Infrared Plasmonic Refractive Index Sensor with Ultra-High Figure of Merit Based on the Optimized All-Metal Grating

被引：156

作者：

Li, Ruifang ^{[1
]}

Wu, Dong ^{[1
]}

Liu, Yumin ^{[1
]}

Yu, Li ^{[1
,2
]}

Yu, Zhongyuan ^{[1
]}

Ye, Han ^{[1
]}

机构：

[1] Beijing Univ Posts & Telecommun, State Key Lab Informat Photon & Opt Commun, Beijing 100876, Peoples R China

[2] Beijing Univ Posts & Telecommun, Sch Sci, Beijing 100876, Peoples R China

来源：

NANOSCALE RESEARCH LETTERS | 2017年 / 12卷

基金：

中国国家自然科学基金;

关键词：

Metamaterials; Optical sensing and sensors; Surface plasmons; Absorption; NARROW-BAND ABSORBER; METAMATERIAL ABSORBER; POLARIZATION; RESONATORS; BIOSENSOR; FREQUENCY; DESIGN; RING;

D O I：

10.1186/s11671-016-1773-2

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A perfect ultra-narrow band infrared metamaterial absorber based on the all-metal-grating structure is proposed. The absorber presents a perfect absorption efficiency of over 98% with an ultra-narrow bandwidth of 0.66 nm at normal incidence. This high efficient absorption is contributed to the surface plasmon resonance. Moreover, the surface plasmon resonance-induced strong surface electric field enhancement is favorable for application in biosensing system. When operated as a plasmonic refractive index sensor, the ultra-narrow band absorber has a wavelength sensitivity 2400 nm/RIU and an ultra-high figure of merit 3640, which are much better than those of most reported similar plasmonic sensors. Besides, we also comprehensively investigate the influences of structural parameters on the sensing properties. Due to the simplicity of its geometry structure and its easiness to be fabricated, the proposed high figure of merit and sensitivity sensor indicates a competitive candidate for applications in sensing or detecting fields.

引用

页数：6

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