Journal
NANO LETTERS
Volume 12, Issue 4, Pages 1885-1890Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl204277y
Keywords
Plasmon coupling; subnanometer gap; gap resonance; dark mode; near field; sphere-on-plane
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Funding
- Deutsche Forschungsgemeinschaft [SPP 1391, SFB 625]
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Strongly coupled plasmons in a system of individual gold nanoparticles placed at subnanometer distance to a gold film (nanoparticle-on-plane, NPOP) are investigated using two complementary single particle spectroscopy techniques. Optical scattering spectroscopy exclusively detects plasmon modes that couple to the far field via their dipole moment (bright modes). By using photoemission electron microscopy (PEEM), we detect in the identical NPOPs near-field modes that do not couple to the scattered far field (dark modes) and are characterized by a strongly enhanced nonlinearelectron emission process. To our knowledge, this is the first time that both far- and near-field spectroscopy are carried out for identical individual nanostructures interacting via a subnanometer gap. Strongly resonant electron emission occurs at excitation wavelengths far off-resonant in the scattering spectra.
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