Abstract
Conventional all-optical switches based on azo polymer films and theall-optical switches based on the attenuated total reflection (ATR)geometry are investigated. A conventional switch system, including apump beam of 532 nm and a probe beam of 650 nm, is based on the photoinducedbirefringence effect of azo polymer. An ATR switch in aprism-multilayer configuration is achieved by changing the reflectanceof the probe beam with an external pump beam. The ATR method providesthe substantial improvement of the speed and the efficiency of themodulation over the conventional method. Although the azo polymerresponse still remains relatively slow, an enhanced nonlinear refractiveindex of the azo polymer film can effectively increase themodulation.
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