Zishan Yang , Anqi Li , Zhitao Wang , Feng Huang , Zhaoyang Chen
{"title":"A terahertz sensor based on tunable patterned graphene metamaterial absorber with high absorptivity and sensitivity","authors":"Zishan Yang , Anqi Li , Zhitao Wang , Feng Huang , Zhaoyang Chen","doi":"10.1016/j.micrna.2025.208371","DOIUrl":null,"url":null,"abstract":"<div><div>Terahertz metamaterial sensors hold significant promise in various fields, including biomedicine, agricultural production, non-destructive testing, and national defense security. This study introduces a metamaterial biomedical sensor based on patterned graphene absorber. The absorption spectrum obtained through simulation calculation in the CST microwave studio shows three distinct absorption peaks at 4.40 THz, 5.92 THz, and 8.47 THz, with corresponding absorptivity of 99.62%, 100%, and 88.12%. The simulation results were validated through impedance matching theory, and the formation mechanisms of the three absorption peaks were analyzed by examining electric field intensity, surface current and structural parameters. By modulating the Fermi level of graphene, dual control over absorptivity and resonant frequency can be achieved. Adjusting the relaxation time enables modulation of the absorptivity. Most importantly, the sensor not only demonstrates high absorption efficiency but also achieves a sensitivity of up to 2.717 THz/RIU. Furthermore, it shows potential in detecting basal cell carcinoma (BCC), as evidenced by the significant frequency shift observed between the absorption spectra of normal skin and BCC. The maximum sensitivity for detecting red blood cell infected with malaria reached 3.846 THz/RIU. Consequently, it is believed that the proposed sensor has great application potential in biosensing.</div></div>","PeriodicalId":100923,"journal":{"name":"Micro and Nanostructures","volume":"208 ","pages":"Article 208371"},"PeriodicalIF":3.0000,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Micro and Nanostructures","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2773012325003000","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, CONDENSED MATTER","Score":null,"Total":0}
引用次数: 0
Abstract
Terahertz metamaterial sensors hold significant promise in various fields, including biomedicine, agricultural production, non-destructive testing, and national defense security. This study introduces a metamaterial biomedical sensor based on patterned graphene absorber. The absorption spectrum obtained through simulation calculation in the CST microwave studio shows three distinct absorption peaks at 4.40 THz, 5.92 THz, and 8.47 THz, with corresponding absorptivity of 99.62%, 100%, and 88.12%. The simulation results were validated through impedance matching theory, and the formation mechanisms of the three absorption peaks were analyzed by examining electric field intensity, surface current and structural parameters. By modulating the Fermi level of graphene, dual control over absorptivity and resonant frequency can be achieved. Adjusting the relaxation time enables modulation of the absorptivity. Most importantly, the sensor not only demonstrates high absorption efficiency but also achieves a sensitivity of up to 2.717 THz/RIU. Furthermore, it shows potential in detecting basal cell carcinoma (BCC), as evidenced by the significant frequency shift observed between the absorption spectra of normal skin and BCC. The maximum sensitivity for detecting red blood cell infected with malaria reached 3.846 THz/RIU. Consequently, it is believed that the proposed sensor has great application potential in biosensing.