Film-coupled nanoparticles by atomic layer deposition: Comparison with organic spacing layers

Cristian Ciracì, Xiaoshu Chen, Jack J. Mock, Felicia McGuire, Xiaojun Liu, Sang Hyun Oh, David R. Smith

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

Film-coupled nanoparticle systems have proven a reliable platform for exploring the field enhancement associated with sub-nanometer sized gaps between plasmonic nanostructures. In this Letter, we present a side-by-side comparison of the spectral properties of film-coupled plasmon-resonant, gold nanoparticles, with dielectric spacer layers fabricated either using atomic layer deposition or using organic layers (polyelectrolytes or self-assembled monolayers of molecules). In either case, large area, uniform spacer layers with sub-nanometer thicknesses can be accurately deposited, allowing extreme coupling regimes to be probed. The observed spectral shifts of the nanoparticles as a function of spacer layer thickness are similar for the organic and inorganic films and are consistent with numerical calculations taking into account the nonlocal response of the metal.

Original languageEnglish (US)
Article number023109
JournalApplied Physics Letters
Volume104
Issue number2
DOIs
StatePublished - Jan 13 2014

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