TY - JOUR
T1 - Environmental symmetry breaking promotes plasmon mode splitting in gold nanotriangles
AU - Smith, Kyle W.
AU - Yang, Jian
AU - Hernandez, Taylor
AU - Swearer, Dayne F.
AU - Scarabelli, Leonardo
AU - Zhang, Hui
AU - Zhao, Hangqi
AU - Moringo, Nicholas A.
AU - Chang, Wei Shun
AU - Liz-Marzán, Luis M.
AU - Ringe, Emilie
AU - Nordlander, Peter
AU - Link, Stephan
N1 - Publisher Copyright:
© XXXX American Chemical Society.
PY - 2017
Y1 - 2017
N2 - We report a single particle investigation of the polarized scattering spectra of individual Au nanotriangles (NTs) of the truncated bifrustrum type. We unexpectedly observed a wide diversity in the scattering spectra from a population of NTs with low shape polydispersity. Correlation of the optical measurements with electron microscopy revealed that the different optical responses were not due to distinct NT shapes. Rather, finite element simulations revealed that distinct polarized spectra originated from minute changes in the inclination of the NTs on the substrate. NT inclination resulted in asymmetric image charge formation in the substrate, thus, breaking the degeneracy of the modes supported by the NTs. The degeneracy of the NT modes was extremely sensitive to such symmetry breaking, with inclination angles as small as 2°, producing clearly resolved, nondegenerate, and orthogonally polarized plasmon modes.
AB - We report a single particle investigation of the polarized scattering spectra of individual Au nanotriangles (NTs) of the truncated bifrustrum type. We unexpectedly observed a wide diversity in the scattering spectra from a population of NTs with low shape polydispersity. Correlation of the optical measurements with electron microscopy revealed that the different optical responses were not due to distinct NT shapes. Rather, finite element simulations revealed that distinct polarized spectra originated from minute changes in the inclination of the NTs on the substrate. NT inclination resulted in asymmetric image charge formation in the substrate, thus, breaking the degeneracy of the modes supported by the NTs. The degeneracy of the NT modes was extremely sensitive to such symmetry breaking, with inclination angles as small as 2°, producing clearly resolved, nondegenerate, and orthogonally polarized plasmon modes.
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U2 - 10.1021/acs.jpcc.7b08428
DO - 10.1021/acs.jpcc.7b08428
M3 - Article
AN - SCOPUS:85032624602
SN - 1932-7447
VL - 121
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 39
ER -