Three-dimensional photonic crystal and application thereof

Abstract

The invention relates to a three-dimensional photonic crystal and application thereof in the field of optical devices. The three-dimensional photonic crystal comprises a first periodic layer, a defectlayer and a second periodic layer which are stacked in sequence; the number of periods of the first period layer is at least two, the first period layer comprises at least two base layers which are sequentially staggered and stacked together, each base layer is provided with a plurality of uniformly distributed through holes, and in each base layer, the distance between every two adjacent throughholes is equal and recorded as a; the defect layer is a base layer with an incoming line defect; the structure and period number of the second period layer are the same as those of the first period layer. According to the three-dimensional photonic crystal, periodic changes are formed through multilayer staggered stacking of the base layers of the two-dimensional structure in space, so that the three-dimensional photonic crystal has a complete photonic band gap, and propagation of optical signals of a specific waveband in a three-dimensional space can be limited. The three-dimensional photonic crystal is insensitive to the incident angle of an incident signal.

Description

technical field [0001] The invention relates to the field of optical path adjustment devices, in particular to a three-dimensional photonic crystal and its application. Background technique [0002] A photonic crystal is a material structure in which dielectric materials are periodically arranged in space, and is usually an artificial crystal composed of two or more materials with different dielectric constants. Photonic crystals have a strong and flexible ability to control the propagation of light. The introduction of point defects in the photonic crystal structure can build optical resonant microcavities, or introduce line defects to create photonic crystal optical waveguides. Optical resonators and optical waveguide structures based on photonic crystal point defects and line defects can be used to construct optical switches, optical operation logic devices, and micro-laser resonators, and have the advantages of miniaturization and integration, and can adapt to future te...

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Problems solved by technology

[0004] However, since the photonic bandgap of two-dimensional photonic crystals is limited to two-dimensional space, an effective forbidden band cannot be formed in three-dimensional space. The incident light wave of two-dimensional photonic crystals has an out-of-plane wave vector, which needs to rely on the interface between the flat medium and the air medium. Total reflection is used to constrain the propagation of light waves in the two-dimensional photonic crystal plane wave, that is, the two-dimensional photonic crystal is more sensitive to the incident angle of the input optical signal (high dependence)

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