Advanced optical technologies utilizing unique characteristics of light will play an important role in a future information-oriented society. Our group aims to open new research fields in optical science and to progress toward the ultimate goal of new optical technologies. On the basis of new ideas and original concepts, we investigated optical communication, metrology, and control technologies manipulating the quantum and wave natures of light.

Analysis and control of photophysical processes within an optical nano-microcavities

nanocavities

Photon localization within microspherical cavities and random structures are investigated to realize cavity quantum electrodynamical effects and nonlinear optical phenomena for applications such as single-photon switching devices and highly efficient nano-microlasers

Analysis of emission dynamics of single nano-emitters

emitter

Towards the developement of opto-electronic devices such as solar cells or single-photon sources, the influence of the substrates on the emission dynamics of single quantum dots are investigated. Using single molecule spectroscopy technique and photon correlation measurements, we analyze the emission characteristics and trap state lifetime of single quantum dots

Direct imaging of localized surface plasmon fields

surface plasmon

We have developed a scattering-type near-field microscope combining an atomic force microscope with a confocal microscope for the direct imaging of localized plasmonic field induced in a metal nanostructure with high spatial resolution beyond the diffraction limit. Using this system, nonlinear phenomena induced in the structure are investigated aiming aat the realization of the strong interaction between light and matter in designed metal nanostructures.

Realization of novel multi-photon excited process using entangled surface plasmons

entangle

By realizing quantumly entangled localized gap plasmons by irradiating the entangled photons onto the metal nanogap structure, we are aiming to develop novel imaging and lithographical technologies with high spatial resolution far beyond the diffraction limit. For this purpose, we are conducting the research to realize the multi-photon reaction process in ultra-high efficiency using the entangled photons coupled with localized surface plasmons.

Angular momentum of photon and electron

entangle

We are studying spin and orbital angular momentum of photon, electron and their quasiparticles (surface plasmon polariton ...) to achieve a platform for novel light-matter interactions.

Nanoparticle trapping using localized surface and potential analysis

entangle

We are studying spin and orbital angular momentum of photon, electron and their quasiparticles (surface plasmon polariton ...) to achieve a platform for novel light-matter interactions.