Three-dimensional photonic crystal and its application

Abstract

The invention relates to a three-dimensional photonic crystal and its application in the field of optical devices. The three-dimensional photonic crystal includes a first periodic layer, a defect layer, and a second periodic layer stacked in sequence; the number of periods of the first periodic layer is at least 2, and the first periodic layer includes at least 2 base layers that are sequentially dislocated and stacked together, each A number of evenly distributed through-holes are provided on each base layer. In each base layer, the distance between two adjacent through-holes is equal and denoted as a; the defective layer is the base layer where line defects are introduced; the second periodic layer’s Both the structure and the number of periods are the same as the first period layer. The above-mentioned three-dimensional photonic crystal forms periodic changes through multi-layer dislocation stacking in space through the base layer of the two-dimensional structure, so that the three-dimensional photonic crystal has a complete photonic band gap, which can limit the propagation of optical signals of specific wavelength bands in three-dimensional space. This 3D photonic crystal is insensitive to the angle of incidence of the incoming 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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