Study of High-Power Wideband Terahertz-Pulse Generation Using Integrated High-Speed Photoconductive Semiconductor Switches

A 3-D finite-difference time-domain analysis of a photoconductive-semiconductor-switch-based terahertz (THz) source, integrated with a standard dipole and a large-aperture radiator, is presented. The simulation analysis is based on the coupling of semiconductor equations for charge transport with Ma...

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Bibliographic Details
Published in:IEEE transactions on plasma science 2009-01, Vol.37 (1), p.219-228
Main Authors: Kirawanich, P., Yakura, S.J., Islam, N.E.
Format: Article
Language:English
Subjects:
Acceleration
Antennas
Character generation
Devices
Dipole antennas
Electromagnetic coupling
Electromagnetics
Exact sciences and technology
Finite difference methods
Finite element analysis
Finite-difference time-domain (FDTD) method
high-power photoconductive antenna
Mathematical analysis
Maxwell equations
Nonlinear equations
Photoconducting devices
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
Plasma physics
Plasma properties
Radiators
Semiconductors
Simulation
Switches
terahertz (THz)-pulse generation
Three dimensional
Time domain analysis
Transport properties
Wideband
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Summary:A 3-D finite-difference time-domain analysis of a photoconductive-semiconductor-switch-based terahertz (THz) source, integrated with a standard dipole and a large-aperture radiator, is presented. The simulation analysis is based on the coupling of semiconductor equations for charge transport with Maxwell electromagnetic equations. The simulation provides the transient field redistribution, carrier generation characteristics, and the field acceleration as a result of the bias voltage on the device, contributing to the nonlinear behavior of THz-pulse generation. A comparison of the radiation characteristics of the two antenna types shows that the large-aperture antenna produces approximately three times higher radiation amplitude and broader power spectrum than those produced by the dipole antenna.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2008.2006978