The polarization of PVF and PVF2pyroelectrics

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Abstract
Through detailed investigations of the modulation frequency response of pyroelectric detectors, nonuniform polarizations have been shown to exist in polyvinylfluoride and polyvinylidene fluoride plastics. The nonuniform polarization is also confirmed by measurements using multilayer structures. The direction and magnitude of the gradients in polarization are dependent on the magnitude and polarity of the poling voltage. The gradients in the polarization for PVF and PVF2 are opposite in direction. Using structures that allow for poling to 2 × 106 V/cm uniform polarizations, the highest responsivities and improved frequency responses were obtained.