Changfeng Fu, Xinke Wang, Yicheng Zhang, Jiaxin Ju, Wei Fan, Xiaobo Yan and Lianfu Han
{"title":"Design and theoretical analysis of a tunable bifunctional metasurface absorber based on vanadium dioxide and photoconductive silicon","authors":"Changfeng Fu, Xinke Wang, Yicheng Zhang, Jiaxin Ju, Wei Fan, Xiaobo Yan and Lianfu Han","doi":"10.1039/D4DT02563F","DOIUrl":null,"url":null,"abstract":"<p >A tunable bifunctional metasurface absorber based on vanadium dioxide (VO<small><sub>2</sub></small>) and photoconductive silicon (PSi) is proposed in a terahertz (THz) band. When the conductivities of VO<small><sub>2</sub></small> (<em>σ</em><small><sub>vo<small><sub>2</sub></small></sub></small>) and PSi (<em>σ</em><small><sub>PSi</sub></small>) are 10 S m<small><sup>−1</sup></small> and 1 × 10<small><sup>5</sup></small> S m<small><sup>−1</sup></small>, the designed absorber has a function of dual-broadband absorption. The absorptivity rate of over 90% is in the dual-broadband of 2.47–3.71 THz and 8.90–10.62 THz, corresponding to relative bandwidths (RBs) of 40.13% and 17.62%, respectively. When <em>σ</em><small><sub>vo<small><sub>2</sub></small></sub></small> and <em>σ</em><small><sub>PSi</sub></small> are equal to 2 × 10<small><sup>5</sup></small> S m<small><sup>−1</sup></small> and 1 × 10<small><sup>5</sup></small> S m<small><sup>−1</sup></small>, 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 the dual- and single-broadbands is manipulated by changing <em>σ</em><small><sub>PSi</sub></small>. An 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 performances are maintained within the incident angles of 55° and 60°, which also possess polarization insensitivity. The proposed absorber has a potential application value in multifunctional devices such as modulation, sensing and electromagnetic (EM) stealth.</p>","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":" 1","pages":" 133-143"},"PeriodicalIF":3.5000,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Dalton Transactions","FirstCategoryId":"92","ListUrlMain":"https://pubs.rsc.org/en/content/articlelanding/2025/dt/d4dt02563f","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
引用次数: 0
Abstract
A tunable bifunctional metasurface absorber based on vanadium dioxide (VO2) and photoconductive silicon (PSi) is proposed in a terahertz (THz) band. When the conductivities of VO2 (σvo2) and PSi (σPSi) are 10 S m−1 and 1 × 105 S m−1, the designed absorber has a function of dual-broadband absorption. The absorptivity rate of over 90% is in the dual-broadband of 2.47–3.71 THz and 8.90–10.62 THz, corresponding to relative bandwidths (RBs) of 40.13% and 17.62%, respectively. When σvo2 and σPSi are equal to 2 × 105 S m−1 and 1 × 105 S m−1, 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 the dual- and single-broadbands is manipulated by changing σPSi. An 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 performances are maintained within the incident angles of 55° and 60°, which also possess polarization insensitivity. The proposed absorber has a potential application value in multifunctional devices such as modulation, sensing and electromagnetic (EM) stealth.
期刊介绍:
Dalton Transactions is a journal for all areas of inorganic chemistry, which encompasses the organometallic, bioinorganic and materials chemistry of the elements, with applications including synthesis, catalysis, energy conversion/storage, electrical devices and medicine. Dalton Transactions welcomes high-quality, original submissions in all of these areas and more, where the advancement of knowledge in inorganic chemistry is significant.