Light-tunable Fano resonance in metal-dielectric multilayer structures.
High-Q optical Fano resonances realized in a variety of plasmonic nanostructures and metamaterials are very much promising for the development of new potent photonic devices, such as optical sensors and switches. One of the key issues in the development is to establish ways to effectively modulate the Fano resonance by external perturbations. Dynamic tuning of the Fano resonance applying the mechanical stress and electric fields has already been demonstrated. Here, we demonstrate another way of tuning, i.e., photo-tuning of the Fano resonance. We use a simple metal-dielectric multilayer structure that exhibits a sharp Fano resonance originating from coupling between a surface plasmon polariton mode and a planar waveguide mode. Using a dielectric waveguide doped with azo dye molecules that undergo photoisomerization, we succeeded in shifting the Fano resonance thorough photo-modulation of the propagation constant of the waveguide mode. The present work demonstrates the feasibility of photo-tuning of the Fano resonance and opens a new avenue towards potential applications of the Fano resonance.
Optics and Photonics Center, Moroccan Foundation for Advanced Science, Innovation and Research (MAScIR), Rabat 10100, Morocco.|Graduate School of Engineering, Kobe University, Kobe 657-8501, Japan.
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Hayashi
Optics and Photonics Center, Moroccan Foundation for Advanced Science, Innovation and Research (MAScIR), Rabat 10100, Morocco.
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Nesterenko
Optics and Photonics Center, Moroccan Foundation for Advanced Science, Innovation and Research (MAScIR), Rabat 10100, Morocco.
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Rahmouni
Graduate School of Frontier Biosciences, Osaka University, Suita 565-0871, Japan.
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Ishitobi
Graduate School of Frontier Biosciences, Osaka University, Suita 565-0871, Japan.
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Inouye
Graduate School of Engineering, Osaka University, Suita 565-0871, Japan.
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Kawata
Optics and Photonics Center, Moroccan Foundation for Advanced Science, Innovation and Research (MAScIR), Rabat 10100, Morocco.|Graduate School of Engineering, Osaka University, Suita 565-0871, Japan.|Faculty of Sciences, University Mohamed V, Rabat 10010, Morocco.
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