Directional Scattering and Hydrogen Sensing by Bimetallic Pd-Au Nanoantennas
Artikel i vetenskaplig tidskrift, 2012
Nanoplasmonic sensing is typically based on quantification of changes in optical extinction or scattering spectra. Here we explore the possibility of facile self-referenced hydrogen sensing based on angle-resolved spectroscopy. We found that heterodimers built from closely spaced gold and palladium nanodisks exhibit pronounced directional scattering, that is, for particular wavelengths, much more light is scattered toward the Au than toward the Pd particle in a dimer. The effect is due to optical phase shifts associated with the material asymmetry and therefore highly sensitive to changes in the permittivity of Pd induced by hydrogen loading. In a wider perspective, the results suggest that directional scattering from bimetallic antennas, and material asymmetry in general, may offer many new routes toward novel nanophotonic sensing schemes.
directional emission
palladium
surface-plasmons
storage materials
Nanoantenna
material asymmetry
nanostructures
scheme
hydrogen sensing
light-emission
plasmon resonance sensors
range
plasmonic sensing
interface
dipoles
Författare
Timur Shegai
Chalmers, Teknisk fysik, Bionanofotonik
Peter Johansson
Chalmers, Teknisk fysik, Bionanofotonik
Christoph Langhammer
Chalmers, Teknisk fysik, Kemisk fysik
Mikael Käll
Chalmers, Teknisk fysik, Bionanofotonik
Nano Letters
1530-6984 (ISSN) 1530-6992 (eISSN)
Vol. 12 5 2464-2469Styrkeområden
Nanovetenskap och nanoteknik
Materialvetenskap
Ämneskategorier
Annan teknik
Infrastruktur
Nanotekniklaboratoriet
DOI
10.1021/nl300558h