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Subpicosecond Electrical Pulse Generation by Nonuniform Gap IlluminationAbstract
Subpicosecond electrical pulse generation by nonuniform gap illumination of GaAs/Si coplaner transmission lines is investigated using 1-D Monte Carlo and 2-D/3-D numerical simulations. The electrical pulse dependence (including amplitude, delay, rise time, and shape) on light intensity, wavelength, beam size and location, as well as bias voltage has been extensively studied. The theory on the physical mechanism of nonuniform illumination is established, which is consistent with other theories such as full-wave analysis. The simulation results are in qualitative agreement with experimental observations as well as the dielectric-relaxation interpretation based on an equivalent circuit model.