Abstract
THz-bandwidth pulses are generated, transmitted along a gold-plated stainless steel metallic slit waveguide, and detected with 1.5 THz bandwidth and 60 dB dynamic range. The source and detector were edge-pumped slotlines on LT-GaAs placed within the near-field region of the waveguide entrance and exit aperture. The motivation for this work was to develop a complete dispersion-free THz system which was simple to manufacture and could be utilized for free-space waveguide experimentation.
Highlights
Photoconductive pulse generation and detection on a substrate was investigated in the 1980s [1,2,3,4,5]
The source and detector were edge-pumped slotlines on LT-GaAs placed within the near-field region of the waveguide entrance and exit aperture
ConclusionWe have demonstrated THz-bandwidth pulse generation, transmission and detection over a MSWG, showing that using near-field coupling for waveguide excitation and detection can be both simple and effective
Summary
Photoconductive pulse generation and detection on a substrate was investigated in the 1980s [1,2,3,4,5]. In [5] the sliding contact is slightly modified to generate short pulses from a long-carrier-lifetime substrate This was achieved by asymmetrically exciting the transmission line. In the previously cited work the transmission lines consisted of metallic contacts deposited on a thick dielectric substrate. This configuration is undesirable because of leaky-wave radiation [6]. The method of waveguide excitation is similar to past work [12], but here the THz source is a DC biased edge-pumped slotline which minimizes the pulse distortion by eliminating reflections associated with the bias lines. THz field detection is achieved by tapering the MSWG onto an edge-pumped slotline detector which located within the near-field region of the exit aperture of MSWG. Other near-field detectors exist [14,15,16] which could potentially be utilized, but the manufacturing procedure for these detectors is difficult in comparison to a simple cleaved slotline
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