Journal
OPTICAL MATERIALS EXPRESS
Volume 2, Issue 2, Pages 111-118Publisher
OPTICAL SOC AMER
DOI: 10.1364/OME.2.000111
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Funding
- DFG [SPP1391, FOR557, FOR730]
- BMBF [WAS-SENS, 3D METAMAT, NANOGAS]
- Baden-Wurttemberg Stiftung (Kompetenznetz Funktionelle Nanostrukturen)
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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. (C) 2012 Optical Society of America
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