Title :
Numerical investigation of subpicosecond electrical pulse generation by edge illumination of silicon transmission-line gaps
Author :
Zhou, Xing ; Tang, Tianwen ; Seah, Lee Seng ; Yap, Chong Jin ; Choo, Seok Cheow
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Inst., Singapore
fDate :
1/1/1998 12:00:00 AM
Abstract :
The phenomena involved in the subpicosecond electrical pulses generated by edge illumination of a charged coplanar transmission line on silicon substrate are investigated theoretically using a two-dimensional numerical model. The calculated terminal current, which is related to the observed electrical signal, is interpreted as being due to the dielectric relaxation of the spacecharge field based on an equivalent circuit model. The pulse dependence (including amplitude, delay, rise time, and shape) on the wavelength of the laser source is investigated in terms of light penetration and the generated photocarriers. The frequency limit of the laser pulse train is determined theoretically for different carrier lifetimes. The simulation results are in qualitative agreement with experimental observations, and the dielectric relaxation interpretation is consistent with other theories based on the full-wave analysis and the Monte Carlo model
Keywords :
Monte Carlo methods; carrier lifetime; elemental semiconductors; high-speed optical techniques; laser beam effects; pulse generators; silicon; space charge; transmission lines; Si; calculated terminal current; carrier lifetimes; charged coplanar transmission line; dielectric relaxation; dielectric relaxation interpretation; edge illumination; equivalent circuit model; frequency limit; generated photocarriers; laser pulse train; laser source wavelength; light penetration; observed electrical signal; optical pulse generation; optical pulse shape; pulse dependence; rise time; silicon substrate; silicon transmission-line gaps; spacecharge field; subpicosecond electrical pulse generation; two-dimensional numerical model; Coplanar transmission lines; Dielectric substrates; Equivalent circuits; Laser modes; Laser theory; Lighting; Numerical models; Optical pulse generation; Pulse generation; Silicon;
Journal_Title :
Quantum Electronics, IEEE Journal of
