Journal
ACS NANO
Volume 11, Issue 1, Pages 850-855Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b07350
Keywords
nano-optics; nanoparticles; tunable plasmons; plasmonic cavities; plasmonic polarization signature
Categories
Funding
- EPSRC [EP/L027151/ERC]
- grant LINASS [320503]
- Winton Programme for the Physics of Sustainability
- CI Taylor Fund
- C2 project [C24/15/015]
- KU Leuven [PDMK/14/126]
- FWO [V405115N]
- Flemish government
- St John's College, University of Cambridge
- EPSRC [EP/G060649/1, EP/K028510/1, EP/L027151/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/L027151/1, 1352498, EP/G060649/1, EP/K028510/1] Funding Source: researchfish
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Polarized optical dark-field spectroscopy is shown to be a versatile noninvasive probe of plasmonic structures that trap light to the nanoscale. Clear spectral polarization splittings are found to be directly related to the asymmetric morphology of nanocavities formed between faceted gold nanoparticles and an underlying gold substrate. Both experiment and simulation show the influence of geometry on the coupled system, with spectral shifts Delta lambda = 3 nm from single atoms. Analytical models allow us to identify the split resonances as transverse cavity modes, tightly confined to the nanogap. The direct correlation of resonance splitting with atomistic morphology allows mapping of subnanometre structures, which is crucial for progress in extreme nano-optics involving chemistry, nanophotonics, and quantum devices.
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