A Photonic Crystal Bending Waveguide Structure Based on Transforming Medium

Abstract

The invention relates to a photonic crystal curved waveguide structure based on transformation media. The structure comprises a photonic crystal right-angle waveguide with a periphery isolation layer (PEC) and is characterized in that the photonic crystal right-angle waveguide is composed of a photonic crystal waveguide area (ABEF), a transformation photonic crystal waveguide 1 area (ABC') and a transformation photonic crystal waveguide 2 area (AC'D'), the transformation photonic crystal waveguide 1 area (ABC') and the transformation photonic crystal waveguide 2 area (AC'D') are background medium triangular areas, the photonic crystal waveguide area (ABEF) is transformed to the background medium triangular areas, and then a photonic crystal waveguide curving space area is formed. According to the structure, the low-loss right-angle optical waveguide with the transformation media and two-dimensional photonic crystal combined structure is adopted to control light wave transmission, low-loss or even loss-free light wave transmission is achieved at curved positions, and the structure is suitable for the condition that curving angles are quite large.

Description

technical field [0001] The invention belongs to the technical field of optical components, in particular to a photonic crystal bending waveguide structure based on a conversion medium. Background technique [0002] In modern integrated optical systems, the optical waveguide structure is an indispensable photon transmission line structure, and the bent optical waveguide structure can effectively control the transmission of light waves along different paths. Photonic crystals are artificial microstructures formed by periodic arrangements of media with different refractive indices. When electromagnetic waves propagate in them due to Bragg scattering, the electromagnetic waves will be modulated to form an energy band structure. This energy band structure is called photonic energy band. There may be a band gap between the photon energy bands, that is, the photonic band gap. Since no state exists in the bandgap, electromagnetic waves whose frequency falls in the bandgap are forbi...

AI Technical Summary

Problems solved by technology

However, the structure of the pure photonic crystal waveguide at the bend needs special design, especially when the bend angle is large, this design is quite difficult

[0004] At present, photonic crystal bending waveguides are limited to the design of one-dimensional or two-dimensional structures, and the requirements of low-loss transmission can only be achieved when the bending angle is relatively small.

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