We have been studying the spectral properties of strong coupling states between metallic nanostructures and excitons. We have reported on the modulation and dynamics of the near-field spectral properties of exciton-plasmon strong coupling systems. However, it has been difficult to quantitatively evaluate the phase relaxation times experimentally because the central wavelength of the exciton is far from the central wavelength of the Ti:sapphire laser. Therefore, in this study, we fabricated an exciton-plasmon strong coupling system using an exciton with a central wavelength near 800 nm and aimed to quantitatively clarify the relationship between the near-field spectral characteristics and the phase relaxation dynamics of the system. Peak splitting was observed both in the far-field and near-field spectra, indicating the successful formation of a strong coupling state. We are now trying to measure the phase relaxation dynamics of the strong coupling system.
Recently we have developed LSPR-mediated high resolution live-cell imaging techniques for adhesive cells on plasmonic metasurface composed of self-assembled gold or silver nanoparticles. Compared with other super-resolution microscopy techniques, our LSPR-mediated imaging is extremely simple but quite effective for monitoring the molecular dynamics at a nanointerface. The LSPR of the plasmonic metasurface provides high-contrast interfacial images due to the confined light within a region a few tens of nanometers from the particles and the enhancement of fluorescence. The improved lateral resolution reaches down to the theoretical limit even during cell movement due to the properties of the metasurface with an extremely high refractive index. In the presentation, we will present our latest imaging data concerning molecular dynamics in live cells, which were not visualized by other super-resolution imaging methods with low temporal resolution.
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