ISSTT Proceedings

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Terahertz-Bandwidth Transmission Lines on Low-Permittivity Substrates

Authors:
H. Cheng, J.F. Whitaker, T.M. Weller, L.P.B. Katehi
Abstract:
Coplanar waveguides and coplanar striplines fabricated on different substrates-including GaAs, quartz, and a 1.4 µm-thick dielectric membrane were characterized up to terahertz using a novel technique. This technique utilizes an in situ, laser-driven photoconductive switch to generate a subpicosecond electrical test pulse with a 3-dB bandwidth of over 500 GHz on the transmission line. The photoconductive switch is formed by first lifting-off a 1-µm-thick low-temperature-grown GaAs epi-layer from its original substrate. This thin film, while supported by the wax, is then bonded to the new substrate using a van der Waals force bond. By monitoring the pulse propagation along the transmission line with a non-contacting electro-optic sampling probe, the attenuation coefficients have been determined through the Fourier transform of the time-domain wavforms.
Categories:
Components, Quasi Optics
Year:
1994
Session:
10
Full-text:
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Page Number(s):
698-699