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Chinese Physics Letters

Observation of Optical Bistabilities in a Doped Polymer Thin Film Quasi-waveguide

Wang Huitian, 董凤忠 Dong Fengzhong, Zhanxiang Zhang, Peixian Ye, Ling Qiu, Jifeng Shen, Xingfa Fu, Shen Yuquan

Published Apr 1, 1995• 4 citations
Publisher

Abstract

Optical bistability was observed and studied in the output of reflected beam as well as in that of m -lines in a doped polymer thin film quasi-waveguide. The physical origin was demonstrated to be the existence of a mode spectrum and the high third-order nonlinearity of the polymer film. It was also observed for the first time that the intensity variation of the reflected beam and the m -line in the hysteresis loops are complementary to each other.

DOI
10.1088/0256-307x/12/4/006

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Optical bistability was observed and studied in the output of reflected beam as well as in that of m -lines in a doped polymer thin film quasi-waveguide. The physical origin was demonstrated to be the existence of a mode spectrum and the high third-order nonlinearity of the polymer film. It was also observed for the first time that the intensity variation of the reflected beam and the m -line in the hysteresis loops are complementary to each other.
Optical bistability is the quantum optical realization of a first order phase transition far from equilibrium. A resonant nonlinear optical response of it-electron excitations in low dimensional structures provides the nonlinearity essential to the onset of bistability. Saturable absorption studies of glassy polymer films consisting of quasi two-dimensional conjugated disc-like structures of silicon naphthalocyanine demonstrate that on-resonance the system behaves as an optical Bloch system with an intensity dependent refractive index n2 of 1x10-4 cm2/kW in the wavelength range of standard laser diodes. Based on this result, electronic absorptive optical bistability is observed on a nanosecond time scale in a nonlinear Fabry-Perot interferometer employing the saturably absorbing naphthalocyanine film as the nonlinear optical medium.