Title :
Nearly Perfect Absorption by Bimetallic Surface Plasmonic Crystal and Its Application as Sensor
Author_Institution :
Dept. of Phys., Ajou Univ., Suwon, South Korea
Abstract :
The author proposes and numerically investigates nearly perfect absorption in a bimetallic surface plasmonic crystal formed by two physically adjoined gold and silver nanohole array layers. The absorption over 99% at 650-nm wavelength is obtained and its high quality factor is preserved for oblique incidence. The structure is examined as a plasmonic sensor to measure the refractive indexes. The author achieves a very high modified figure-of-merit of 335.
Keywords :
gold; infrared spectra; nanophotonics; nanosensors; nanostructured materials; numerical analysis; optical sensors; plasmonics; refractive index measurement; silver; visible spectra; Au-Ag; bimetallic surface plasmonic crystal; gold nanohole array layers; nearly perfect absorption; oblique incidence; plasmonic sensor; quality factor; refractive index measurement; silver nanohole array layers; wavelength 650 nm; Absorption; Arrays; Gold; Optical sensors; Optical surface waves; Plasmons; Absorbing media; nanophotonics; optical sensors;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2014.2320907
