Photonic crystal annular cavity terahertz filter

Abstract

The invention relates to a photonic crystal annular cavity terahertz filter, which is characterized in that the photonic crystal annular cavity terahertz filter comprises two-dimensional square-lattice-structured photonic crystals 1, an input waveguide 2, scattering dielectric cylinders 3, an annular cavity 4, a single square dielectric block 5 and an output waveguide 6, wherein the two-dimensional square-lattice-structured photonic crystals 1 are dielectric cylinder type silicon photonic crystals which are periodically distributed along the X-Z plane; the input waveguide 2 is formed by removing a row of the dielectric cylinders 3 from the two-dimensional square-lattice-structured photonic crystals 1; the annular cavity 4 is formed in the two-dimensional square-lattice-structured photonic crystals 1; the annular cavity 4 comprises the single square dielectric block 5 and the scattering dielectric cylinders 3; the single square dielectric block 5 rotates to a certain degree clockwise; and the annular cavity is spaced from each of the input waveguide 2 and the output waveguide 6 by two rows of the dielectric cylinders 3.

Description

technical field [0001] The invention is a novel photonic crystal annular cavity terahertz filter, which adopts a novel annular cavity structure including a single square dielectric block, and relates to the technical fields of terahertz wave communication and optical information processing. Background technique [0002] Terahertz waves (Terahertz, THz) usually refer to electromagnetic waves in the 0.1THz to 10THz band, which is the last frequency window that has not been fully understood and utilized. The special electromagnetic spectrum position of THz wave endows it with many superior characteristics. Combining photonic crystal technology and THz technology can design filters that meet the needs of future THz communications. Compared with the traditional THz filter, the photonic crystal-based THz filter has many advantages, and also has the functions of wavelength selection, noise filtering, gain equalization, etc., so it has a good application prospect in THz communicati...

AI Technical Summary

Problems solved by technology

[0003] In THz communication, the photonic crystal THz filter is usually realized by two methods. One is to introduce point defects into the photonic crystal to realize filtering. The filter is very different, and the insertion loss is large, so this kind of filter cannot meet the requirements of high-speed THz communication; while the other is realized by introducing suitable point defects and corresponding line defects into photonic crystals with complex structures. The existing This type of filter can achieve dual-wavelength filtering at most. At this time, if you want to achieve filtering with more wavelengths, you can only connect this type of filter in series, but this will have a great impact on the filtering efficiency.

Images