Time-resolved microspectroscopy and interferometry of organic mesoscopic materials

Hiroshi Masuhara, Keiji Sasaki, Hiroshi Fukumura, Hiroshi Furutani

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)531-536
Number of pages6
Issue number4
Publication statusPublished - 1998 Apr


  • Ablation
  • Expansion-contraction
  • Fluorescence microscopy
  • Laser trapping
  • Lasing dynamics
  • Mesoscopic materials
  • Microparticle
  • Nanosecond time-resolved interferometry
  • Thin film

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy
  • Electrochemistry


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