Abstract
The characterization of mesoscopic materials and analysis of their physical and chemical processes were performed by advanced laser and optical techniques. By using a laser manipulation technique, a micrometre-sized particle in solution was chosen and fixed at the focal point of a microscope by the photon pressure of a focused near-infrared laser beam. The laser trapping potential exerted on the single microparticle was thus analysed. A picosecond time-resolved fluorescence microspectroscopic system was applied to measure picosecond lasing dynamics of a single particle, and the results are discussed. The electric charge on a single microparticle in solution and the adhesion force between the particle and a quartz plate were also determined by the laser manipulation method. Mesoscopic thin films undergo morphological change and ablation on intense laser pulse excitation. The photothermal expansion–contraction and photodecomposition behaviour of a surface layer was interrogated by means of time-resolved interferometry developed by combining a nanosecond time-resolved laser and Michelson interferometry.
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