Structure Effect of Squarylium Cyanine Dyes on Third-Order Optical Nonlinearities in Ground and Excited States
LIU Xu-chun1, XU Gang1, SI Jin-hai1, YE Pei-xian1, LIN Tong2, PENG Bi-xian2
1Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080
2Institute of Photographic Chemistry, Chinese Academy of Sciences, Beijing 100101
Structure Effect of Squarylium Cyanine Dyes on Third-Order Optical Nonlinearities in Ground and Excited States
LIU Xu-chun1;XU Gang1;SI Jin-hai1;YE Pei-xian1;LIN Tong2;PENG Bi-xian2
1Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080
2Institute of Photographic Chemistry, Chinese Academy of Sciences, Beijing 100101
Abstract： A series of squarylium cyanine dyes with different substituents were synthesized and the third-order optical nonlinearities of their ground and excited states were investigated by backward degenerate four-wave-mixing. For the ground state, the molecular hyperpolarizability γg increases with the red-shift of the absorption peak λabmax, of the squaraine with different substituents, whereas for the excited-state molecular hyperpolarizability γe, the nonlinear enhancement γe/γg decreases, which may indicate that in the excited state the electron accepting-donating ability of different substituents changes in the reverse order compared with the order in the ground state.
LIU Xu-chun;XU Gang;SI Jin-hai;YE Pei-xian;LIN Tong;PENG Bi-xian. Structure Effect of Squarylium Cyanine Dyes on Third-Order Optical Nonlinearities in Ground and Excited States[J]. 中国物理快报, 1999, 16(8): 571-573.
LIU Xu-chun, XU Gang, SI Jin-hai, YE Pei-xian, LIN Tong, PENG Bi-xian. Structure Effect of Squarylium Cyanine Dyes on Third-Order Optical Nonlinearities in Ground and Excited States. Chin. Phys. Lett., 1999, 16(8): 571-573.
1999, Vol. 16 
