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Multifunctional inverse direction optical tweezers

A reverse light and multi-functional technology, applied in the field of laser optical tweezers, can solve the problems of slow time response, low, complex stability, etc., and achieve the effects of fast control of degrees of freedom, convenient manufacture, and low cost

Inactive Publication Date: 2009-12-16
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the separation of light propagation paths, this method is more complicated and less stable
The liquid crystal nematic spatial light modulator can control the phase and amplitude of the incident light in real time to change the intensity distribution of the strong converging light field, but the light utilization rate is not high and the time response is slow
In addition, due to the depolarization effect of the strong converging light field, the spatially uniform linearly polarized light in the strong converging optical system, the intensity distribution of the focal spot of the light field is not symmetrical on the beam propagation cross section, which is unfavorable for the three-dimensional stable capture of particles factor

Method used

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  • Multifunctional inverse direction optical tweezers
  • Multifunctional inverse direction optical tweezers
  • Multifunctional inverse direction optical tweezers

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The steps for determining the functional reverse optical tweezers of the present invention are as follows:

[0030]1. Select the caliber of the quartz crystal and the size of other components in the system according to the caliber of the laser beam to ensure that the beam can pass through the system effectively. The caliber is 40mm. Select high numerical aperture lens, numerical aperture NA=0.98.

[0031] 2. Determine the specific radius of each ring of the diffractive optical element according to the number of captured particles. Select the number of dark spots at the focal point of 3. refer to Figure 4 , the radii of the inner and outer rings of the outer ring area 201 and the central area 203 are obtained through optimization simulation calculations, respectively R 203内 = 0mm, R 203外 =18.47mm; R 201内 =25.47mm, R 201外 = 40mm. Simultaneously reducing the area of ​​the outer ring area 201 and the central area 203, that is, increasing the area of ​​the 202 area w...

Embodiment 2

[0036] The difference between embodiment 2 and embodiment 1 is that the number of dark spots is 5, and the inner and outer radii of the outer ring area 201 and the central area 203 of the selected diffractive optical element are respectively: R 203内 = 0mm, R 203外 =15.21mm; R 201内 =26.85mm, R 201外 = 40mm.

Embodiment 3

[0038] The difference between embodiment 3 and embodiment 1 is that the number of dark spots is 7, and the inner and outer radii of the outer ring area 201 and the central area 203 of the selected diffractive optical element are respectively: R 203内 = 0mm, R 203外 =12.03mm; R 201内 =27.59mm,R 201外 = 40mm.

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Abstract

A pair of multifunctional reverse optical tweezers for multi-particle capture and transmission is characterized in that the structure thereof comprises a spatial axis symmetrical polarized light generator, a diffractive optical element and a high numerical aperture lens, which are sequentially arranged along the forward direction of light beams; the diffractive optical element and the high numerical aperture lens are controlled and driven by a piezoelectric ceramic driver as a whole body. With the characteristics of simple structure, strong maneuverability and low cost, the pair of multifunctional reverse optical tweezers can capture and transmit micro-particles with the micro-scale and the low refraction rate, neural cold atoms and metal particles, etc.

Description

technical field [0001] The invention relates to laser optical tweezers, in particular to a multifunctional reverse optical tweezers. The use of lasers to capture particles at the microscopic scale, especially the capture and transmission of low-refractive index particles, neutral cold atoms and metal particles, is applicable to atomic optics, molecular optics, life sciences, etc. Background technique [0002] "Optical tweezers" is based on the mechanical effect of laser, and is a physical tool for monitoring and manipulating particles at the microscopic scale through the optical potential well formed when a strong convergent light field interacts with particles. This use of light beams to achieve non-mechanical contact capture of particles will not cause mechanical damage, and is a "remote control" operation. Optical tweezers are divided into two types: standard optical tweezers and reverse optical tweezers. Standard optical tweezers use the bright spot in the center of the...

Claims

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Application Information

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IPC IPC(8): G02F1/00G21K1/00
Inventor 张艳丽李小燕王斌张燕朱健强
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI