19 February 2014 Substrate-induced effects on the plasmonic properties of strongly coupled silver nanocubes
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Abstract
The behaviour of the plasmonic modes of supported strongly coupled silver nanocubes is studied. Silver nanocube monolayers with controlled particle density were fabricated via the Langmuir-Blodgett technique and deposited on substrates with varying refractive indices. Substrates include glass, thin films of silicon, and titanium oxide on glass. The dipolar and bonded dipolar modes are red shifted with increasing refractive index of the substrate. Surface-enhanced Raman spectroscopy (SERS) is used as a tool to probe the electric field enhancements of the silver nanocube monolayers. SERS enhancement of silver nanocube monolayers is found to be highly substrate dependant, typically decreasing with increasing refractive index of the underlying substrate. This work aims to find the source of this enhancement decrease, and distinguishes between effects related electromagnetic enhancement and effects caused by the optics of the Raman spectroscopy system itself.
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Daniel Prezgot, Anatoli Ianoul, "Substrate-induced effects on the plasmonic properties of strongly coupled silver nanocubes", Proc. SPIE 8996, Quantum Dots and Nanostructures: Synthesis, Characterization, and Modeling XI, 899612 (19 February 2014); doi: 10.1117/12.2040466; https://doi.org/10.1117/12.2040466
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