For photoconductive (PC) antennae used as terahertz (THz) detectors, traditional data processing methods should be improved because the space-charge and radiation field screening effects and the time dependence of photocarriers density have not been considered. Through developing a double-probe-pulse THz detection technique and using an equivalent-circuit model to describe PC antennae, we present a new method to restore the THz-field wave shape from the measurement data of currents between two electrodes on the antenna. This method is verified to be effective through building a special THz time-domain spectroscopy system with double probes. This work is significant for the accurate determination of pulse THz fields.
© 2013 Optical Society of America
Original Manuscript: April 25, 2013
Manuscript Accepted: May 21, 2013
Published: June 25, 2013
Jinsong Liu, Si Zou, Zhengang Yang, Kejia Wang, and Kefei Ye, "Wave shape recovery for terahertz pulse field detection via photoconductive antenna," Opt. Lett. 38, 2268-2270 (2013)