Method for tunably capturing and screening topological insulator particles above substrate through utilizing linearly polarized planar light waves

Abstract

The invention relates to a method for tunably capturing and screening topological insulator particles above a substrate through utilizing linearly polarized planar light waves. According to the method, the topological insulator particles are arranged above the flat substrate plate; the symmetrical distribution of Poynting vectors around the topological insulator particles is destroyed, so that the total Poynting vector on the topological insulator particles is not zero, and therefore, a non-gradient optical force can be generated; the quantum state of a topological insulator is changed, so that the direction and magnitude of the total Poynting vector on the topological insulator particles can be changed, and therefore, the direction and magnitude of the non-gradient optical force which is acted on the topological insulator particles by the total Poynting vector can be changed, and as a result, the movement tracks of the topological insulator particles in an incident light field can be adjusted and controlled, and tunable capture and screening of nanoscale molecules attached to the surfaces of the topological insulator particles can be realized; and reversible quantum phase transition of the topological insulator from topological non-trivialness to topological trivialness can be realized through modes such as illumination, electrification, heating and pressurization.

Description

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