Affiliation:
1. Universidade Federal de Pernambuco
2. Universidade do Estado do Amazonas
Abstract
In this work, the spectral dependence of optimum parameters of the
surface plasmon resonance (SPR) effect on metallized sinusoidal
diffraction gratings, under normal incidence, was determined using the
particle swarm optimization method. The method was chosen due to its
simplicity and effectiveness in providing reliable results, relative
to direct search or gradient methods. The Rayleigh’s hypothesis, which
restricts the analysis to the case of shallow gratings, is used to
model the diffracted fields across the interface between the sensing
medium and metal. A penalty function was applied to avoid the
occurrence of singularities and violation of the validity of the
Rayleigh hypothesis. Using this procedure, the optimum values of
grating periodicity and amplitude that maximized the sensitivity
function for gold, silver, copper, and aluminum—metals that yield high
quality factor SPR effects—were determined in a wavelength range
between 500 and 1600 nm, for both gaseous and aqueous
sensing media.
Funder
Coordenação de Aperfeiçoamento de Pessoal
de Nível Superior
Conselho Nacional de Desenvolvimento
Científico e Tecnológico
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering