Surface-plasmonic sensor using a columnar thin film in the grating-coupled configuration [Invited]  

作　　者：Kiran Mujeeb Muhammad Faryad Akhlesh Lakhtakia Julio V.Urbina 

机构地区：[1]Department of Electronics,Quaid-i-Azam University,Islamabad 45320,Pakistan [2]Department of Physics,Lahore University of Management Sciences,Lahore 54792,Pakistan [3]Department of Engineering Science and Mechanics,The Pennsylvania State University,University Park,Pennsylvania 16802,USA [4]Department of Electrical Engineering,The Pennsylvania State University,University Park,Pennsylvania 16802,USA

出　　处：《Chinese Optics Letters》2021年第8期121-129,共9页中国光学快报（英文版）

基　　金：partial support from HEC,Pakistan,via grant 2016-5905;the Charles Godfrey Binder Endowment at Penn State for ongoing support of his research activities。

摘　　要：The excitation of a surface-plasmon-polariton(SPP) wave guided by a columnar thin film(CTF) deposited on a one-dimensional metallic surface-relief grating was investigated for sensing the refractive index of a fluid infiltrating that CTF. The Bruggemann homogenization formalism was used to determine the relative permittivity scalars of the CTF infiltrated by the fluid. The change in the refractive index of the fluid was sensed by determining the change in the incidence angle for which an SPP wave was excited on illumination by a p-polarized plane wave, when the plane of incidence was taken to coincide with the grating plane but not with the morphologically significant plane of the CTF. Multiple excitations of the same SPP wave were found to be possible, depending on the refractive index of the fluid, which can help increase the reliability of results by sensing the same fluid with more than one excitation of the SPP wave.

关 键 词：metal grating multiple excitation rigorous coupled-wave approach sensitivity surface-plasmon-polariton wave 

分 类 号：O539[理学—等离子体物理] TP212[理学—物理]