Structure Effect of Squarylium Cyanine Dyes on Third-Order Optical Nonlinearities in Ground and Excited States

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 γ_g increases with the red-shift of the absorption peak λ^ab_max, of the squaraine with different substituents, whereas for the excited-state molecular hyperpolarizability γ_e, the nonlinear enhancement γ_e/γ_g 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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