the optical clamp control device of the present invention, wherein the mirror group is a digital micromirror element. the

The present invention also provides an optical clamp control device, which includes: a light source, an objective lens and a focus adjustment unit. The focus adjustment unit is arranged between the light source and the objective lens, and includes at least one row of zoom lenses. Wherein, by changing the focal length of each zoom lens, the light of the light source is moved to the front side or the back side of the focal plane through the focus position of the objective lens. the

According to the optical clamp control device of the present invention, the focus adjustment unit further includes at least one row of mirrors corresponding to the row of zoom lenses. the

According to the optical clamp control device of the present invention, the array of zoom lenses is located between the surface mirror and the objective lens. In order to make the above content of the present invention more obvious and understandable, the preferred embodiments are specifically cited below, and in conjunction with the accompanying drawings, the detailed description is as follows:

Description of drawings

Fig. 1 shows a schematic diagram of an optical clamp control device according to a preferred embodiment of the present invention. the

FIG. 2 shows a schematic diagram of changing the focal length of the zoom lens in FIG. 1 . the

FIG. 3 shows a schematic diagram of the rotation angle of the mirror in FIG. 1 . the

4 to 5 show schematic diagrams of changing the focal length of the zoom lens in FIG. 3 . the

Detailed ways

The optical clamp control device disclosed in this embodiment includes a light source, an objective lens, and a focus adjustment unit. The focus adjustment unit includes a mirror group and a variable focus lens group, wherein the focus adjustment unit is located between the light source and the objective lens. By rotating the mirror of the mirror group or changing the zoom lens group, the focus position of the light on the focal plane of the objective lens is changed, or the focus position of the light on the front side or rear side of the focal plane is changed. The following figures detail the design of the optical clamp control device. the

Referring to FIG. 1 , it shows a schematic diagram of an optical clamp control device according to a preferred embodiment of the present invention. As shown in FIG. 1 , the optical clamp control device 1 includes a light source 100 , an objective lens 110 and a focus adjustment unit, wherein the focus adjustment unit is arranged between the light source 100 and the objective lens 110 . The focus adjustment unit includes a mirror group 120 and a zoom lens group 130 . The mirror group 120 includes at least one mirror, which is rotatably arranged to change the exit angle of the light from the light source 100 after it hits the mirror. The zoom lens group 130 includes at least one zoom lens, and the zoom lens is arranged corresponding to the mirror. Wherein, by rotating the surface mirror or changing the focal length of the zoom lens, the focus position of the light through the objective lens can be moved on the focal plane FP or the front side or the rear side of the focal plane FP. The light source 100 in this embodiment is, for example, a laser source. Since laser light has high directivity and high intensity, it is very suitable for use as the light source 100 . the

Regarding the configuration of the focus adjustment unit, its variable focus lens group 130 is preferably located between the mirror group 120 and the objective lens 110 . As shown in Figure 1, the optical clamp control device 1 also includes a first lens group 140, a second lens group 150, a polarized beam splitter (polarized beam splitter) 160 and a quarter wave plate (quarter wave plate) 170 . The first lens group 140 is located between the mirror group 120 and the zoom lens group 130 , and the second lens group 150 is located between the zoom lens group 130 and the objective lens 110 . The polarizing beam splitter 160 is located between the mirror group 120 and the first lens group 140 , and the quarter wave plate 170 is disposed between the mirror group 120 and the polarizing beam splitting mirror 160 . the

In this embodiment, the mirror group 120 includes a plurality of rotatable mirrors 121 - 123 , and the zoom lens group 130 includes a plurality of zoom lenses 131 - 133 . Wherein the mirrors 121-123 and the zoom lenses 131-133 are all arranged in a row. The mirror group 120 can be a digital micromirror device (DMD), which has a plurality of rotatable small mirrors to adjust the outgoing angle of the light arbitrarily. The zoom lenses 131 - 133 are, for example, liquid lenses, or preferably electro-liquid lenses. The electro-liquid lens will change its thickness when different voltages are applied, so when the electro-liquid lens is used as a component of the variable focus lens group 130 , its own focal length can be adjusted. the

