Tunable Local Hollow Beam Optical Tweezers System Based on Dual-beam Laser Trap

Abstract

The invention relates to a tunable local area hollow beam optical tweezers system based on a double-beam laser trap. The system comprises a laser source, a beam shaping assembly, a beam split assembly, a reflector assembly, a hollow beam generation assembly and a hollow beam convergence assembly. The hollow beam generation assembly comprises a first bi-cone lens and a second bi-cone lens. The hollow beam convergence assembly comprises a first parabolic curved mirror and a second parabolic curved mirror. Beams emitted by the laser source are shaped through utilization of the beam shaping assembly. The beams are split into first beams and second beams through utilization of the beam split assembly. The first beams and the second beams pass the reflector assembly, are incident on the first bi-cone lens and the second bi-cone lens and then pass the first parabolic curved mirror and the second parabolic curved mirror. The beams converged by the first parabolic curved mirror and the second parabolic curved mirror form tunable local area hollow beams. The system provided by the invention is simple in structure, is convenient for operation and is low in cost. Controllability over particulates in air is improved.

Description

technical field [0001] The invention relates to the technical field of applied optics, in particular to a tunable local hollow beam optical tweezers system of a double-beam laser trap. Background technique [0002] An optical tweezers system is an optical system that uses optical traps to move tiny particles. Optical tweezers technology uses laser beams to achieve non-mechanical contact capture and manipulation of micro- and nano-sized particles, without mechanical damage to the particles, and thus hardly affects the biological environment around the particles. In general, the optical trap uses a high numerical aperture (NA) objective lens to strongly focus the laser light. The more focused the laser is, the greater the gradient force of the optical trap is, which is more conducive to trapping tiny particles. In the field of optics, the local hollow beam has a local three-dimensional closed dark hollow area. Since the local hollow beam has a three-dimensional closed dark h...

AI Technical Summary

Problems solved by technology

[0003] At present, the existing local hollow beam optical tweezers system is a local hollow beam generated by a single beam optical trap, which limits the working distance and stability of the system

At the same time, for particles of different sizes, different devices need to be replaced for capture, and the device structure is complex and expensive

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