Dielectric nanostructures with high refractive index and low optical loss have attracted considerable attention as an alternative to plasmonic nanostructures. We experimentally demonstrated to control the visible electromagnetic resonances of Si-based core-shell nanostructures by thermally varying the core-shell ratio. We also found a Fano resonance which was generated by the interference between the electric and magnetic dipole moments excited in the core-shell nanostructures. The all-dielectric nanostructures realized low energy loss and high electromagnetic field enhancement comparable with that exhibited by plasmonic nanostructures. These unique optical properties would enable us to demonstrate effective field-enhanced spectroscopy and imaging with low heat generation.
Taka-aki Yano, Yuta Tsuchimoto, Tomohiro Hayashi, and Masahiko Hara, "All-dielectric nanostructures for low-loss field enhanced spectroscopy and imaging
(Conference Presentation)," Proc. SPIE 9925, Nanoimaging and Nanospectroscopy IV, 99250K (Presented at SPIE Nanoscience + Engineering: August 29, 2016; Published: 11 November 2016); https://doi.org/10.1117/12.2238904.5161498101001.
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