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Directional scattering and hydrogen sensing by bimetallic Pd-Au nanoantennas
Örebro University, School of Science and Technology.ORCID iD: 0000-0002-2110-3071
2012 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 12, no 5, p. 2464-2469Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2012. Vol. 12, no 5, p. 2464-2469
Keywords [en]
Nanoantenna, plasmonic sensing, hydrogen sensing, directional emission, material asymmetry, palladium nanoparticles
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:oru:diva-23059DOI: 10.1021/nl300558hISI: 000303696400051PubMedID: 22449167Scopus ID: 2-s2.0-84861017392OAI: oai:DiVA.org:oru-23059DiVA, id: diva2:529652
Available from: 2012-05-31 Created: 2012-05-31 Last updated: 2017-12-07Bibliographically approved

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Johansson, Peter

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