Mirror enhanced directional out-coupling of SERS by remote excitation of a nanowire-nanoparticle cavity
| Autor: | Sunny Tiwari, Adarsh B. Vasista, Diptabrata Paul, G. V. Pavan Kumar |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Condensed Matter - Mesoscale and Nanoscale Physics Scattering Plane (geometry) business.industry Nanowire FOS: Physical sciences Position and momentum space Applied Physics (physics.app-ph) Physics - Applied Physics Condensed Matter - Soft Condensed Matter Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials symbols.namesake Optics Mesoscale and Nanoscale Physics (cond-mat.mes-hall) symbols Soft Condensed Matter (cond-mat.soft) business Raman scattering Plasmon Excitation Optics (physics.optics) Ground plane Physics - Optics |
| Popis: | We report on the experimental observation of mirror enhanced directional surface enhanced Raman scattering (SERS) from a self-assembled monolayer of molecules coupled to a nanowire-nanoparticle (NW-NP) junction on a mirror in remote excitation configuration. Placing NW-NP junction on a metallic mirror generates multiple gap plasmon modes which have unique momentum space scattering signatures. We perform Fourier plane imaging of SERS from NW-NP on a mirror to understand the effect of multiple hotspots on molecular emission. We systematically study the effect of ground plane on the directionality of emission from NW-NP junction and show that the presence of a mirror drastically reduces angular spread of emission. The effect of multiple hotspots in the geometry on directionality of molecular emission is studied using 3D numerical simulations. The results presented here will have implications in understanding plasmon hybridization in the momentum space and its effects on molecular emission. 19 pages, 10 figures |
| Databáze: | OpenAIRE |
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