Propagation Characteristics of Terahertz Electrical Signals on Micro-Strip Lines Made of Optically Transparent Conductors

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We investigated the propagation properties of terahertz (THz) electrical pulses in micro-strip lines (MSLs) in which the signal line or the ground plane is made of indium–tin–oxide (ITO), which is a widely used transparent conductor. Finite-difference time-domain calculations showed that, in cases where ITO is used as the ground plane, an amplitude attenuation of as low as $\alpha\sim 0.35$ mm-1 (3 dB/mm) can be realized at 1 THz. It was also found that the use of the dc value for conductivity for ITO results in a slightly larger value for the attenuation. In experiments, although the conductivity of the ITO film was not sufficiently high, clear picosecond electrical pulses were observed after 2 mm of propagation with nearly the same waveform and an amplitude only 30% smaller than those in metal-based MSLs. These results suggest that ITO can be used as a ground plane conductor in millimeter-scale MSLs in the THz range.
INSTITUTE OF PURE AND APPLIED PHYSICSの論文
2005-07-10