Nano-scale Thermophysical Properties Monitoring and Thermal System Design in Nano/Micro region

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The aim of this project is the development of novel optical techniques to measure thermophysical properties, and to study on a system design in nano/micro region. The results are summarized as follows ;"Development of high-resolution and high-sensitivity measurement systems of nano/micro-scale thermophysical properties"(1)A novel optical technique for measuring the nano-scale thermophysical properties (i.e. thermal conductivity and thermal diffusivity) using near-field optical thermoreflectance and near-field fluorescence, which has nano-scale spatial resolution beyond the optical diffraction limit, has been developed. The spatial resolution is estimated to be approximately 100 nm.(2)For the measurement of molecular diffusion phenomena in liquid, a high-sensitive and high-reproducible technique using laser-induced thermal grating has been proposed.(3)By adopting high-speed and high-sensitive measurement system, the real-time monitoring of thermal properties enabling the system-control in situ can be realized."Thermal system design of nano/micro devices"(1)The nano-scale temperature distribution of self-assembled monolayer of Cy3 fluorophore and quantum-dots were successfully measured using near-field fluorescence thermometry.(2)The molecular diffusion phenomena of fullerene in solution and multicomponent liquid for sophisticated polymer were observed by using laser-induced thermal grating. Moreover, the concentration dependence of diffusion coefficient was revealed.(3)The thermal properties of nano/micro devices such as nematic liquid crystal, Bi_2Te_3 thin films and single-walled carbon nanotubes, which strongly depended on the crystalline of nano-material, were successfully observed.