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Title: Nonlocal dielectric effects in core-shell nanowires.

Abstract

We study the optical spectra and near fields of core-shell nanowires (nanoshells), using a recently developed finite-difference method that allows for a spatially nonlocal dielectric response. We first analyze the parameters of the nonlocal model by making comparisons with related experimental data and previous theoretical work. We then investigate how nonlocal effects are dependent on nanoshell features, such as shell thickness, overall size, and the ratio of core radius to shell radius. We demonstrate that the shell thickness along the longitudinal direction of the incident light is the primary controlling factor of nonlocal effects, which appear as anomalous absorption resonances and blueshifts in the localized surface plasmon resonance (LSPR) positions, relative to local theory. In addition, we show that the amount of blueshift depends on the order of the LSPR. The optical responses of nanoshells immersed in various refractive index (RI) environments are also studied. We show that the nonlocal anomalous absorption features are relatively insensitive to RI changes, but the blueshift of the dipolar LSPR varies nonlinearly.

Authors:
; ;  [1]
  1. Center for Nanoscale Materials
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1039498
Report Number(s):
ANL/CNM/JA-66195
Journal ID: ISSN 1932-7447; TRN: US201209%%445
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry C
Additional Journal Information:
Journal Volume: 114; Journal Issue: 38; Journal ID: ISSN 1932-7447
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; ABSORPTION; DIELECTRIC MATERIALS; PLASMONS; REFRACTIVE INDEX; RESONANCE; SPECTRA; THICKNESS

Citation Formats

McMahon, J M, Gray, S K, Schatz, G C, CSE), and Northwestern Univ.). Nonlocal dielectric effects in core-shell nanowires.. United States: N. p., 2010. Web. doi:10.1021/jp910899b.
McMahon, J M, Gray, S K, Schatz, G C, CSE), & Northwestern Univ.). Nonlocal dielectric effects in core-shell nanowires.. United States. https://doi.org/10.1021/jp910899b
McMahon, J M, Gray, S K, Schatz, G C, CSE), and Northwestern Univ.). 2010. "Nonlocal dielectric effects in core-shell nanowires.". United States. https://doi.org/10.1021/jp910899b.
@article{osti_1039498,
title = {Nonlocal dielectric effects in core-shell nanowires.},
author = {McMahon, J M and Gray, S K and Schatz, G C and CSE) and Northwestern Univ.)},
abstractNote = {We study the optical spectra and near fields of core-shell nanowires (nanoshells), using a recently developed finite-difference method that allows for a spatially nonlocal dielectric response. We first analyze the parameters of the nonlocal model by making comparisons with related experimental data and previous theoretical work. We then investigate how nonlocal effects are dependent on nanoshell features, such as shell thickness, overall size, and the ratio of core radius to shell radius. We demonstrate that the shell thickness along the longitudinal direction of the incident light is the primary controlling factor of nonlocal effects, which appear as anomalous absorption resonances and blueshifts in the localized surface plasmon resonance (LSPR) positions, relative to local theory. In addition, we show that the amount of blueshift depends on the order of the LSPR. The optical responses of nanoshells immersed in various refractive index (RI) environments are also studied. We show that the nonlocal anomalous absorption features are relatively insensitive to RI changes, but the blueshift of the dipolar LSPR varies nonlinearly.},
doi = {10.1021/jp910899b},
url = {https://www.osti.gov/biblio/1039498}, journal = {Journal of Physical Chemistry C},
issn = {1932-7447},
number = 38,
volume = 114,
place = {United States},
year = {2010},
month = {1}
}