Nanosecond photo-fusion of microcrystals on a polymer film observed with time-resolved ultramicroscopy

Ken Ichi Saitow*, Hiromi Banjo, Nobuyuki Ichinose, Shunichi Kawanishi, Hiroshi Masuhara, Hiroshi Fukumura

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


A time-resolved ultramicroscope was developed to monitor the process of pulse-laser-induced melting of 9,10-dicyanoanthracene microcrystals on poly(ethyl methacrylate) films. The microscope can detect sub-micrometer particles, but with an image (spacial) resolution of 2μm and a time resolution of 400ps. Quantitative comparison between images obtained at a certain time delay after an excitation laser pulse and a pre-irradiated image is achieved using a correlation function. It was found that crystals having a size of about 10μm turn in hot liquid droplets within the nanosecond excitation pulse after which 80% of the droplets solidify with a time constant of 9ns. The residual 20% of hot liquid droplets appear to have either evaporated or fused and dispersed into the polymer with a time constant of 15ns.

Original languageEnglish
Pages (from-to)159-164
Number of pages6
JournalJournal of Photochemistry and Photobiology A: Chemistry
Issue number3
StatePublished - 3 Dec 2001


  • Laser-induced melting
  • Nanosecond photo-fusion
  • Time-resolved ultramicroscope

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