Chin. Phys. Lett.  1999, Vol. 16 Issue (8): 571-573    DOI:
Original Articles |
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
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LIU Xu-chun, XU Gang, SI Jin-hai et al  1999 Chin. Phys. Lett. 16 571-573
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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 γeg 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.

Keywords: 42.65.-k      42.70.-h     
Published: 01 August 1999
PACS:  42.65.-k (Nonlinear optics)  
  42.70.-h  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y1999/V16/I8/0571
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LIU Xu-chun
XU Gang
SI Jin-hai
YE Pei-xian
LIN Tong
PENG Bi-xian
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