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Dark plasmonic breathing modes in silver nanodisks.

ABSTRACT: We map the complete plasmonic spectrum of silver nanodisks by electron energy loss spectroscopy and show that the mode which couples strongest to the electron beam has radial symmetry with no net dipole moment. Therefore, this mode does not couple to light and has escaped from observation in optical experiments. This radial breathing mode has the character of an extended two-dimensional surface plasmon with a wavenumber determined by the circular disk confinement. Its strong near fields can impact the hybridization in coupled plasmonic nanoparticles as well as couplings with nearby quantum emitters.

SUBMITTER: Schmidt FP

PROVIDER: S-EPMC3558010 | biostudies-literature | 2012 Nov

REPOSITORIES: biostudies-literature

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Dark plasmonic breathing modes in silver nanodisks.

Schmidt Franz-Philipp FP Ditlbacher Harald H Hohenester Ulrich U Hohenau Andreas A Hofer Ferdinand F Krenn Joachim R JR

Nano letters 20121003 11

We map the complete plasmonic spectrum of silver nanodisks by electron energy loss spectroscopy and show that the mode which couples strongest to the electron beam has radial symmetry with no net dipole moment. Therefore, this mode does not couple to light and has escaped from observation in optical experiments. This radial breathing mode has the character of an extended two-dimensional surface plasmon with a wavenumber determined by the circular disk confinement. Its strong near fields can impa ...[more]

PMID: 23025804

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