偏振不敏感石墨烯基可调谐超表面太赫兹双频吸收器

IF 2.1 4区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Nanotechnology Pub Date : 2024-12-11 DOI:10.1109/TNANO.2024.3515459

Niten Kumar Panda;Sraddhanjali Mohapatra;Sudhakar Sahu

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引用次数: 0

摘要

本文提出了一种电子可调谐的超表面宽带吸收器，其石墨烯基单元电池设计用于较低太赫兹（0.1太赫兹- 10太赫兹）区域。石墨烯的表面等离子体和可控电导使其成为这一目的的理想选择。在0.682 ~ 1.798 THz（90%分数带宽）和4.187 ~ 4.947 THz（16%分数带宽）范围内观察到双宽带吸收（$ >$90%吸收率）。吸收器对偏振光和45°以内的斜入射不敏感。该单元电池包括聚酰亚胺衬底（介电常数：3.5，损耗正切：0.0024）上的双椭圆交叉石墨烯单层，背面是超薄金层。等离子体共振由四个半圆槽引入，引起4.15到4.95太赫兹的吸收。通过传输线模型和有限元仿真验证了吸光性能。通过门控电位、载流子弛豫时间和费米能量变化来研究可调性。

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Polarization Insensitive Graphene Based Tunable Metasurface Terahertz Dual-Band Absorber

This article presents an electronically tunable metasurface wideband absorber with a graphene-based unit cell designed for the lower terahertz (0.1 THz– 10 THz) region. Surface plasmonics and the controllable conductance of graphene make it ideal for this purpose. Dual wideband absorption (

$ >$

90% absorptivity) was observed from 0.682 to 1.798 THz (90% fractional bandwidth) and 4.187 to 4.947 THz (16% fractional bandwidth). The absorber is insensitive to polarizations and oblique incidences up to 45°. The unit cell comprises a double elliptical-cross graphene monolayer on a polyimide substrate (dielectric constant: 3.5, loss tangent: 0.0024) backed by an ultra-thin gold layer. Plasmonic resonance, introduced by four semicircular slots, causes absorption from 4.15 to 4.95 THz. Absorption properties were verified through a transmission line model and finite element method (FEM) simulations. Tunability is investigated via gating potential, carrier relaxation time, and Fermi energy variations.

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来源期刊

IEEE Transactions on Nanotechnology 工程技术-材料科学：综合

CiteScore

4.80

自引率

8.30%

发文量

审稿时长

8.3 months

期刊介绍： The IEEE Transactions on Nanotechnology is devoted to the publication of manuscripts of archival value in the general area of nanotechnology, which is rapidly emerging as one of the fastest growing and most promising new technological developments for the next generation and beyond.