Analysis of Transmission Characteristics and Multiple Resonances in Plasmonic Gratings Coated with Homogeneous Dielectrics
We analyze the broadband transverse magnetic transmission characteristics of two very low aspect ratio plasmonic nanograting structures under normal incidence,using rigorous coupled wave analysis and full wave Maxwells equations solver.A binary metallic grating with narrow fundamental surface plasmon resonance mode was obtained by systematic variation of geometrical parameters.The binary grating had an aspect ratio of 0.2 and exhibited a sensitivity of 560nm/RIU.Our analysis of another structure consisting of a metallic grating with a very small aspect ratio of 0.1,patterned on a thin homogeneous metal interspacer layer on a dielectric substrate shows ~50% reduction in full width at half maximum of fundamental surface plasmon resonance with a sensitivity of 590nm/RIU.This plasmonic nanograting structure exhibits a strong potential to be used as refractive index sensor due to very high sensitivity,higher localization of the fields,possibly higher signal to noise ratio and very low aspect ratios that are needed to maintain laminar flow of analyte.
P.Arora A.Krishnan
Department of Electrical Engineering,Indian Institute of Technology Madras,Chennai,India
国际会议
Progress in Electromagnetics Research Symposium 2013(2013年电磁学研究新进展学术研讨会)
台北
英文
927-931
2013-03-01（万方平台首次上网日期，不代表论文的发表时间）