Absorption bleaching of squarylium dye J aggregates via a two-photon excitation process
Squarylium dye J aggregates exhibit ultrafast nonlinear optical response of absorption saturation at the resonant wavelength of 770 nm. We studied the two-photon excitation process of J aggregates. By fluorescence measurement, we found the two-photon absorption band at 1.3 {mu}m, which was different from that of the dye solution at 1.2 {mu}m. Absorption saturation at 770 nm via a two-photon excitation process was observed by two-photon resonant excitation at 1.3 {mu}m and also by off-resonant excitation at 1.55 {mu}m, suggesting the possibility of J aggregates for optical switching materials working at the wavelength used in optical communications. {copyright} 2001 American Institute of Physics.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40230678
- Journal Information:
- Applied Physics Letters, Vol. 79, Issue 6; Other Information: DOI: 10.1063/1.1390322; Othernumber: APPLAB000079000006000708000001; 041131APL; PBD: 6 Aug 2001; ISSN 0003-6951
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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