Plasmonic resonance-linewidth shrinkage to boost biosensing  

作　　者：Min Gao Weimin Yang Zhengying Wang Shaowei Lin Jinfeng Zhu Zhilin Yang 

机构地区：[1]Department of Physics,Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices,Jiujiang Research Institute,Xiamen University,Xiamen 361005,China [2]Institute of Electromagnetics and Acoustics,Xiamen University,Xiamen 361005,China [3]College of Physics Science and Technology,Xinjiang University,Urumqi 830046,China [4]The First Affiliated Hospital of Xiamen University,Xiamen 361003,China

出　　处：《Photonics Research》2020年第7期1226-1235,共10页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(21673192,91850119);NSAF Joint Fund(U1830116);Ministry of Science and Technology of the People’s Republic of China(2016YFA0200601,2017YFA0204902);Natural Science Foundation of Jiangxi Province(20192ACB20032);Fundamental Research Funds for the Central Universities(20720190010)。

摘　　要：Coupling effects of surface plasmon resonance(SPR)induce changes in the wavelength,intensity,and linewidth of plasmonic modes.Here,inspired by coupling effects,we reveal an abrupt linewidth-shrinking effect in 2 D gold nanohole arrays at the azimuthal angle of 45°arising from the interference of two degenerate SPR modes.We further demonstrate the biosensing capability under various excitation conditions for detecting the critical molecular biomarker of prostatic carcinoma,and achieve the maximum sensitivity at this angle.Our study not only enhances the understanding toward plasmonic resonance-linewidth shrinking,but also provides a promising strategy to greatly improve biosensing performance by light manipulation on plasmonic nanostructures.

关 键 词：resonance PLASMON EXCITATION 

分 类 号：O53[理学—等离子体物理] TP212[理学—物理]