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Effects of high space-charge fields on the response of microwave photodetectors

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3 Author(s)
K. J. Williams ; Naval Res. Lab., Washington, DC, USA ; R. D. Esman ; M. Dagenais

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.<>

Published in:

IEEE Photonics Technology Letters  (Volume:6 ,  Issue: 5 )