Method for capturing and screening graphene-coated particles above substrate in tunable manner through linearly-polarized planar optical wave

Abstract

Provided is a method for capturing and screening graphene-coated particles above a substrate in a tunable manner through linearly-polarized planar optical wave, comprising the following steps: placing graphene-coated particles above a substrate slab, damaging the symmetric distribution of a Poynting vector around the graphene-coated particles, making the total Poynting vector on the graphene-coated particles not be zero, and producing a non-gradient optical force; and then, changing the direction and size of the total Poynting vector on the graphene-coated particles by changing the Fermi energy level of graphene, and further changing the direction and size of the non-gradient optical force applied by the total Poynting vector to the graphene-coated particles to adjust the motion trajectory of the graphene-coated particles in an incident light field, wherein the Fermi energy level of graphene is changed by changing an external electric field, temperature, intensity of injected light, thickness of graphene, and the like, and further, the dielectric coefficient and conductivity of graphene are changed.

Description

technical field [0001] The invention relates to a method for tunable trapping and screening of graphene-wrapped 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 generat...

AI Technical Summary

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 polariz...

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