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.
|Number of pages||6|
|Journal||Molecular Crystals and Liquid Crystals Science and Technology Section B: Nonlinear Optics|
|Publication status||Published - 1 Dec 2000|
- Merocyanine dye
- Monolayer at the air-water interface
- Multipurpose nonlinear optical microscope