Directional Scattering and Hydrogen Sensing by Bimetallic Pd-Au Nanoantennas
Journal article, 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

Author

Timur Shegai

Chalmers, Applied Physics, Bionanophotonics

Peter Johansson

Chalmers, Applied Physics, Bionanophotonics

Christoph Langhammer

Chalmers, Applied Physics, Chemical Physics

Mikael Käll

Chalmers, Applied Physics, Bionanophotonics

Nano Letters

1530-6984 (ISSN) 1530-6992 (eISSN)

Vol. 12 5 2464-2469

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Materials Science

Subject Categories

Other Engineering and Technologies

Infrastructure

Nanofabrication Laboratory

DOI

10.1021/nl300558h

More information

Created

10/8/2017