Spectral shifts in optical nanoantenna-enhanced hydrogen sensors

Publikationstyp
Journal Article
Date Issued
2012-02-01
Sprache
English
Author(s)
Tittl, Andreas  
Kremers, Christian
Dorfmüller, Jens
Chigrin, Dmitry N.
Giessen, Harald
TORE-URI
https://hdl.handle.net/11420/61996
Journal
Optical materials express  
Volume
2
Issue
2
Start Page
111
End Page
118
Citation
Optical Materials Express 2 (2): 111-118 (2012)
Publisher DOI
10.1364/OME.2.000111
Scopus ID
2-s2.0-84862151160
In this work, we numerically investigate the nature of spectral shifts in antenna-enhanced hydrogen sensing geometries consisting of a gold bowtie antenna next to a palladium nanodisk. We find through extensive finite element (FEM) simulations that the hydrogen-induced spectral behavior of the system is governed by two competing effects: a small blueshift caused by dielectric function changes in the palladium and a much stronger redshift due to an expansion of the palladium lattice. Our findings enable the accurate numerical characterization and especially the optimization of sensitive antenna-enhanced hydrogen sensors. As a first application, we calculate the performance improvement of gap antennas compared to single cut-wire antenna elements. © 2012 Optical Society of America.
DDC Class
600: Technology