Research
Research
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Single-photon emitting source
Sinlgle-photon generation by quantum dots
Nano-spectroscopic study on single-photon characteristics of single perovskite nanocrystals is underway.
Microscopic observation of dynamical mesostructures in atomic monolayers
Optically triggered mesostructures in monolayer WS2
Microscopic study has revealed that optical excitation can create dynamics of structures and electrical nature of carriers (n-, p-type) in atomically thin monolayer of WS2. The observed photostrictive behavior is attributed to lattice expansion due to the formation of polarons, which are charge carriers dressed by lattice vibrations. The strong opto-electrical-mechanical coupling in the WS2 monolayer reveals previously unexplored properties, which can lead to new applications in optically driven ultrathin microactuators.
Hyperspectral microscopic characterization of materials and photonic devices
Construction of hyperspectral imaging microscopes (HIM)
Development of point scanning type (spatial scan) and full-field scanning type (spectral scan) hyperspectral systems combined with imaging microscopes.
Hyperspectral microscopic characterization of materials
Study of microscopic characteristics of nanostructured materials and photonic devices using hyperspectral imaging microscopes. Recently, our study for the green-gap problem of LED materials has been published (right image).
Ultrasensitive hyperspectral biosensing platforms
Hyperspectral imaging type plasmonic biosensing
Dark-field spectral imaging microscope for LSPR biosensing technique enables us to monitor the scattering spectra of individual Au nanorods, and to detect ~pM OTA, a mycotoxin related to carcinogenic illness (left upper image).
Ultrasensitive and stable plasmonic SERS substrates covered with 2-dimensional monolayers
SERS substrates of Ag nanoparticles (NPs) covered with graphene and hexagonal boron nitride remain stable over 80 days, and sandwich structures of Au NPs/2D layer/Ag NPs show detection limit as low as ~pM for R6G molecules (enhancement factor ~108, left lower image).
Fabrication of array type plasmonic nanostructures
Point-of-care testing (POCT) diagnostic instruments for foods and agriculture
POCT biosensing instruments for toxic molecules detection in foods
POCT spectrometer for plant diagnosis
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