When the laser light (linearly polarized light) emitted from the light source 100 is incident from one side of the polarizing beam splitter 160 , the polarizing beam splitter 160 will deflect the laser light and emit it to the quarter-wavelength plate 170 . After the laser light passes through the quarter-wavelength plate 170 , it will be irradiated to the mirrors of the mirror group 120 , such as the mirror 121 . When the laser light is reflected by the mirror 121 and passes through the quarter-wavelength plate 170 again, it will enter the polarization beam splitter 160 again. Then, the laser light passes through the first lens group 140 , the zoom lens 133 of the zoom lens group 130 and the second lens group 150 in sequence. Finally, the laser light will be focused on the focal plane FP of the objective lens 110 (such as the focus position M1). Since any mirror on the mirror group 120 can be rotated, and each zoom lens on the zoom lens group 130 can also change its focal length, the laser beam can be arbitrarily manipulated on the focal plane FP, the front side or the rear side of the focal plane FP. focus position. the

Referring to FIG. 2 , it shows a schematic diagram of changing the focal length of the zoom lens in FIG. 1 . As shown in FIG. 2 , the thickness of the zoom lens 133 is individually reduced. Since the focal length of the zoom lens is inversely proportional to the thickness, the smaller the thickness of the zoom lens 133 , the larger its focal length will be. After the laser light passes through the second lens group 150 and the objective lens 110 , the laser light will be focused on the rear side of the focal plane FP (for example, the focus position M2 ). Conversely, if the thickness of the zoom lens 133 becomes larger, the focal length of the zoom lens 133 will become smaller, so that the laser light is focused on the front of the focal plane of the objective lens. In this way, as long as the thickness of any zoom lens on the zoom lens group 130 is adjusted, the focus position of the laser light can be changed so that it falls on the front side or the back side of the focal plane FP. the

Referring next to FIG. 3 , it shows a schematic diagram of the rotation angle of the mirror in FIG. 1 . As shown in FIG. 3 , only the mirror 121 of the mirror assembly 120 is rotated clockwise by a small angle. Because the surface mirror 121 changes the outgoing angle of the laser light irradiated on the surface mirror 121, the laser light is obliquely incident on the polarization beam splitter 160, and passes through the first lens group 140, the zoom lens 133, and the second lens group 150 in sequence. With the objective lens 110 , finally the laser light will be focused on other positions on the focal plane FP (such as the focus position M3 ). the

Of course, the rotation angle of the mirror on the mirror group 120 and the focal length of the zoom lens of the zoom lens group 130 can also be adjusted at the same time. Referring to FIGS. 4-5 , which show schematic diagrams of changing the focal length of the zoom lens in FIG. 3 . When the mirror 121 rotates an angle, the laser light has been changed from the original focus position M1 to the focus position M3 (see FIG. 1 and FIG. 3 ). Now, if the thickness of the zoom lens 133 is adjusted to be thicker, as shown in FIG. 4 , the focus position of the laser light will be transformed to the front side of the focal plane FP (for example Focus position M4). Conversely, if the thickness of the zoom lens 133 is reduced, as shown in FIG. 5 , the focus position of the laser light will be transformed to the rear side of the focal plane FP (for example, the focus position M5). the

Although the lens group 120 of the present embodiment is described with the mirrors 121-123 arranged in rows, and the zoom lens group 130 is described with the zoom lenses 131-133 arranged in rows, the present invention is not limited to this. In other embodiments, the mirror group 120 and the zoom lens group 130 may include multiple mirrors and zoom lenses. Preferably, these mirrors or zoom lenses are arranged in multiple groups on the plane, and one mirror is set corresponding to one zoom lens. In this way, the optical clamp control device 1 can not only control the focus of the laser light on the front side or the back side of the focal plane FP, but also control the focus position of the laser light on the focal plane FP to move up, down, left, and right along different paths. the

In addition, although the optical clamp control device 1 of the present embodiment is illustrated with the variable focus lens group 130 , in other embodiments, it is also possible to use only ordinary optical lenses to operate with a rotatable mirror. For example, a plurality of lenses can be arranged on a mechanism that can move relative to the mirror group 120 . In this way, by driving the lens to move away from the mirror group 120 or close to the mirror group 120 through the mechanism, the focus position of the laser light can also be changed to the front side or the rear side of the focal plane. the

