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Finite-Element Analysis of Three-Dimensional Polarization Mapping with Pulsed Diode Lasers

Measuring the distribution of electrical polarization and space charge with focused thermal pulses or waves is one of the basic characterization techniques in electret research. However, in multi-layer systems, reconstructing the polarization from the measured transient current requires a multi-physics approach using finite element analysis. This method is feasible for investigating a range of geometries, including samples with buried light-absorbing electrodes. The present work shows the modeling of the transient thermal-pulse current for a metal-polymer-metal sample, heated on one side with a 15~μs Gaussian-shaped laser beam.