2-D Numerical Simulation and Analysis of a Simple Band Model for the Priz SpatialLight Modulator

摘要

This dissertation discusses the development of and analyzes the first complete, 2-D numerical simulation of the PRIZ. The simulation is based upon a simple band model of the PRIZ: a single donor, a single trap, and free electron carriers. Modeled mechanisms include photogeneration, energy level transitions, injection, drift currents, diffusion currents, photorefraction and diffraction. The model goes beyond the previous charge and field dynamics of 1-D numerical models to include optical effects, and it eliminates the oversimplifications and assumptions used in earlier mathematical models with closed solutions. Sensitivity analyses and selected simulations provide a better understanding of the dynamic imaging phenomena. The device output depends on the relative dominance or strength of the fields in the positive or negative space charge region. Transverse drift is as important as charge mirror imaging and injection current in determining peak output and self-erasure. The simulations show a broad range of unreported behavior both before and after writ-beam turnoff, including sharp transients; reintensification with and without phase reversals; and even strong intensification after a turnoff. Finally, the 2-D model is shown to be a reasonable representation of the PRIZ by comparing simulated output with experimental data from the literature.