Terahertz photonic crystal band-pass filter with bow-shaped resonant cavity structure

Abstract

The invention requests a protection of a terahertz photonic crystal band-pass filter with a bow-shaped resonant cavity structure. The terahertz photonic crystal band-pass filter comprises two-dimensional photonic crystals, horizontal input waveguides, a resonant cavity and vertical output waveguides, wherein the two-dimensional photonic crystals are in tetragonal lattice periodic distribution; thehorizontal input waveguides and the vertical output waveguides are arranged in the two-dimensional photonic crystals; a row of dielectric cylinders at two adjacent sides of the waveguides are rectangular dielectric cylinders; the bow-shaped resonant cavity is arranged in the intersected position of the input and output waveguides; the resonant cavity consists of two inside dielectric cylinders and three scattering dielectric cylinders; when TeraHertz waves are input into the resonant cavity from the horizontal input waveguides, TeraHertz waves conforming to the resonant frequency of the resonant cavity are coupled into the resonant cavity, and are output from a lower port of the vertical output waveguide; the low-loss broadband filtering in the frequency range being 375 to 425GHz is realized.

Description

technical field [0001] The invention belongs to a terahertz photonic crystal band-pass filter, adopts a novel bow-shaped resonant cavity structure, and relates to the technical field of a terahertz passive device and terahertz wave communication. Background technique [0002] Terahertz spectrum usually refers to the spectrum area between 0.1THz and 10THz, and it is the last new frequency band that has not been allocated and developed. Terahertz wave is a new kind of radiation wave with many unique advantages, which provides opportunities for the development of cutting-edge technology in the future. Photonic crystals are a new type of optical microstructure whose dielectric constant changes periodically with space. Its most basic feature is that it has a photonic band gap, and photons falling into this band gap frequency range cannot propagate. Therefore, a photonic crystal is equivalent to a natural blocking filter. When a certain defect or dielectric disorder is introduce...

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Problems solved by technology

Using metal plating on the surface of dielectric pillars in two-dimensional photonic crystals can also effectively reduce transmission loss, but there are still high ohmic losses, and the processing technology is quite complicated

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