A broadband tunable terahertz absorber based on double heterocomposite structure layer

Abstract

The invention discloses a broadband tunable terahertz absorber based on a double-heterogeneous composite structure layer. The cross section of a terahertz absorber unit is square, the terahertz absorber unit sequentially comprises a base layer, a metal film layer, a dielectric I, a composite structure layer I, a dielectric layer II and a composite structure layer II from down to up, wherein the composite structural layer I is composed of a dielectric layer embedded with four square metal film structures of different sizes, and the composite structural layer II is composed of four different sizes of ring phase change dielectric structures. The broadband tunable terahertz absorber is advantaged in that lateral and longitudinal superposition of the multiple resonant structures is utilized, broadband absorption of the terahertz absorber is achieved, conductivity of phase change materials in the composite structural layer II is changed through external excitation such as temperature and illumination, modulation of the absorption bandwidth is completed, and the tunable property of the terahertz absorber is achieved.

Description

technical field [0001] The invention relates to the field of terahertz technology, and in particular to the invention discloses a broadband tunable terahertz absorber based on a double heterogeneous composite structure layer. Background technique [0002] Terahertz waves refer to electromagnetic waves between microwave and infrared, with a frequency range of 0.1THz-10THz. Since terahertz waves are in a special spectral range and have many superior properties, studies have found that they have important application prospects in wireless communication, radar imaging, and environmental detection. Compared with terahertz radiation source and detection technology, the research on terahertz functional devices is relatively lagging behind, such as modulators, polarizers and couplers, especially absorbers. The reason is that there is a lack of natural and suitable terahertz strong absorbing materials in nature, which hinders and restricts the development and application of terahert...

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Problems solved by technology

However, at present, terahertz metamaterial absorbers still have disadvantages such as poor tuning effect, low absorption rate, and narrow bandwidth. Therefore, the present invention proposes a broadband tunable terahertz absorber based on double heterogeneous composite structure layer

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