Journal
NANO LETTERS
Volume 12, Issue 5, Pages 2464-2469Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl300558h
Keywords
Nanoantenna; plasmonic sensing; hydrogen sensing; directional emission; material asymmetry; palladium nanoparticles
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Funding
- Swedish Foundation for Strategic Research [RMA08]
- Swedish Research Council
- Goran Gustafsson Foundation
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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.
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