Tunable Multiple-Step Plasmonic Bragg Reflectors with Graphene-Based Modulated Grating

Sensors

Yue Liang¹  Menglai Zhang¹  Qinglu Qian¹  Jicheng Wang¹  Youjian Liang¹  Ting Xiao¹  Hongyan Shao¹ 

[1] School of Science, Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Jiangnan University, Wuxi 214122, China;

关键词: plasmonics;    Bragg grating sensor;    metal-insulator-metal;    finite element method;   

DOI  :  10.3390/s16122039

来源: DOAJ

【 摘 要 】

We propose a novel plasmonic Bragg reflector (PBR) based on graphene with multiple-step silicon structure. The monolayer graphene bears locally variable optical properties by modulation of electric fields, and the periodical change of effective refractive index on graphene can be obtained by external bias voltage in the mid-infrared region. Through patterning the PBR units into multiple-step structures, we can decrease the insertion loss and suppress the rippling in transmission spectra. By introducing the defect into the multiple-step PBRs, the multiple resonance modes are formed inside the stopband by increasing the step number. This work may pave the ways for the further development of ultra-compact low-cost hyperspectral sensors in the mid-infrared region.

【 授权许可】

Unknown