Photo-thermal effect simulation method for a surface plasmon waveguide

Abstract

The invention discloses a photo-thermal effect simulation method for a surface plasmon waveguide. The method comprises the following steps: firstly, determining an edge value problem of a light fieldpart based on an electric field vector wave equation and an electromagnetic boundary condition, discretizing a light field analysis area by adopting tetrahedral vector edge elements, establishing a light field finite element matrix equation according to a Galerkin method, and solving to obtain electric field distribution of a three-dimensional surface plasmon waveguide; then, heat generated by anelectric field is used as a heat source; determining an edge value problem of a thermal field part based on a transient heat conduction equation and a thermal boundary condition; a tetrahedral scalarnode element is adopted to discretize a thermal field analysis area, an unconditionally stable backward difference format is adopted to discretize a time domain, a thermal field finite element matrixequation of each time step is established according to a Galerkin method, and transient temperature distribution of the three-dimensional surface plasmon waveguide is obtained through solving. The method has the advantages of being high in simulation precision, wide in application range and high in solving efficiency.

Description

technical field [0001] The invention relates to a surface plasmon simulation method, in particular to a three-dimensional numerical simulation method of the photothermal effect of a surface plasmon waveguide. Background technique [0002] The integrated optical circuit is composed of tiny photonic devices. However, because the size of photonic devices is limited by the diffraction limit, it is difficult to nanometerize and integrate them. The use of surface plasmons can break through the diffraction limit, thereby realizing the nanometerization and integration of photonic devices. A surface plasmon is a surface electromagnetic wave mode propagating at the interface of two media with opposite permittivity signs. Due to its surface-wave properties, beams can be confined to the subwavelength scale. Therefore, optical waveguides based on surface plasmons, that is, surface plasmon waveguides, have great potential in fabricating highly integrated photonic chips. [0003] When l...

AI Technical Summary

Problems solved by technology

[0004] Using experiments to study the photothermal effect of surface plasmon waveguides is not only expensive but also inefficient. playing an increasingly important role in

The actual surface plasmon waveguide usually has a three-dimensional complex structure, and the two-dimensional approximation method cannot obtain accurate results well, and the traditional analytical method cannot obtain the distribution of the optical and thermal fields

Images