Grating-assisted ultra-narrow multispectral plasmonic resonances for sensing application

• DOI: 10.7567/1882-0786/ab24af
• Publication Date: 2019-05-27T22:30:11Z
• Authors: Yuyin Li; Ye Liu; Zhengqi Liu; Qian Tang; Leilei Shi; Qiqi Chen; Guozhen Du; Biao Wu; Guiqiang Liu; Lei Li
• Keywords: Figure of Merit

We propose a high-quality multispectral plasmonic sensor by coating dielectric grating on the semiconductor-metal-semiconductor stacks. Ultra-narrow resonances with minimum bandwidth of 8 nm are insensitive to polarization incident light. The ultra-narrow multi-band phenomenon can be ascribed synergy guided mode resonances, cavity modes and surface plasmon polaritons. displays superior refractive index sensitivity (404.295 nm/RIU) figure merit (50.3) also used detect protein layer in sub-nanometer thickness. These offer new perspectives for achieving ultra-compact efficient sensors filters.