Abstract： A squarylium dye is dissolved in 4-cyano-4’-pentylbiphenyl (5CB) and oriented by sandwiching mixtures between two pieces of rubbed glass plates. The optical absorption spectra of the oriented squarylium dye-5CB layers exhibit high anisotropy. The third-order nonlinear optical responses and susceptibilities X3e of squarylium dye in 5CB are measured with light polarizations parallel and perpendicular to the orientational direction by the resonant femtosecond degenerate four-wave mixing (DFWM) technique. Temporal profiles of the DFWM signal of the oriented squarylium dye-5CB layers with light polarizations parallel and perpendicular to the orientational direction are measured with a time resolution of 0.3ps (FWHM), and are found to consist of two components, i.e., the coherent instantaneous nonlinear response and slow response due to the formation of excited molecules. A high anisotropic ratio of X3e, 10.8±1.2, is observed for the oriented layers.
JIN Zhao-Hui;LI Zhong-Yu;KASATANI Kazuo;OKAMOTO Hiroaki. Anisotropy in Third-Order Nonlinear Optical Susceptibility of a Squarylium Dye in a Nematic Liquid Crystal[J]. 中国物理快报, 2006, 23(3): 635-638.
JIN Zhao-Hui, LI Zhong-Yu, KASATANI Kazuo, OKAMOTO Hiroaki. Anisotropy in Third-Order Nonlinear Optical Susceptibility of a Squarylium Dye in a Nematic Liquid Crystal. Chin. Phys. Lett., 2006, 23(3): 635-638.
2006, Vol. 23 
