Device for realizing light-induced track rotation based on double-light beam misalignment method and method

Abstract

The invention belongs to the optical micromanipulation system technical field and relates to a device for realizing light-induced track rotation based on a double-light beam misalignment method and a method. The device is composed of two sets of capture light generating systems, a transparent sample pool, a lighting system and a measurement system; the lighting system and the measurement system are adopted as auxiliary systems, so that the rotation track of particles can be measured; the two sets of capture light generating systems are located at two sides of the transparent sample pool and respectively generate Gaussian beams with the same power; the Gaussian beams are inputted into the transparent sample pool from the two sides of the transparent sample pool and irradiate the particles along the tangential direction of the particles to be captured; the lighting system below the transparent sample pool is utilized to provide lighting; and the measurement system above the transparent sample pool is utilized to perform observation and measure the rotation track and rotation amplitude of the particles, and at same time, measure the track rotation speed of the particles. The device and the method have the advantages of high control precision, simple and convenient operation, simple experiment system and the like.

Description

technical field [0001] The invention belongs to the technical field of optical micro-manipulation systems, and in particular relates to a device and method for realizing photo-induced orbital rotation of mesoscopic particles based on a double-beam misalignment method. Background technique [0002] The mesoscopic scale refers to the scale between the microcosmic and the macroscopic and capable of maintaining quantum coherence. The size of the mesoscopic scale is related to the properties of materials and the physical environment, and is generally on the order of nm to μm. The motion of mesoscopic particles is one of the basic problems in physics and fluid mechanics. Controlling the motion of mesoscopic particles is very important for the research of biological cells, biomacromolecules and nanomotors, as well as the precise measurement of material properties in the microscopic field. significance. [0003] Photoinduced rotation is a mesoscopic-scale particle angle manipulatio...

AI Technical Summary

Problems solved by technology

[0005] At present, the light-induced orbital rotation methods of mesoscopic particles mainly include misalignment optical circulation control method (Nobuyuki Watanabe, KozoTaguchi. Theoretical Study of Optical Vibration and Circulation of a Microsphere. Key Engineering Materials Vol516: 563-568, 2012.), fluid optical trap control method (BlakelyJT, GordonR, SintonD.Flow-dependentoptofluidicparticletrappingandcirculation[J].LabonaChip8(8):1350-1356,2008.)、旋转椭圆光斑法(RaktimDasgupta,SamarendraK.Mohanty&PradeepK.Gupta.Controlledrotationofbiologicalmicroscopicobjectsusingopticallinetweezers.BiotechnologyLetters25:1625–1628,2003.)等,这三 This method essentially forms a force field for orbital rotation by changing the direction, power, and intensity distribution of the captured beam, so as to realize the optical orbital manipulation of particles. The misalignment optical cycle control method uses the periodic change of the captured laser power to achieve Photoinduced orbital rotation of trapped particles, the disadvantage of this method is the need for continuous periodic control of laser light intensity

The fluid optical trap control method is to use the driving force of the fluid and the scattering force of light to act on the particles together, so as to realize the photoinduced orbital rotation of the mesoscopic particles. control

The rotating elliptical spot method is to place a cylindrical prism in the capture light path to form an elliptical spot, and then rotate the cylindrical prism to rotate the elliptical spot to realize the continuous and controllable orbital rotation of the captured particles. This method has the following disadvantages: (1) The size of the spot determines The particle size can be manipulated, and increasing the size of the optical trap requires higher trapping beam power; (2) The rotation of the spot depends on the rotation of the cylindrical prism, and the continuous rotation of the prism is not easy to control

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