Method for producing tunable non-gradient optical force on surface of liquid crystal material and metal multi-layer core-housing by slanting incidence-light

Abstract

A method for producing a tunable non-gradient optical force on the surface of a liquid crystal material and metal multi-layer core-housing by slanting incidence-light is provided. The method comprising destroying symmetric distribution of Poynting vectors around the multi-layer core-housing, enabling a total Poynting vector on the multi-layer core-housing not to be zero and producing a non-gradient optical force; and then, by changing an arranging direction (the direction of a liquid crystal molecular axis) of liquid crystal molecules in liquid crystal materials, changing the direction and the size of the total Poynting vector on the multi-layer core-housing, thus changing the direction and the size of the non-gradient optical force acted on the multi-layer core-housing by the total Poynting vector thus to regulate a moving track of the multi-layer core-housing in an incidence light field, and carrying out tunable capture and screening on nanoscale molecules adhered onto the surface of the multi-layer core-housing. Through methods such as illumination, electrification, heating and pressurization, the direction of the liquid crystal molecular axis of the liquid crystal materials in the liquid crystal material / metal multi-layer core-housing is altered.

Description

technical field [0001] The invention relates to a method for generating tunable non-gradient optical force on the surface of a liquid crystal material metal multilayer core-shell with oblique incident light, which can be applied to the fields of biology, medicine, nanometer control 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 sti...

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 polarized or elliptically polarized light cannot be tuned, and it is difficult to capture nano-sized achiral molecules. A method for trapping and screening achiral nanometer-sized molecules by non-gradient optical force generated by linearly polarized oblique incident light with the advantages of simple system, convenient operation, ultra-sensitivity, ultra-fast, active tuning, etc., can be used in biology, medicine and field of nanomanipulation

Images