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Proceedings Paper

In situ SHG monitoring of dipolar orientation and relaxation in Disperse Red type/derivative urethane-urea copolymer
Author(s): A. Samoc; A. Holland; M. Tsuchimori; O. Watanabe; M. Samoc; B. Luther-Davies; V. Z. Kolev
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Paper Abstract

We investigated linear optical and second-order nonlinear optical (NLO) properties of films of urethane-urea copolymer (UU2) functionalised with a high concentration of an azobenzene chromophore. The polymer films on ITO-coated substrate were corona poled to induce a noncentrosymmetric organization of chromophore dipoles and data on the second harmonic generated with the laser beam (the fundamental wavelength 1053 nm, 6 ps/pulse, 20 Hz repetition rate) was acquired as a function of time and temperature. Second harmonic generation (SHG) was used to monitor in situ the polar alignment and relaxation of orientation of the side-chain Disperse Red-like chromophore molecules in the films poled at room temperature and high above the glass transition temperature (Tg 140-150oC). The deff coefficient was determined from the Maker-fringe method and corrected for absorption. A strong second harmonic effect with a fast relaxation was observed in "cold" (room temperature) poling experiments. A large second-order resonantly enhanced optical nonlinearity (d33 of the order of 200 pm/V) was obtained in high temperature poling. A strong and stable nonlinearity has persisted for years after the films were high-temperature poled.

Paper Details

Date Published: 5 October 2005
PDF: 11 pages
Proc. SPIE 5949, Nonlinear Optics Applications, 59490X (5 October 2005); doi: 10.1117/12.622712
Show Author Affiliations
A. Samoc, The Australian National Univ. (Australia)
A. Holland, RMIT Univ. (Australia)
M. Tsuchimori, Toyota Central Research and Development Labs. Inc. (Japan)
O. Watanabe, Toyota Central Research and Development Labs. Inc. (Japan)
M. Samoc, The Australian National Univ. (Australia)
B. Luther-Davies, The Australian National Univ. (Australia)
V. Z. Kolev, The Australian National Univ. (Australia)

Published in SPIE Proceedings Vol. 5949:
Nonlinear Optics Applications
Miroslaw A. Karpierz; Allan Dawson Boardman; George I. Stegeman, Editor(s)

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