Plasmonic field enhancement of individual nanoparticles by correlated scanning and photoemission electron microscopy

We present results of a combined two-photon photoemission and scanning electron microscopy investigation to determine the electromagnetic enhancement factors of silver-coated spherical nanoparticles deposited on an atomically flat mica substrate. Femtosecond laser excitation of the nanoparticles pro...

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Bibliographic Details
Published in:The Journal of chemical physics 2011-01, Vol.134 (3), p.034507-034507-7
Main Authors: Peppernick, Samuel J., Joly, Alan G., Beck, Kenneth M., Hess, Wayne P.
Format: Article
Language:English
Subjects:
Aluminum Silicates - chemistry
DEFECTS
DISTRIBUTION
Electromagnetic Phenomena
ELECTRON MICROSCOPY
Environmental Molecular Sciences Laboratory
EXCITATION
LASERS
MICA
Microscopy, Electron
Nanoparticles - chemistry
PHOTOEMISSION
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PLASMONS
RADIATIONS
SCANNING ELECTRON MICROSCOPY
SILVER
Silver - chemistry
Surface Plasmon Resonance
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Summary:We present results of a combined two-photon photoemission and scanning electron microscopy investigation to determine the electromagnetic enhancement factors of silver-coated spherical nanoparticles deposited on an atomically flat mica substrate. Femtosecond laser excitation of the nanoparticles produces intense photoemission, attributed to near-resonant excitation of localized surface plasmons. Enhancement factors are determined by comparing the respective two-photon photoemission yields measured for single nanoparticles and the surrounding flat surface. For p-polarized, 400 nm (∼3.1 eV) femtosecond radiation, a distribution of enhancement factors is found with a large percentage (67%) of the nanoparticles falling within a median range. A correlated scanning electron microscopy analysis demonstrated that the nanoparticles typifying the median of the distribution are characterized by spherical shapes and relatively smooth silver film morphologies. In contrast, the largest enhancement factors were produced by a small percentage (7%) of particles that displayed silver coating defects that altered the overall particle structure. Comparisons are made between the experimentally measured enhancement factors and previously reported calculations of the localized near-field enhancement for isolated silver nanoparticles.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.3543714