Journal
OPTICS EXPRESS
Volume 21, Issue 22, Pages 27509-27518Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.027509
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Funding
- Centre for Doctoral Training on Theory and Simulation of Materials (TSM-CDT)
- EPSRC Active Plasmonics Programme
- ESF Plasmon-Bionanosense Network
- Leverhulme Trust
- Gordon and Betty Moore Foundation
- EPSRC [EP/D063329/1, EP/H000917/2] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H000917/2, EP/D063329/1] Funding Source: researchfish
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The nanofocusing performance of hourglass plasmonic waveguides is studied analytically and numerically. Nonlocal effects in the linearly tapered metal-air-metal stack that makes up the device are taken into account within a hydrodynamical approach. Using this hourglass waveguide as a model structure, we show that spatial dispersion drastically modifies the propagation of surface plasmons in metal voids, such as those generated between touching particles. Specifically, we investigate how nonlocal corrections limit the enormous field enhancements predicted by local electromagnetic treatments of geometric singularities. Finally, our results also indicate the emergence of nonlocality assisted tunnelling of plasmonic modes across hourglass contacts as thick as 0.5 nm. (C) 2013 Optical Society of America
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