Single-band and three-band switchable filter based on vanadium dioxide phase change metamaterial

Abstract

The invention discloses a single-band and three-band switchable filter based on a vanadium dioxide phase change metamaterial. The filter comprises an outer open resonance ring, an inner long branch open U-shaped ring, a first vanadium dioxide gap block body, a second vanadium dioxide gap block body, an inner short branch open U-shaped ring and a dielectric layer. The outer open resonance ring, theinner long branch open U-shaped ring, a first vanadium dioxide gap, a second vanadium dioxide gap and the inner short branch open U-shaped ring are located on the top layer, and the dielectric layeris located below a resonance ring pattern and the vanadium dioxide gaps. By changing the temperature, the vanadium dioxide material is subjected to phase change to form a metal state, the resonance characteristic of the structural unit is changed, and the switching from a three-passband filter before the phase change of vanadium dioxide to a single-passband filter after the phase change of vanadium dioxide is realized. The single-band and three-band switchable filter based on a vanadium dioxide phase change metamaterial has the advantages of compact structure, low cost, excellent performance and the like, and meets the application requirements of terahertz imaging and terahertz communication systems.

Description

technical field

[0001] The invention relates to a terahertz filter, in particular to a single-band and triple-band switchable filter based on an alumina phase-change metamaterial. Background technique

[0002] Terahertz generally refers to electromagnetic waves with a frequency of 0.1 to 10 THz, corresponding to a wavelength of 0.03 mm to 3 mm, and its frequency range is located at the intersection of electronics and photonics. In recent years, the terahertz wave between the millimeter wave and infrared light, which has been developed quite maturely on the electromagnetic spectrum, is undoubtedly a brand-new research field, and it has great potential value in all aspects. For a long time, due to the lack of effective terahertz wave generation and detection methods, compared with traditional microwave technology and optical technology, people have little understanding of the nature of electromagnetic radiation in this band, so that this band has become the terahertz wave in t...

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