Directional scattering and hydrogen sensing by bimetallic Pd-Au nanoantennas.

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.

[1]  Mikael Käll,et al.  A bimetallic nanoantenna for directional colour routing , 2011, Nature communications.

[2]  Harald Giessen,et al.  Palladium-based plasmonic perfect absorber in the visible wavelength range and its application to hydrogen sensing. , 2011, Nano letters.

[3]  T. Shegai,et al.  Hydride Formation in Single Palladium and Magnesium Nanoparticles Studied By Nanoplasmonic Dark-Field Scattering Spectroscopy , 2011, Advanced materials.

[4]  Tao Xu,et al.  Networks of ultrasmall Pd/Cr nanowires as high performance hydrogen sensors. , 2011, ACS nano.

[5]  Harald Giessen,et al.  Nanoantenna-enhanced gas sensing in a single tailored nanofocus , 2011, CLEO: 2011 - Laser Science to Photonic Applications.

[6]  P. Nordlander,et al.  Plasmons in strongly coupled metallic nanostructures. , 2011, Chemical reviews.

[7]  S. Maier,et al.  Plasmonic nanoantennas: fundamentals and their use in controlling the radiative properties of nanoemitters. , 2011, Chemical reviews.

[8]  Mikael Käll,et al.  Plasmon-enhanced colorimetric ELISA with single molecule sensitivity. , 2011, Nano letters.

[9]  Mikael Käll,et al.  Angular distribution of surface-enhanced Raman scattering from individual au nanoparticle aggregates. , 2011, ACS nano.

[10]  Peter Nordlander,et al.  Unidirectional broadband light emission from supported plasmonic nanowires. , 2011, Nano letters.

[11]  P. Johansson Electromagnetic Green's function for layered systems: Applications to nanohole interactions in thin metal films , 2010, 1012.0792.

[12]  B. Kasemo,et al.  Localized Surface Plasmons Shed Light on Nanoscale Metal Hydrides , 2010, Advanced materials.

[13]  M. Willatzen,et al.  Detuned electrical dipoles for plasmonic sensing. , 2010, Nano letters.

[14]  Igor Zorić,et al.  Nanoplasmonic Probes of Catalytic Reactions , 2009, Science.

[15]  Mikael Käll,et al.  Refractometric sensing using propagating versus localized surface plasmons: a direct comparison. , 2009, Nano letters.

[16]  Jeffrey N. Anker,et al.  Biosensing with plasmonic nanosensors. , 2008, Nature materials.

[17]  H. Fredriksson,et al.  Hole–Mask Colloidal Lithography , 2007 .

[18]  C. Broedersz,et al.  Hydrogenography: An Optical Combinatorial Method To Find New Light‐Weight Hydrogen‐Storage Materials , 2007 .

[19]  Igor Zorić,et al.  Hydrogen storage in Pd nanodisks characterized with a novel nanoplasmonic sensing scheme. , 2007, Nano letters.

[20]  W. Barnes,et al.  Long-Range Refractive Index Sensing Using Plasmonic Nanostructures , 2007 .

[21]  B. Kasemo,et al.  Absorption and scattering of light by Pt, Pd, Ag, and Au nanodisks: absolute cross sections and branching ratios. , 2007, The Journal of chemical physics.

[22]  W. Vargas,et al.  Optical and electrical properties of hydrided palladium thin films studied by an inversion approach from transmittance measurements , 2006 .

[23]  Lukas Novotny,et al.  Single-molecule orientations determined by direct emission pattern imaging , 2004 .

[24]  Hongxing Xu,et al.  Modeling the optical response of nanoparticle-based surface plasmon resonance sensors , 2002 .

[25]  A. Züttel,et al.  Hydrogen-storage materials for mobile applications , 2001, Nature.

[26]  F. Favier,et al.  Hydrogen Sensors and Switches from Electrodeposited Palladium Mesowire Arrays , 2001, Science.

[27]  Günter Gauglitz,et al.  Surface plasmon resonance sensors: review , 1999 .

[28]  E. Palik Handbook of Optical Constants of Solids , 1997 .

[29]  Olivier J. F. Martin,et al.  Iterative scheme for computing exactly the total field propagating in dielectric structures of arbitrary shape , 1994 .

[30]  J. Tann,et al.  A hydrogen sensor based on the optical generation of surface plasmons in a palladium alloy , 1994 .

[31]  W. Lukosz,et al.  Light emission by magnetic and electric dipoles close to a plane interface. I. Total radiated power , 1977 .

[32]  W. Lukosz,et al.  Light emission by magnetic and electric dipoles close to a plane dielectric interface. II. Radiation patterns of perpendicular oriented dipoles , 1977 .

[33]  R. W. Christy,et al.  Optical Constants of the Noble Metals , 1972 .