期刊
NANOTECHNOLOGY
卷 24, 期 3, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/24/3/035201
关键词
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资金
- EPSRC [EP/H028757/1]
- Trinity College, Cambridge
- EPSRC [EP/H028757/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H028757/1] Funding Source: researchfish
In this paper, we study the local-field enhancement in a system of a metallic nanoparticle placed very near to a dielectric substrate. In such systems, intense electric fields are localized in the gap between the particle and the substrate, creating a 'hot-spot' under appropriate excitation conditions. We use finite-element numerical simulations in order to study the field enhancement in this dielectric-metal system. More specifically, we show how the optical properties of the dielectric substrate (n and k) affect the plasmonic field enhancement in the nano-gap. We also analyze the degree of field confinement in the gap and discuss it in the context of utilization for surface-enhanced Raman scattering. We finally show the fields generated by real substrates and compare them to metallic ones. S Online supplementary data available from stacks. iop.org/Nano/24/035201/mmedia
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