Laser-induced self-assembly of rseudoisocyanine J-aggregates

Yoshito Tanaka, Hiroyuki Yoshikawa*, Hiroshi Masuhara

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


This letter describes that the appearance and growth of J-aggregate are clearly accelerated by focusing a near-infrared laser beam into an aqueous solution of psudoisocyanine while gradually increasing the concentration by solvent evaporation. The J-aggregate formed in the laser focus shows a narrower fluorescence bandwidth compared to those obtained by simple concentration increase. This indicates that the growth of the highly ordered J-aggregates is preferentially enhanced in the laser focus, which is the first demonstration showing laser-induced self-assembly of psudoisocyanine J-aggregates. Furthermore, we discuss the mechanism of the laser-induced self-assembly on the basis of thermodynamic equilibrium between the in and out of optical trapping potential produced by the focused laser beam.

Original languageEnglish
Pages (from-to)18457-18460
Number of pages4
JournalJournal of Physical Chemistry C
Issue number50
StatePublished - 20 Dec 2007

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