对偏振不敏感的石墨烯基带状缺口太赫兹频率选择性吸收器。

Applied optics Pub Date : 2024-05-20 DOI:10.1364/AO.518847
Asal Malekara, Changiz Ghobadi, Javad Nourinia
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引用次数: 0

摘要

本文介绍了一种新型极化不敏感的石墨烯基频率选择性吸收器(FSA),它带有一个反射凹口,专为太赫兹应用而设计。所提出的结构具有两个吸收带,分别位于中央反射带的两侧。该设计由一个有损频率选择表面(FSS)、一个带金属衬底的带阻 FSS 和中间的空气隔层组成。第一步是开发宽带吸收器结构,利用石墨烯作为有损层中的吸收材料,实现宽带吸收特性。随后,通过在吸收器结构中集成阻带无损 FSS 层,引入反射带。整体结构显示出两个不同的吸收带,在 0.30 至 0.57 和 0.67 至 0.90 太赫兹的频率范围内,吸收率超过 80%。同时,在 0.60 太赫兹处还出现了一个反射凹口。大量模拟评估了所设计 FSA 的性能。所提出的结构在高达 40 度的斜入射条件下表现出稳定性,并可通过调整石墨烯的化学势来调整吸收规格。值得注意的是,FSA 反射器具有无需复杂、高成本三维结构和焊接块状电阻器等优点。
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Polarization-insensitive graphene-based band-notched frequency selective absorber at terahertz.

This paper introduces a new polarization-insensitive graphene-based frequency selective absorber (FSA) with a reflective notch designed for terahertz applications. The proposed structure features two absorption bands on either side of a central reflection band. The design composes a lossy frequency selective surface (FSS), a bandstop FSS with a metal backing, and an air spacer between. A wideband absorber structure is developed in the first step, leveraging graphene as an absorbent material in the lossy layer to achieve wideband absorptive characteristics. Subsequently, a reflection band is introduced by integrating a bandstop, lossless FSS layer into the absorber structure. The overall structure demonstrates two distinct absorption bands, characterized by absorptivity exceeding 80% within the frequency ranges of 0.30 to 0.57 and 0.67 to 0.90 THz. Simultaneously, a reflection notch is achieved at 0.60 THz. Extensive simulations assessed the performance of the designed FSA. The proposed structure exhibits stability under oblique incidence up to 40 deg and allows tunable absorption specifications by adjusting the chemical potential of graphene. It is noteworthy that the FSA reflector offers advantages such as eliminating the need for complicated, high-cost 3-D structures and welding of the lumped resistors.

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