The Fano resonance is a resonant phenomenon that exhibits an asymmetric line shape caused by an interaction between a broad resonant mode and a sharp resonant mode. Over the past decade, many studies on the Fano resonance have been performed, in particular, in nanostructures made of metal, semiconductor or dielectric materials, due to its physical interest and potential applications such as sensors, switches and platforms for enhancement spectroscopy [1, 2]. However, towards the real applications, the nanostructures have some issues such as the high cost for fabrication, difficulties of analytical calculation or design. As one of the replacements, we have focused on the Fano resonance in simple multilayer structures, and demonstrated quite narrow and high-g Fano resonances (Q ~ 2800) [3, 4]. Using the multilayer structure, it is easy to photo-functionalize the Fano resonance by merely doping photo-functional molecules into the layers.
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