Tunable capturing and screening method of linear polarization planar optical waves for liquid crystal material particle above substrate

Abstract

The invention relates to a tunable capturing and screening method of linear polarization planar optical waves for a liquid crystal material particle above a substrate. The technical scheme of the tunable capturing and screening method comprises the steps of arranging the liquid crystal material particle above a substrate plate, damaging symmetrical distribution of Poynting vectors around the liquid crystal material particle, enabling the total Poynting vector on the liquid crystal material particle not to be zero, and generating a non-gradient optical force; and then changing the direction and the size of the total Poynting vector on the liquid crystal material particle through changing the arrangement direction of a liquid crystal molecule in a liquid crystal material, that is, the direction of a liquid crystal molecular axis, so as to regulate and control the movement track of the liquid crystal material particle in an incident field, thereby carrying out tunable capturing and screening on nano-sized molecules attached to the surface of the liquid crystal material particle. The direction of the liquid crystal molecular axis in the liquid crystal material is changed through the modes of illumination, electrification, heating, pressurization and the like.

Description

technical field [0001] The invention relates to a method for tunable trapping and screening of liquid crystal material particles above a substrate by linearly polarized plane light waves, which can be applied to the fields of biology, medicine, nanometer manipulation and the like. Background technique [0002] Optical trapping and screening of tiny objects has always been a research hotspot in the field of optics. Optical gradient force plays an important role in various optical trapping technologies, such as optical tweezers and optical bundling through optical gradient force. However, optical gradient forces have the disadvantages of complex devices, non-tunable devices, and difficulty in trapping and screening nanometer-sized molecules. In 2008, Ward, T.J. et al proposed that the optical gradient force generated by circularly polarized light can capture and separate chiral molecules with nanometer size. However, the circularly polarized incident light still needs to be ...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the complexity of the incident light source in the traditional method of trapping and screening nano-sized molecules using gradient optical force (that is, the incident light must be a circle polarized or elliptically polarized), the limitations of screening objects (that is, nano-sized molecules must have a chiral structure), the gradient optical force generated by circularly polarized or elliptically polarized light cannot be tuned, and it is difficult to capture nano-sized achiral molecules. A non-gradient optical force generated by linearly polarized plane light waves, which has the advantages of simple system, convenient operation, ultra-sensitivity, ultra-fast, active tuning, etc., traps and screens achiral nanometer-sized molecules located above the substrate plate. In the fields of biology, medicine and nanomanipulation

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