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A dual-beam optical tweezers system based on spatial light modulator

A spatial light modulator and dual-beam technology, applied in the field of optical instruments, can solve problems such as low precision, lack of versatility, and inability to control a single beam, so as to improve the application range and avoid interference phenomena

Inactive Publication Date: 2018-03-06
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at many problems that the previous spatial light modulator should not be able to control a single beam in multi-beam optical tweezers, the precision is low, the flexibility is poor, and there is no versatility, a new type of spatial light modulator is proposed. Dual beam optical tweezers system

Method used

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  • A dual-beam optical tweezers system based on spatial light modulator
  • A dual-beam optical tweezers system based on spatial light modulator
  • A dual-beam optical tweezers system based on spatial light modulator

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Embodiment

[0038] The dual-beam optical tweezers system proposed in the present invention will be further described below in combination with embodiments, but the present invention is not limited thereto.

[0039] A laser beam with a wavelength of 1064 nanometers exits the laser 1 and enters the optical isolator 2 . The optical isolator 2 only allows the laser along the positive direction of the optical axis, that is figure 1 The direction indicated by the middle arrow passes in one direction, and the diameter of the outgoing beam is 2 mm.

[0040] The light beam after passing through the optical isolator 2 is incident on the first telescope system 3 . The first telescope system 3 collimates and expands the light beam to reduce the divergence angle of the light beam, so that the light energy is distributed more uniformly in the section perpendicular to the optical axis. In this embodiment, the magnification of the first telescopic system is 2.5 times. The diameter of the laser beam af...

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Abstract

The invention discloses a spatial light modulator-based dual-beam optical tweezers system. The system includes a laser, a first telescope system, a half wave plate, a first reflector, a spatial light modulator, a quarter-wave plate, a focusing lens, a second reflector, a second telescope system, an objective lens and a sample stage which are arranged sequentially along an optical path, wherein the half wave plate is used for adjusting the ratio of horizontal polarized light and vertical polarized light in a received beam, the first reflector is used for reflecting the received beam to a corresponding modulation area on the spatial light modulator, and the spatial light modulator is provided with two modulation areas loaded with different phase image information; the beam is subjected to phase modulation once, and then, the phase-modulated beam passes through the quarter-wave plate and the focusing lens, and thereafter is reflected by the second reflector; the reflected beam passes through the focusing lens and the quarter-wave plate again, and arrives at the other modulation region of the spatial light modulator, and thereafter, passes through the second telescope system and the objective lens sequentially, and arrives at the sample stage. With the spatial light modulator-based dual-beam optical tweezers system of the invention adopted, the application range of the optical tweezers can be greatly extended, and experiment accuracy can be improved.

Description

technical field [0001] The invention relates to the field of optical instruments, the field of micro-nano operation and the field of molecular biology, in particular to a dual-beam optical tweezers system based on a spatial light modulator. Background technique [0002] In the focused beam, the gradient force and scattering force of the beam will interact to form an optical potential well. When the gradient force is greater than the scattering force, this gradient force potential well can stably bind the particles in the range of Mie scattering and Rayleigh scattering, that is optical tweezers. In order to generate sufficient gradient force, a high-energy laser beam is usually focused by an optical microscope objective lens with a large numerical aperture. In order to eliminate the system noise and signal drift of optical tweezers, most optical tweezers systems adopt a dual-optical tweezers design to shield environmental noise and Brownian motion. The differential detectio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B21/32G21K1/00
CPCG02B21/32G21K1/006
Inventor 李旸晖来邻芮丛珊周辉王乐
Owner CHINA JILIANG UNIV
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