Thiacarbocyanine dye J-aggregation in optical trapping potential

Yoshito Tanaka*, Hiroyuki Yoshikawa, Hiroshi Masuhara

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations


Kinetics of J-aggregation of thiacarbocyanine (THIATS) has been investigated by measuring time variation of fluorescence spectrum under the solvent evaporation process of THIATS solution. Fluorescence spectrum of the THIATS J-aggregates changes following the increase of concentration, reflecting the formation and ripening process of J-aggregates. These THIATS J-aggregates are trapped and gathered at the focal point by focusing near-infrared (NIR) laser beam into the solution. Two-photon excited fluorescence from the focal spot is concurrently detected with the same trapping laser beam. Fluorescence spectral change is accelerated by focusing NIR laser beam. This result could be attributed that J-aggregates with higher polarizability are preferably formed in the focal spot of NIR laser. Furthermore, we have succeeded in the deposition of J-aggregates on a glass substrate by optical trapping.

Original languageEnglish
Title of host publicationOptical Trapping and Optical Micromanipulation III
StatePublished - 1 Dec 2006
EventOptical Trapping and Optical Micromanipulation III - San Diego, CA, United States
Duration: 13 Aug 200617 Aug 2006

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceOptical Trapping and Optical Micromanipulation III
CountryUnited States
CitySan Diego, CA


  • 3,3′-bis-[3-sulfopropyl]- 5,5′-dichloro-9-ethyl thiacarbocyanine
  • Confocal fluorescence image
  • Evaporation process
  • J-aggregates
  • Optical trapping
  • Photon pressure
  • Self-assembly
  • Supramolecular structures
  • Two-photon excitation fluorescence

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