The optical clamp control device 1 of this embodiment is, for example, applied to control particle motion in a microfluidic system. Adjust the design parameters of each component in the optical clamp control device 1 according to the needs of actual operation, such as selecting a lens group with an appropriate focal length and its quantity, objective lens, polarized beam splitter, etc., so that the laser focus position is within a predetermined range . During operation, the detection specimen loaded with particles is set within the predetermined range, and the focus position of the laser in space can be changed by adjusting the rotation angle of the mirror and changing the focal length of the focus lens. Particles caught by the clip move with it. the

The optical clamp control device disclosed in the above embodiments of the present invention enables the optical clamp control device to arbitrarily change the focus position of the laser light in space through the matching operation of the mirror group and the lens group. the

In summary, although the present invention has been disclosed as above with preferred embodiments, they are not intended to limit the present invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be defined by the appended claims. the

Description of main component symbols

1: Optical clamp control device 100: Light source

110: Objective lens 120: Mirror group

121～123: Mirror 130: Zoom lens group

131～133: zoom lens 140: first lens group

150: second lens group 160: polarized beam splitter

170: Quarter Wavelength Plate FP: Focal Plane

M1～M5: focus position

Claims (10)

1. A light clamp control device (1), comprising: A light source (100), used to generate light; an objective lens (110) having a focal plane; and A focus adjustment unit is arranged between the light source (100) and the objective lens (110), and the focus adjustment unit includes: The mirror group (120) includes at least one mirror, and the mirror is rotatably arranged to change the exit angle of the light after it hits the mirror; and A variable focus lens group (130), including at least one zoom lens, the zoom lens is arranged corresponding to the surface mirror, and the focal length of the zoom lens can be changed, wherein the variable focus lens group (130) is arranged on the surface Between the lens group (120) and the objective lens (110); The optical clamp control device (1) also includes: a first lens group (140), located between the mirror group (120) and the variable focus lens group (130); and a second lens group (150 ), located between the variable focus lens group (130) and the objective lens (110); Wherein, the mirror and the zoom lens are arranged in a row, and by rotating the mirror or changing the focal length of the zoom lens, the focus position of the light through the objective lens (110) is at the focal point. The plane moves either anteriorly or posteriorly to the focal plane. 2. The optical clamp control device (1) according to claim 1, wherein the mirror group (120) comprises a plurality of mirrors arranged in a rotatable manner. the 3. The optical clamp control device (1) according to claim 2, wherein the mirrors of the mirror group (120) are arranged in multiple groups. 4. The optical clamp control device (1) according to claim 1, wherein the variable focus lens group (130) comprises a plurality of zoom lenses. 5. The optical clamp control device (1) according to claim 4, wherein the zoom lenses of the zoom lens group (130) are arranged in multiple groups. 6. The optical clamp control device (1) according to claim 1, wherein the zoom lens is a liquid lens or an electro-liquid lens. 7. The optical clamp control device (1) according to claim 1, wherein the mirror group (120) is a digital micromirror element. 8. The optical clamp control device (1) according to claim 1, wherein the light source (100) is a laser source. 9. An optical clamp control device (1), comprising: A light source (100), used to generate light; an objective lens (110) having a focal plane; and A focus adjustment unit is arranged between the light source (100) and the objective lens (110), the focus adjustment unit includes a mirror group (120), and the mirror group (120) has at least one row of mirrors, the The array of mirrors includes a plurality of rotatable mirrors, and the mirrors are used to change the outgoing angle of the light after it irradiates the mirror group (120), wherein the focus adjustment unit also includes a zoom lens Group (130), set corresponding to the mirror group (120), the variable focus lens group (130) is arranged between the mirror group (120) and the objective lens (110); The optical clamp control device (1) also includes: a first lens group (140), located between the mirror group (120) and the variable focus lens group (130); and a second lens group (150 ), located between the variable focus lens group (130) and the objective lens (110); Wherein, the surface mirror and the zoom lens are arranged in a row, and by rotating the surface mirror, the focus position of the light through the objective lens (110) is moved on the focal plane. 10. The optical clamp control device (1) according to claim 9, wherein the mirror group (120) is a digital micromirror element. the

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