https://scholars.lib.ntu.edu.tw/handle/123456789/598757
標題: | Electrically tunable plasmonic biosensors based on cavity-coupled structure with graphene | 作者: | CHIEN-HAO LIU | 關鍵字: | Effective sensitivity;graphene tunability;hybrid plasmonic biosensors;Biosensors;Energy gap;Graphene;Lithography;Natural frequencies;Photonic band gap;Refractive index;Cavity structure;Coupled structures;Effective refractive index;Electrically tunable;Photonic band-gap structures;Plasmonic biosensors;Research results;Resonant frequency shift;Plasmonics | 公開日期: | 2021 | 卷: | 27 | 期: | 4 | 來源出版物: | IEEE Journal of Selected Topics in Quantum Electronics | 摘要: | In this research, we proposed a highly tunable hybrid plasmonic biosensor for identifying molecule fingerprints of proteins in the infrared range. The device is composed of a photonic band-gap structure and a cavity. The plasmonic energy is confined inside the cavity to enhance the light-analyte interactions. A layer of graphene is placed on the bottom surface of the cavity that is filled with analytes for detection. Our device has a high value of effective sensitivity that is defined as the ratio of the resonant frequency shift to the change of effective refractive index when the cavity is loaded with an analyte. The effective refractive index takes into account the effects of both the cavity structure and the optical property of the analyte. Another feature of our device is that a wide-ranging electrical tunability can be realized by applying various values of bias voltage to the graphene. The resonant frequency can be tuned for sensing different analytes without redesigning and refabricating the device. In addition, the graphene tunability can improve the sensitivity in detecting the non-targeted analytes. A prototype was designed based on photonic theory and fabricated via bottom-up lithography techniques. The research results are expected to be beneficial for nanometer-range bio-identifications and infrared optical sensors. ? 1995-2012 IEEE. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85098772036&doi=10.1109%2fJSTQE.2020.3045676&partnerID=40&md5=e872603358c084d79f3a93670f8eb41c https://scholars.lib.ntu.edu.tw/handle/123456789/598757 |
ISSN: | 1077260X | DOI: | 10.1109/JSTQE.2020.3045676 |
顯示於: | 機械工程學系 |
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