Design and theoretical analysis of a tunable bifunctional metasurface absorber based on vanadium dioxide and photoconductive silicon

IF 4.3 3区材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

ACS Applied Electronic Materials Pub Date : 2024-10-31 DOI:10.1039/d4dt02563f

Changfeng Fu, Xinke Wang, Yicheng Zhang, Jiaxin Ju, Wei Fan, Xiaobo Yan, Han lianfu

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引用次数: 0

Abstract

A tunable bifunctional metasurface absorber based on vanadium dioxide (VO2) and photoconductive silicon (PSi) is proposed in terahertz (THz) band. When the conductivities of VO2 (vo2) and PSi (PSi) are 10 S/m and 1×105 S/m, the designed absorber has a function of dual-broadband absorption. The absorptivity over 90% is in the dual-broadband of 2.47-3.71 THz and 8.90-10.62 THz, corresponding relative bandwidths (RBs) are 40.13% and 17.62%, respectively. When vo2 and PSi are equal to 2×105 S/m and 1×105 S/m, the proposed design has a function of single-broadband absorption. More than 90% absorptivity is achieved in 4.69-7.72 THz (RB=48.83%). Furthermore, the absorptivity under dual- and single-broadband is manipulated by changing PSi. Impedance matching theory, equivalent transmission-line (TL) model and electric field distribution are used to reveal the tunable bifunctional absorption mechanism. The influences of structure parameters, polarization mode and incidence angle on the dual- and single-broadband absorption are investigated. The dual- and single-broadband absorption performance is maintained within the incident angles of 55° and 60°, which also possesses polarization insensitivity. The proposed absorber has a potential application value in multifunctional devices such as modulation, sensing and electromagnetic (EM) stealth.

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基于二氧化钒和光导硅的可调双功能超表面吸收器的设计与理论分析

在太赫兹（THz）波段，提出了一种基于二氧化钒（VO2）和光导硅（PSi）的可调谐双功能元表面吸收器。当二氧化钒（vo2）和光导硅（PSi）的电导率分别为 10 S/m 和 1×105 S/m 时，所设计的吸收器具有双宽带吸收功能。在 2.47-3.71 太赫兹和 8.90-10.62 太赫兹的双宽带内，吸收率超过 90%，相应的相对带宽（RB）分别为 40.13% 和 17.62%。当 vo2 和 PSi 分别等于 2×105 S/m 和 1×105 S/m 时，所提出的设计具有单频带吸收功能。在 4.69-7.72 THz（RB=48.83%）范围内，吸收率超过 90%。此外，还可通过改变 PSi 来操纵双频和单频带下的吸收率。利用阻抗匹配理论、等效传输线（TL）模型和电场分布揭示了可调双功能吸收机制。研究了结构参数、极化模式和入射角对双频和单频吸收的影响。在入射角为 55° 和 60° 时，双频和单频吸收性能保持不变，同时还具有极化不敏感性。所提出的吸收器在调制、传感和电磁隐身等多功能设备中具有潜在的应用价值。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Applied Electronic Materials Multiple-

CiteScore

7.20

自引率

4.30%

发文量

567