Valentina Robbiano, Marina Giordano, Christian Martella, Francesco Di Stasio, Daniele Chiappe, Francesco Buatier de Mongeot and Davide Comoretto Hybrid Plasmonic–Photonic Nanostructures: Gold Nanocrescents Over Opals Advanced Optical Materials 1
The interaction of localized surface plasmon resonances (LSPRs) with the photonic modes in an opal photonic crystal is investigated. Gold nanocrescents are evaporated at glancing angles both over microsphere monolayers and artificial opals. By changing the microsphere diameter, the opal photonic stop band and a selected plasmonic resonance can be spectrally overlapped, causing a dramatic change of the properties of both excitations. The creation of new optical modes is observed, whose spectral position and dispersion properties are a combination of those localised in crescent plasmons and in the opal.
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