Magnetic control photonic crystal filter based on Bi-doped composite rare earth iron garnet

Abstract

The invention discloses a magnetic control photonic crystal filter based on a Bi-doped composite rare earth iron garnet. The magnetic control photonic crystal filter comprises a body, wherein the bodyadopts a tetragonal lattice structure, circular dielectric columns are arranged in a matrix on the body, linear waveguides are arranged at two ends of the body respectively, a resonant cavity is formed between the two linear waveguides, the resonant cavity comprises a resonant cavity inner layer and a resonant cavity outer layer, the resonant cavity inner layer is sleeved in the resonant cavity outer layer, the resonant cavity inner layer is configured to be magnetic dielectric columns arranged in four circular structures which are mutually sleeving, the resonant cavity outer layer is configured to be magnetic dielectric columns arranged in a circular structure, second circular dielectric columns are arranged at connecting positions of the outer side of the resonance cavity and the linearwaveguides, and the circular dielectric columns and the second circular dielectric columns are made of a Si material. The magnetic control photonic crystal filter has the advantages of adjustable magnetic control, flexible application, high adaptability, high transmittance, high Q value and the like, is mainly used for magnetically tunable filtering in the visible light communication band, and has a potential application value in the field of high-speed optical communication.

Description

technical field [0001] The invention relates to a magnetically controlled photonic crystal filter based on a Bi-doped composite rare earth iron garnet, and belongs to the technical field of the magnetically controlled photonic crystal filter. Background technique [0002] At present, a photonic crystal is a structure in which the dielectric constant changes periodically in space. There is a photonic forbidden band in the medium, and only electromagnetic waves in the non-forbidden band can propagate in it; the filter is used to filter the frequency point of a specific frequency in the signal or the The frequency outside the frequency point is effectively filtered to obtain a signal of a specific frequency; the compact structure of optical communication devices based on photonic crystals, as well as the great application prospects in future optical integrated chips and all-optical communication networks, photonic crystal filters are An important part of the wavelength division...

AI Technical Summary

Problems solved by technology

The first type is an electronically controlled photonic crystal filter. By injecting liquid crystal into the dielectric column, that is, when the external electric field is increased, the molecules of the liquid crystal will turn, so that the director of the liquid crystal will also change direction, so that the refraction of the liquid crystal material The frequency is also adjusted accordingly, this type of filter has been reported, and the response speed is not fast enough

Different from the first type of electronically controlled photonic crystal filter, the second type of magnetically controlled photonic crystal filter mainly uses a magnetic medium, and the filter can be adjusted by adjusting the refractive index of the magnetic medium by an external magnetic field, but most of the current reports They are all used in the terahertz band, less used in the optical communication band, and rarely used in filter devices

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