On-chip terahertz Goubau-line waveguides with integrated photoconductive emitters and mode-discriminating detectors

Dazhang, L.; Cunningham, J.; Byrne, M. B.; Khanna, S.; Wood, C. D.; Burnett, A. D.; Ershad, S. M.; Linfield, E. H.; Davies, A. G.
August 2009
Applied Physics Letters;8/31/2009, Vol. 95 Issue 9, p092903
Academic Journal
We have measured the picosecond time-domain response of Goubau-line waveguides, formed on quartz substrates, by integrating regions of low-temperature-grown gallium arsenide into the waveguides to act both as pulsed current emitters and detectors. Using one pair of photoconductive switches for excitation and a second pair for detection, pulsed signal propagation of a low dispersion electric field mode was demonstrated in the Goubau-lines, with the signal bandwidth extending beyond 800 GHz. Furthermore, it was demonstrated that terahertz bandstop filters can be integrated into a Goubau-line for removal of specific frequencies from the transmitted pulses.


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