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Directional Scattering and Hydrogen Sensing by Bimetallic Pd-Au Nanoantennas

Timur Shegai (Institutionen för teknisk fysik, Bionanofotonik) ; Peter Johansson (Institutionen för teknisk fysik, Bionanofotonik) ; Christoph Langhammer (Institutionen för teknisk fysik, Kemisk fysik) ; Mikael Käll (Institutionen för teknisk fysik, Bionanofotonik)
Nano Letters (1530-6984). Vol. 12 (2012), 5, p. 2464-2469.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Nanoantenna, plasmonic sensing, hydrogen sensing, directional emission, material asymmetry, plasmon resonance sensors, storage materials, surface-plasmons, light-emission, palladium, dipoles, nanostructures, interface, scheme, range

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Denna post skapades 2012-06-12. Senast ändrad 2017-10-03.
CPL Pubid: 158848


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Institutioner (Chalmers)

Institutionen för teknisk fysik, Bionanofotonik (2007-2015)
Institutionen för teknisk fysik, Kemisk fysik (1900-2015)


Nanovetenskap och nanoteknik
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