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Photoinduced changes in a Sudan I doped PMMA thin film

Published online by Cambridge University Press:  06 December 2008

T. He ,
C. Wang ,
X. Pan  and
Y. Wang
T. He
Affiliation:
Department of physics, Shanghai Jiao Tong University, Shanghai 200240, P.R. China
C. Wang*
Affiliation:
Department of physics, Shanghai Jiao Tong University, Shanghai 200240, P.R. China
X. Pan
Affiliation:
Department of physics, Shanghai Jiao Tong University, Shanghai 200240, P.R. China
Y. Wang
Affiliation:
Department of physics, Shanghai Jiao Tong University, Shanghai 200240, P.R. China
*
cswang@sjtu.edu.cn
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Abstract

Photoinduced changes in a Sudan I doped PMMA thin film were investigated. The dependence of photoinduced birefringence of the thin film on light intensity was studied, with a continuous wave (CW) 532 nm laser as pump light and a CW 650 nm laser as probe light. For all the light intensities (100–1000 mW/cm2), the thin film possessed large photoinduced birefringence (Δn ~ 10−4). With a CW 532 nm laser at relatively low light intensity, a reversible polarization hologram has been recorded in the thin film. Moreover, Z-scan measurements showed that the thin film possessed large nonlinear refractive index (−7.93 × 10−5  cm 2/W) and nonlinear absorption coefficient (−5.50 W/cm) under a CW 532 nm excitation.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 44 , Issue 3 , December 2008 , pp. 277 - 281
Copyright
© EDP Sciences, 2008

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