{"title":"Dynamic Tunable Bidirectional Excitation Multi-PIT Device for Terahertz Biosensing and Optical Switching","authors":"Xiaowan Guo, Jingyu Cong, Chaoyang Li","doi":"10.1007/s11468-023-02036-z","DOIUrl":null,"url":null,"abstract":"<div><p>In this study, a multi-layered and bi-directionally excitable plasmon-induced transparency (PIT) device with multiple graphene layers was designed. The PIT window was regulated by controlling the Fermi level of graphene, resulting in an increase in the resonance frequency and dip depth of the PIT transmission valleys with an increase in the Fermi level. Theoretical investigations were then conducted. Subsequently, the influence of interlayer distance, individual component size, and relative positioning of graphene on the performance of PIT was studied. When employed as a biosensor, it could only be utilized under x-polarized TM waves, exhibiting a maximum sensitivity of 8.2THz/RIU. As an optical switch, it exhibited the highest modulation depth of 89.7% at 9.04THz under x-polarized waves, and a maximum modulation depth of 94.6% at 2.8THz under y-polarized waves. This theoretically designed PIT device can have potential applications in both sensors and optical switches.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"19 2","pages":"803 - 815"},"PeriodicalIF":3.3000,"publicationDate":"2023-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Plasmonics","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1007/s11468-023-02036-z","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
In this study, a multi-layered and bi-directionally excitable plasmon-induced transparency (PIT) device with multiple graphene layers was designed. The PIT window was regulated by controlling the Fermi level of graphene, resulting in an increase in the resonance frequency and dip depth of the PIT transmission valleys with an increase in the Fermi level. Theoretical investigations were then conducted. Subsequently, the influence of interlayer distance, individual component size, and relative positioning of graphene on the performance of PIT was studied. When employed as a biosensor, it could only be utilized under x-polarized TM waves, exhibiting a maximum sensitivity of 8.2THz/RIU. As an optical switch, it exhibited the highest modulation depth of 89.7% at 9.04THz under x-polarized waves, and a maximum modulation depth of 94.6% at 2.8THz under y-polarized waves. This theoretically designed PIT device can have potential applications in both sensors and optical switches.
期刊介绍：
Plasmonics is an international forum for the publication of peer-reviewed leading-edge original articles that both advance and report our knowledge base and practice of the interactions of free-metal electrons, Plasmons.
Topics covered include notable advances in the theory, Physics, and applications of surface plasmons in metals, to the rapidly emerging areas of nanotechnology, biophotonics, sensing, biochemistry and medicine. Topics, including the theory, synthesis and optical properties of noble metal nanostructures, patterned surfaces or materials, continuous or grated surfaces, devices, or wires for their multifarious applications are particularly welcome. Typical applications might include but are not limited to, surface enhanced spectroscopic properties, such as Raman scattering or fluorescence, as well developments in techniques such as surface plasmon resonance and near-field scanning optical microscopy.
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