Terahertz spoof surface plasmon sensing based on dielectric metagrating coupling

文献类型： 外文期刊

第一作者： Li, Xiangjun

作者： Li, Xiangjun;Wang, Luoyang;Cheng, Gang;Hou, Xiaomei;Yan, Dexian;Qiu, Guohua;Li, Xiangjun;Yan, Dexian;Yan, Dexian;Guo, Shihui;Zhou, Weidong;Li, Jining

作者机构：

期刊名称：APL MATERIALS （ 影响因子：5.096； 五年影响因子：4.841 ）

ISSN： 2166-532X

年卷期： 2021 年 9 卷 5 期

页码：

收录情况： SCI

摘要： We propose a terahertz surface plasmon resonance sensor based on dielectric metagrating coupling to the spoof surface plasmon (SSP) mode on periodically grooved metal films. The well-designed silicon metagrating converts the normal incident to the necessary angle in the dielectric substrate exciting SSP with the transmission coupling between couplers and SSP metasurfaces. Using an all-dielectric metagrating as an external coupler, the tightly confined SSP mode can be excited within a small resonant cavity, causing the strong light-matter interaction. The proposed SSP dielectric meta-couplers will pave new routes for ultra-thin and compact sensing devices. The dielectric substrate thickness, the air gap distance between the substrate and the metal groove array, and metal groove gaps have remarkable influences on the characteristics of SSP sensing. The SSP sensing by metagrating coupling with the resonance frequency around 0.404 THz provides a high sensitivity of up to 335 GHz/RIU and a detection limit less than 0.0001 RIU with a frequency resolution of 33.5 MHz. Dielectric metagrating coupling SSP provides enormous potential for constructing ultra-sensitive and compact SSP sensors in the terahertz frequency region.

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