Graphene multi-resonant structure-based polarization wideband-independent terahertz wave absorber

Abstract

A graphene multi-resonant structure-based polarization wideband-independent terahertz wave absorber relates to a terahertz wave absorber. The graphene multi-resonant structure-based polarization wideband-independent terahertz wave absorber comprises a five-layer structure, wherein the five-layer structure is sequentially a periodic graphene multi-resonant mesh-shaped structural layer, an upper dielectric layer, a bias layer, a lower dielectric layer and a metal layer from top to bottom, horizontal period and a longitudinal period of a unit structure of the periodic graphene multi-resonant mesh-shaped structural layer both are in square shapes, the graphene multi-resonant structure comprises square graphene, a one fourth round disc and a rectangular strip, the square graphene is formed by connecting middle points of four edges of a periodic square shape, the one fourth round disc has radius of four corners of the periodic square shape, and the rectangular strip has width on four edges of the periodic square shape. The graphene multi-resonant structure-based polarization wideband-independent terahertz wave absorber is simple in structure, universality and can be used for absorbing anelectromagnetic wave of an intermediate infrared band, a far infrared band, visible light or other bands by scale conversion.

Description

technical field [0001] The invention relates to a terahertz wave absorber, in particular to a polarization-independent broadband terahertz wave absorber based on a graphene multi-resonance structure. Background technique [0002] Terahertz waves refer to electromagnetic waves with a frequency range of 0.1 to 10THz. They are in the transition zone between macroelectronics and microphotonics between microwave and infrared. Compared with the more mature microwave and light wave technologies, they form a relatively backward The "terahertz gap," the last frequency window in the electromagnetic spectrum to be fully studied. With the development of terahertz source and detection technology, various terahertz devices have also developed rapidly in recent years. Terahertz absorber is a very important terahertz functional device, which can be widely used in terahertz sensing, imaging, detection, stealth and other fields. In 2008, Landy et al. published a paper (Perfect Metamaterial ...

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Problems solved by technology

In 2008, Landy et al. published a paper (Perfect Metamaterial Absorber) on Physical Review Letters and designed a perfect metamaterial absorber. In recent years, people have studied a variety of new structures of metamaterial absorbers, but most of them are perfect. The working bandwidth of the absorber is relatively narrow, and some even can only achieve the effect of close to full absorption at a single frequency point

However, the current common broadband terahertz absorbers still have the problems of complex structure, difficulty in bias application, narrow absorption rate relative to bandwidth, or sensitivity to the polarization of incident waves.

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