Event Date
Wednesday, 11 March 2026 3:00 pm ~ 4:00 pm
Speaker
Professor. Koichi Okamoto
（Department of Physics and Electronics, Osaka Metropolitan University, Osaka, Japan）
Title
“Metaphotonics for Next-Generation Optical Devices ~From Plasmonics and Metamaterials to Strong Light–Matter Interactions~”
Abstract
Metaphotonics is an emerging concept that extends nanophotonics by placing metamaterials at its core, aiming to design optical functionality through engineered subwavelength structures and their collective electromagnetic responses. This approach emphasizes systematic control of light–matter interactions beyond individual nanostructures.
In this seminar, I will present our recent studies on metaphotonic optical devices based on plasmonics and metamaterials. Plasmonic nanostructures supporting localized surface plasmon resonances enable strong electromagnetic field confinement, allowing control of spontaneous emission rates and wavelength-selective optical responses. By combining metallic nanostructures with dielectric spacer layers, we have demonstrated flexible resonance tuning over a wide spectral range, from the deep ultraviolet to the infrared.
Random plasmonic metamaterials, including nano-hemisphere-on-mirror (NHoM) structures, provide scalable platforms for full-color tuning and have been applied to emission enhancement, optical sensing, and imaging. Time-resolved optical measurements further reveal accelerated emission dynamics extending beyond the immediate near-field region, indicating plasmon-mediated radiative coupling and collective emission behavior.
Through these examples, this talk highlights metaphotonics as a unifying framework for plasmonics and metamaterials and discusses its relevance to next-generation optical devices through strong light–matter interactions.
Chair
Prof. Yukina Takahashi
(Advanced Energy Materials Thrust)
Language
English
