Effects of high space-charge fields on the response of microwavephotodetectors |
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Authors: | Williams KJ Esman RD Dagenais M |
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Affiliation: | Naval Res. Lab., Washington, DC; |
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Abstract: | We present simulation results, based on a one-dimensional p-i-n photodetector model, to explain the reductions in photodetector response observed at high optical powers. The nonlinear effects are attributed to the redistribution of the internal electric field due to space-charge effects created by the photocarriers. The corresponding modification of the position-dependent charge velocities results in high-frequency response reduction, roll-off reduction, and pulse narrowing. Electric field redistribution leads to two dimensional effects, which must be included for accurate modeling of milliampere photocurrents |
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