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Optical–optical isomerization mechanism for the third-order optical nonlinearity in side-chain azobenzene copolymer

✍ Scribed by Bin Guo; Bing Gu; Peng Yin; Zhongze Gu

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
227 KB
Volume
405
Category
Article
ISSN
0921-4526

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✦ Synopsis

The third-order optical nonlinear properties of a side-chain azobenzene copolymer have been studied using the Z-scan technique at 532 nm with 35 ps pulses. The mechanism has been described in detail via an optical-optical isomerization. The two-photon absorption coefficient b was measured to be 234 cm/GW and the nonlinear refraction coefficient g was measured to be À 104 Â 10 À 4 cm 2 /GW at the on-axis peak intensities I 0 of 0.5623 GW/cm 2 . It is found that b and g decreased significantly with increasing I 0 , and the faster optical responses of b and g should prove valuable in optical signal processing devices.

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