Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 85: Plasmonics and nanooptics V
O 85.10: Talk
Friday, March 30, 2012, 12:45–13:00, MA 005
Spectral Shifts in Optical Nanoantenna-Enhanced Hydrogen Sensors — •Andreas Tittl1, Christian Kremers2, Jens Dorfmüller1, Dmitry Chigrin2, and Harald Giessen1 — 14th Physics Institute and Research Center SCoPE, University of Stuttgart — 2Institute of High-Frequency and Communication Technology, Faculty of Electrical, Information and Media Engineering, University of Wuppertal
We present numerical investigations on the nature of spectral shifts in antenna-enhanced hydrogen sensing geometries consisting of a single gold bowtie antenna situated next to a palladium nanodisk.
We performed extensive numerical FEM calculations and will show how previously published experimental results for this system[1] can be modeled and understood by considering two competing effects: a small spectral blueshift of the resonance caused by the change of the dielectric function from Pd to PdH and a substantial redshift caused by the expansion of the Pd lattice and in turn of the Pd nanodisk.
The insight we gain into the spectral behavior of this system enables us to accurately model antenna-enhanced hydrogen sensors. Furthermore, it allows a numerical characterization and optimization of such structures beyond half bowtie geometries and thus paves the way towards the realization of extremely sensitive plasmonic hydrogen sensors.
[1] Liu et al., Nat. Mater. 10, 631-636 (2011)