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Design of broadband and five-narrowband dual-function tunable absorbers based on vanadium dioxide and graphene

二氧化二钒 宽带 窄带 石墨烯 材料科学 对偶(语法数字) 双重功能 光电子学 纳米技术 计算机科学 电信 薄膜 计算机图形学(图像) 文学类 艺术 轮廓
作者
Yanfei Liu,Yang Bai,Qiannan Wu,Xiaoyu Liu
出处
期刊:Journal of The Optical Society of America B-optical Physics [Optica Publishing Group]
卷期号:42 (5): 973-973 被引量:6
标识
DOI:10.1364/josab.553674
摘要

A switchable ultra-wideband terahertz absorber based on vanadium dioxide and graphene is proposed, comprising a gold layer, a PMI dielectric layer, a vanadium dioxide layer, and a graphene surface layer. Leveraging the phase transition properties of vanadium dioxide and graphene, this absorber exhibits switchable performance between ultra-wideband and five-narrowband near-perfect absorption states. The model was simulated and analyzed using finite element analysis; the simulation results demonstrate that when vanadium dioxide is in its metallic state and the Fermi energy level of graphene is 0.1 eV, the absorber achieves over 90% absorption within the frequency range of 4.8–17.6 THz, resulting in a broadband absorption width of 12.8 THz. Furthermore, the absorber displays insensitivity to both TE and TM polarization modes, as well as a broad range of incidence angle tolerance. When vanadium dioxide transitions to its insulating state and the graphene Fermi energy level is set to 0.4 eV, the absorber switches to a narrowband state, achieving absorption of greater than 90% at 1.9, 5.2, and 15.3 THz across three narrowbands. Due to its high symmetry, the proposed absorber exhibits strong polarization insensitivity and incident angle stability. The broadband maintains consistent absorption performance at incidence angles up to 60°, and the stability at 1.9 and 5.2 THz at incidence angles of 70° when switching to narrowband remains consistent. When the absorber is switched to a narrowband, this corresponds to a maximum Q of 900 and a maximum sensitivity of refractive sensing of 0.875 THz/RIU. Additionally, it offers the benefits of compact size, ultra-wideband and ultra-narrowband capabilities, and high Q-factor. The proposed absorber holds significant potential for applications in multifunctional devices, electromagnetic stealth, and optoelectronic switches. The broadband absorber maintains consistent absorption performance at incidence angles up to 60°, while the narrowband absorber demonstrates stable absorption at 1.9 and 5.2 THz even at incidence angles up to 70°. This stability across a wide range of angles further enhances the absorber’s applicability in practical scenarios.
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