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Proceedings Paper

Optical nonlinearities of (TBA)2Ni(dmit)2: saturable-absorption and negative third-order nonlinear refraction due to charge-transfer transition
Author(s): Chuan-Lang Zhan; Wei Xu; Deqing Zhang; Dehuan Li; Zhen-Zhong Lu; Yu-Xin Nie; Daoben Zhu
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Paper Abstract

The optical nonlinearity of (TBA)2Ni(dmit)2 (TBA = tert-n-butanyl-amonimium, dmit = 1,3-dithiol-2-thione-4,5-dithiolate) at high incident irradiance was investigated using Z-scan technique with 1064 nm picosecond laser pulses. This molecule shows a strong absorption band ranging from 900 to 1600 nm. Under excitation by 1064nm laser pulses, this molecule exhibits typical saturable-absorption (SA) due to this transition, and shows a negative third-order contribution to nonlinear refraction (NLR). This result indicates that it shows a third-order self-defocusing. In addition, a positive fifth-order contribution to NLR, and the influences of aggregation and high excited-state absorption on nonlinear absorption were also observed in this molecule.

Paper Details

Date Published: 19 October 2001
PDF: 7 pages
Proc. SPIE 4580, Optoelectronics, Materials, and Devices for Communications, (19 October 2001); doi: 10.1117/12.444981
Show Author Affiliations
Chuan-Lang Zhan, Institute of Chemistry (China)
Wei Xu, Institute of Chemistry (China)
Deqing Zhang, Institute of Chemistry (China)
Dehuan Li, Institute of Physics (China)
Zhen-Zhong Lu, Institute of Physics (China)
Yu-Xin Nie, Institute of Physics (China)
Daoben Zhu, Institute of Chemistry (China)

Published in SPIE Proceedings Vol. 4580:
Optoelectronics, Materials, and Devices for Communications
Tien Pei Lee; Qiming Wang, Editor(s)

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