High-quality-factor terahertz ring dipole metamaterial

Abstract

The invention discloses a high-quality-factor terahertz ring dipole metamaterial. The high-quality-factor terahertz ring dipole metamaterial comprises a first metal pattern layer and a second metal pattern layer, wherein the first metal pattern layer and the second metal pattern layer are prepared on both sides of a dielectric layer respectively. The first metal pattern layer consists of three rectangles 1 (length 78-82 microns * width 15-17 microns) distributed in an x-axis negative half axis area and three rectangles 2 (length 62-66 microns * width 15-17 microns) distributed in an x-axis positive half axis area, six rectangular patterns are positioned at the positions with the distances of 23-25 microns from the center of a circle, and the rectangular patterns are arranged at 60-degree intervals along the tangential direction of the circle; the pattern of the second metal pattern layer is such formed that the first metal pattern layer rotates by 180 degrees along a Z axis, and the two metal pattern layers are overlapped with the center of the circle in a z direction. By using the ring dipole metamaterial of a metal-medium-metal structure, the front incident intensity can be effectively strengthened, the ring dipole resonance has a high quality factor Q value greater than 12, the dielectric thickness is changed between 5 microns and 30 microns, the ring dipole resonance frequency can be adjusted between 1.0 THz and 1.3 THz, and the material can be used for preparing terahertz devices such as terahertz sensors, frequency modulators and filters.

Description

technical field [0001] The invention relates to a high-quality factor terahertz ring dipole metamaterial, which adopts a "metal-medium-metal" structure, has high normal incidence intensity, a large ring dipole resonance quality factor Q value, and a resonant frequency that varies with the thickness of the medium. It can be used to prepare terahertz devices such as terahertz sensors, frequency modulators and filters. Background technique [0002] Terahertz (THz) waves are electromagnetic waves that lie between microwaves and far infrared. In the 1990s, a series of breakthroughs were made in terahertz emission sources and detectors, which triggered the rapid development of terahertz science and technology. The development of free electron lasers and ultrafast laser technology provides a stable and reliable excitation light source for the generation of terahertz pulses, enabling the rapid development of the research on the generation mechanism, detection and application techno...

AI Technical Summary

Problems solved by technology

Ring dipole metamaterials have been theoretically studied and experimentally confirmed in the microwave and light wave bands, but have not been reported in the terahertz band.

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