In-situ observation of thermochromic behavior in merocyanine J-aggregate monolayers using the multipurpose nonlinear optical microscope

Noritaka Kato, K. Saito, Y. Uesu

Research output: Contribution to journalArticle

1 Citation (Scopus)


We found the reversible thermochromic transition between different J-aggregate states of merocyanine dye (MD) monolayer on the subphase, which contains two kinds of counter-ions; Cd2+ and Mg2+. This transition is induced by the mutual recombination of Mg2+ and Cd2+ to MD molecules, and the absorption band of the aggregate (J-band) at 620 nm in low temperature phase changes drastically to 595 nm in high temperature phase. From the in-situ observation using the multipurpose nonlinear optical microscope, it was revealed that this phenomenon can be exploited for controlling not only the J-band but also the size and the optical second harmonic activity of J-aggregate domain.

Original languageEnglish
Pages (from-to)171-176
Number of pages6
JournalMolecular Crystals and Liquid Crystals Science and Technology Section B: Nonlinear Optics
Issue number1-4
Publication statusPublished - 1 Dec 2000


  • J-aggregate
  • Merocyanine dye
  • Monolayer at the air-water interface
  • Multipurpose nonlinear optical microscope
  • Thermochromism

Cite this