Finite surface band gap topologic insulator-based material interface light beam IF displacement system

Abstract

The invention discloses a method for calculating Imbert-Fedorov displacement of reflected light beam on a topologic insulator of a finite surface band gap based on an energy flux method. The method comprises the following steps of 1: building single interface models of a general isotropic medium and the isotropic finite band gap topologic insulator; 2: determining boundary and initial conditions;3: calculating transmission coefficients and reflection coefficients on single interfaces of the general medium and a chiral medium; 4: calculating energy fluxes in all directions by using a correctedenergy flux method; and 5, calculating the Imbert-Fedorov (IF) displacement. The transverse displacement characteristics of the single interface models of the general medium and the finite band gap topologic insulator can be accurately analyzed; the topologic insulator of the finite surface band gap is relatively close to a theoretical model of an actual topologic insulator material, and has relatively high application values as a test model; a new way is provided for IF displacement control; and an optical method is provided for measuring topologic magnetoelectric polarization properties.

Description

technical field [0001] The invention belongs to the technical field of optical information, and in particular relates to a modified energy flow method to obtain an IF (Imbert-Fedorov) displacement system on a topological insulator interface of a common medium-limited surface band gap. (transverse displacement of reflected beam) Background technique [0002] When the electromagnetic wave is totally reflected on the interface of two homogeneous media, the center of the reflected wave will be displaced relative to the center of the incident wave, that is, the Goos- (GH) lateral displacement and Imbert-Fedorov (IF) lateral displacement perpendicular to the incident surface. Theoretical and experimental research on GH and IF displacement has always been an important means to explore the interaction between light waves and physical media. Through the study of displacement characteristics It is possible to understand the impact of the incident mode, polarization state and medium ...

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Problems solved by technology

[0005] Although many people have studied the special electromagnetic properties of topological insulators, their studies are all in the case of infinite bandgap, and there are very few studies on the finite surface bandgap of topological insulators. Chen studied the finite surface bandgap The effect of gapped topological insulators on the Casimir force, but there is no study on the characteristic displacement of the surface of topological insulators with finite surface bandgap

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