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Photothermal mechanisms for absorptive bistability in polymeric films

The authors propose two possible mechanisms for the realization of photothermal bistability in polymeric solids due to a thermally induced increase of absorption. The first mechanism is based on thermostress induced shifting of the pod infrared bands upon laser heating. A qualitative model of such bistability has been considered. The second mechanism of bistability is based on dichroism of light absorption in highly oriented polymeric systems. A model has been developed in which increased absorption is ensured by thermo-induced structural transitions resulting in a decrease of the anisotropy.