Biography
Biography: Masayoshi Tonouchi
Abstract
Recent progress on terahertz (THz) science and technology attracts much attention to scientists in broad area but also to the general public for new applications . THz waves covers around from 300GHz to 30THz in frequency, which corresponds to 10ïm to 1mm in wavelength. The values are vastly larger than nanoscales. Nevertheless, we’ve been proposing to create new scientific field as terahertz nanoscience. This is because the links between THz science and nanoscience are so strong. Examples are THz quantum cascade lasers (QCLs), ultrafast carrier dynamics in solids, hydration dynamics in biomolecules and medicines, and so on. THz QCLs are strong THz source and made of multiple layers of quantum wells viz. nanostructure. Various kinds of carrier scattering times in solid state for electronics application distributes from several ten femtoseconds to a few picoseconds whereas 1THz corresponds to 1ps. Hydration time to some molecules are also in similar time scales. Typical energy for intermolecular interaction of large molecules lies in the range of meV, which also corresponds to THz region. In the present work, we give an overview of THz nanoscience and recent progress of our own research such as laser THz emission microscope.
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