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Device and method for feeding back cooling particles in double-beam light trap

A dual-beam, optical trap technology, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of increasing the modulation complexity of the system, increasing the system complexity, detecting noise and interference, etc., to reduce the adjustment complexity, The effect of avoiding the influence of noise and simplifying the structure

Inactive Publication Date: 2021-03-12
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the implementation of particle feedback cooling will increase the complexity of the system
If too many components are added for feedback cooling, the volume of the system will be increased, the complexity of system modulation will be increased, and it will also easily bring additional noise and interference to the detection

Method used

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  • Device and method for feeding back cooling particles in double-beam light trap
  • Device and method for feeding back cooling particles in double-beam light trap
  • Device and method for feeding back cooling particles in double-beam light trap

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] step 1):

[0049] like figure 2 As shown, the particles deviate from the equilibrium position in the direction of the vertical optical axis due to random thermal motion. At this time, due to the deviation of the particles, the optical field after the light trap captures and detects light after passing through the optical trap changes compared with when the particles are in the equilibrium position. The particle detection module receives the light captured and detected by the optical trap, demodulates the particle displacement signal according to the change of the received light field, and transmits it to the signal processing module. According to the theory and experimental experience, the standard deviation of the displacement of particles from the equilibrium position due to thermal motion in the vertical optical axis direction is between ten nanometers and hundreds of nanometers.

[0050] Step 2):

[0051] like image 3 As shown, the signal processing module rece...

Embodiment 2

[0064] step 1):

[0065] like Figure 4 As shown, the particle deviates from the equilibrium position along the optical axis due to random thermal motion. At this time, the light captured and detected by the optical trap is due to the deviation of the particle, and the light field after passing through the optical trap changes compared with when the particle is at the equilibrium position. The particle detection module receives the light captured and detected by the optical trap, demodulates the particle displacement signal according to the change of the received light field, and transmits it to the signal processing module. According to theory and experimental experience, the standard deviation of the displacement of particles from the equilibrium position due to thermal motion along the optical axis is between ten nanometers and several microns.

[0066] Step 2):

[0067] like Figure 5 As shown, the signal processing module receives the particle displacement signal uploa...

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Abstract

The invention discloses a device and method for feeding back cooling particles in a double-beam light trap. Light emitted by a light source is divided into two beams of capture light through a beam splitter, one beam of capture light is focused through a lens to serve as detection light, the other beam of capture light passes through an optical power modulator and a light beam direction adjustingmodule and then is focused by the lens to participate in capture, and captured particles are fed back and cooled during capture; a particle displacement detection module receives the captured light passing through the light trap, extracts displacement information and sends the displacement information to a signal processing module; the signal processing module receives and analyzes the displacement information and then adjusts the displacement information through the light beam direction adjusting module and the optical power modulator, so that the particles return to balanced positions, movement of the particles is restrained, and the purpose of cooling the particles is achieved. The method for capturing, detecting and cooling the large-size particles by using the single laser is providedfor the first time, the optical path structure of the cooling particles in the double-beam optical trap is greatly simplified, the influence of a complex structure on detection is avoided, the size of a system is reduced; and the device and method have practical application value.

Description

technical field [0001] The invention relates to a device and method for feedback cooling particles in optical tweezers, in particular to a device and method for feedback cooling particles applied in a double-beam optical trap. Background technique [0002] In 1971, American physicist Ashkin and others used a lens to weakly focus a beam of laser light irradiated vertically upwards, and for the first time optically stabilized suspended glass particles with a diameter of 20um. In 1986, he discovered that after strongly focusing a single laser beam, particles can be stably captured without relying on gravity. This technique was named optical tweezers. In 2018, Ashkin won the Nobel Prize in Physics for his invention of optical tweezers. The principle of optical tweezers is that the strongly focused laser beam produces a force that always points to the focus on the medium particles, and its magnitude is proportional to the electric field gradient, so it is called gradient force. ...

Claims

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Application Information

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IPC IPC(8): G01N15/00G01B11/02G01B11/00
CPCG01B11/00G01B11/02G01N15/00
Inventor 杨健宇李楠陈杏藩胡慧珠傅振海高晓文刘承
Owner ZHEJIANG UNIV