光学学报, 2019, 39 (7): 0728011, 网络出版: 2019-07-16   

可调谐交叉领结形石墨烯阵列结构等离子体折射率传感器 下载: 1104次

Plasma Refractive Index Sensor with Tunable Cross Tie-Shaped Graphene Array Structure
作者单位
1 桂林电子科技大学广西精密导航技术与应用重点实验室, 广西 桂林 541004
2 桂林电子科技大学电子工程与自动化学院, 广西 桂林 541004
摘要
设计一种新颖的交叉领结形石墨烯阵列结构等离子体折射率传感器。利用石墨烯与电介质交界面产生的表面等离子体效应,在中红外波段获得双共振透射现象,结合石墨烯的电可调特性来实现透射谱的动态调制,采用时域有限差分法研究该结构中石墨烯的化学势、层数及几何参数对双共振透射现象的影响。结果表明:通过改变石墨烯的化学势及层数能够实现共振位置的调谐;优化结构参数后,该结构具有较好的传感性能和双共振透射现象,2个共振谷的灵敏度分别高达(1280±24) nm/RIU和(2800±49) nm/RIU,品质因数分别为17.1 RIU -1和12.3 RIU -1。研究结果为石墨烯等离子体生物传感器的设计提供了理论依据。
Abstract
In this study, we design a plasma refractive index sensor with a cross tie-shaped graphene array structure. Further, the double-resonance transmission phenomenon in the mid-infrared band can be obtained by using the surface plasmon effect produced by the interface between the graphene and dielectric, and the dynamic regulation of the transmission spectrum can be realized by combining the electrically adjustable characteristics of graphenes. Subsequently, the effects of the chemical potential, number of layers, and geometric parameters of graphenes on the double-resonance transmission phenomenon in the structure are studied using the finite-difference time-domain method. The results denote that the resonance position can be tuned by changing the chemical potential and the number of layers of the graphene. Compared with a traditional sensor, this structure exhibits better sensing performance and double-resonance transmission phenomenon after the structural parameter optimization. The sensitivities of two resonance valleys are as high as (1280±24) and (2800±49) nm/RIU with quality factors of 17.1 and 12.3 RIU -1, respectively. These results provide a theoretical basis for the graphene plasma biosensor design.

肖功利, 杨秀华, 杨宏艳, 窦婉滢, 徐俊林, 韦清臣, 李海鸥, 张法碧, 李琦, 陈永和, 傅涛, 孙堂友. 可调谐交叉领结形石墨烯阵列结构等离子体折射率传感器[J]. 光学学报, 2019, 39(7): 0728011. Gongli Xiao, Xiuhua Yang, Hongyan Yang, Wanying Dou, Junlin Xu, Qingchen Wei, Haiou Li, Fabi Zhang, Qi Li, Yonghe Chen, Tao Fu, Tangyou Sun. Plasma Refractive Index Sensor with Tunable Cross Tie-Shaped Graphene Array Structure[J]. Acta Optica Sinica, 2019, 39(7): 0728011.

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