Illumination Dependent Optical Properties of Plasmonic Nanorods Coupled to Thin-Film Cavities
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The scattering spectra and intensity of gold nanorods placed at varied distances above gold films have been simulated and measured under various conditions, demonstrating that scattering characteristics of the nanorod-film system are highly dependent on illumination conditions. Studying the surrounding electric fields of nanorods reveals that the illumination-dependent properties of the system are induced by the interference in the nanorod-film system. Both simulations and experiments show that optimising the nanorod-film distance can greatly enhance scattering magnitudes up to ~20 times for certain illumination conditions. We propose an application of the studied system in facilitating photo-thermal conversion.
KeywordsGold nanorod Thin-film Fabry-Perot cavity Illumination-dependence photo-thermal effect
This work was financially supported by New Zealand’s Marsden Fund through contract UOO-1214, the Priming Partnership Pilot Funding (University of Otago), the National Natural Science Foundation of China (grants 61275030, 61205030, and 61235007), the Open Fund of State Key Laboratory of Advanced Optical Communication Systems and Networks, and the Swedish Foundation for Strategic Research (SSF) and the Swedish Research Council (VR).
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