Laser Manipulation and Ablation of a Single Microcapsule in Water

Hiroaki Misawa, Noboru Kitamura, Hiroshi Masuhara*

*Corresponding author for this work

Research output: Contribution to journalArticle

47 Scopus citations


Laser manipulation and ablation of a single microcapsule containing a pyrene/toluene solution were demonstrated for the first time. Irradiation of an individual capsule by a focused (~1 μm) laser beam from a CW Nd3+:YAG laser (1064 nm) enabled us three-dimensional optical manipulation of the capsule in water. When a laser-trapped microcapsule was further irradiated by a 355-nm laser pulse (pulse width ~7 ns), deformation or ablative decomposition of the capsule was observed depending on the pulsed-laser intensity. The pyrene/toluene droplet ejected from the capsule upon laser ablation was shown to be tweezered by the 1064-nm laser beam. Spectroscopic characterization of individual capsules and droplets was achieved by a laser trapping-spectroscopy technique. Ablation mechanism was also discussed in terms of the pyrene concentration dependence of the ablation threshold energy.

Original languageEnglish
Pages (from-to)7859-7863
Number of pages5
JournalJournal of the American Chemical Society
Issue number21
StatePublished - 1 Oct 1991

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