Open AccessEngineering surface lattice resonance of elliptical gold nanodisk array for enhanced strain sensing
Author(s) -
Kai Ming Chang,
Jiunn Shouh Cheng,
Tsan-Wen Lu,
Po Tsung Lee
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.033215
Subject(s) - laser linewidth , optics , materials science , wavelength , resonance (particle physics) , lattice (music) , optoelectronics , physics , laser , atomic physics , acoustics
We demonstrate an elliptical gold nanodisk array (GNA) for engineering the spectral profile of surface lattice resonance (SLR). The nanodisk's shape has a great impact on SLR. Small linewidth of 20 nm at an aspect ratio of 1.17, as well as large wavelength tuning of 64 nm within 4% strain via different orientations and polarizations, are achieved experimentally. The enhanced wavelength response of 6.93 nm per 1% strain variation for elliptical GNA is 2.4 times better than that for general circular GNA. Furthermore, the strain sensing for elliptical GNA approaches is 5.7 times greater than that for circular GNA.