Open AccessAnisotropic surroundings effects on photo absorption of partially embedded Au nanospheroids in silica glass substrate
Author(s) -
Xuan Meng,
Tamaki Shibayama,
Ruixuan Yu,
Junya Ishioka,
Seiichi Watanabe
Publication year - 2015
Publication title -
aip advances
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 58
ISSN - 2158-3226
DOI - 10.1063/1.4908010
Subject(s) - materials science , substrate (aquarium) , dielectric , anisotropy , absorption (acoustics) , amorphous solid , irradiation , scattering , nanoparticle , molecular physics , composite material , optics , optoelectronics , nanotechnology , crystallography , chemistry , oceanography , physics , nuclear physics , geology
The influence of a directly adjacent or an anisotropic surrounding medium alters the plasmonic properties of a nanoparticle because it provides a mechanism for symmetry breaking of the scattering. Given the success of ion irradiation induced embedment of rigid metallic nanospheroids into amorphous substrate, it is possible to examine the effect of the silica glass substrate on the plasmonic properties of these embedded nanospheroids. In this work presented here, discrete dipole approximation (DDA) calculations for the Au nanospheroids' optical properties were performed based on 3-dimensional (3D) configuration extracted from planar SEM micrographs and cross-sectional TEM micrographs of the Au nanospheroids partially embedded in the silica glass, and the well-matched simulations with respect to the experimental measurements could demonstrate the dielectric constant at the near surface of silica glass decreased after Ar-ion irradiation
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