期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 122, 期 25, 页码 13259-13266出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.7b08428
关键词
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资金
- Robert A. Welch Foundation [C-1664, C-1222]
- Army Research Office [MURI W911NF-12-1-0407]
- National Science Foundation [CHE1507745, 1450681]
- European Research Council (ERC) [267867 Plasmaquo]
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 degrees, producing clearly resolved, nondegenerate, and orthogonally polarized plasmon modes.
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