Method for capturing and screening particle above topological insulator substrate in tunable manner through linearly-polarized planar optical wave

Abstract

The invention provides a method for capturing and screening particle above a topological insulator substrate in a tunable manner through linearly-polarized planar optical wave, comprising the following steps: damaging the symmetric distribution of a Poynting vector around a particle, making the total Poynting vector on the particle not be zero, and producing a non-gradient optical force; and then, changing the direction and size of the total Poynting vector on the particle by changing the quantum state of a topological insulator substrate slab, further changing the direction and size of the non-gradient optical force applied by the total Poynting vector to the particle to adjust the motion trajectory of the particles in an incident light field, and then, capturing and screening nano-sized molecules attached to the surface of the particle in a tunable manner, wherein reversible quantum phase transition of the topological insulator substrate slab from topological non-mediocrity to topological mediocrity is realized by means of lighting, electrifying, heating, pressurizing, an additional magnetic field, and the like.

Description

technical field [0001] The invention relates to a method for tunable trapping and screening of particles above a topological insulator 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 ge...

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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 (that is, the incident light must be circularly polarized or elliptically polarized) and the limitation of the screening object (that is, the nanoscale molecule must have chiral structure), the gradient optical force generated by circularly polarized or elliptically polarized light is not tunable, and it is difficult to capture nano-sized achiral molecules, etc., and provide a simple system, convenient operation, ultra-sensitive, ultra-fast, The non-gradient optical force generated by linearly polarized plane light waves, which has the advantages of active tuning, traps and screens achiral nanometer-sized molecules on top of a topological insulator substrate plate, which can be used in the fields of biology, medicine, and nanomanipulation

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