Near-Field Plasmonics of an Individual Dielectric Nanoparticle above a Metallic Substrate

Tanya Hutter, Fu Min Huang, Stephen R. Elliott, Sumeet Mahajan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)


We simulate and discuss the local electric-field enhancement in a system of a dielectric nanoparticle placed very near to a metallic substrate. We use finite-element numerical simulations in order to understand the field-enhancement mechanism in this dielectric NP-on-mirror system. Under appropriate excitation conditions, the gap between the particle and the substrate becomes a "hot spot", i.e., a region of intense electromagnetic field. We also show how the optical properties of the dielectric NP placed on a metallic substrate affect the plasmonic field enhancement in the nanogap and characterize the confinement in the gap. Our study helps to understand and design systems with dielectric NPs on metallic substrates which can be equally as effective for SERS, fluorescence, and nonlinear phenomena as conventional all plasmonic structures.

Original languageEnglish
Pages (from-to)7784-7790
JournalThe Journal of Physical Chemistry C
Issue number15
Early online date27 Mar 2013
Publication statusPublished - 18 Apr 2013




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