PROJECT TITLE :

Enhanced terahertz emission from photoconductive antenna with ohmic contact electrodes biased by out-of-phase voltages

ABSTRACT :

Terahertz emission power is one in every of the main obstacles for photoconductive antenna applications. In typical photoconductive antennas, the electrical field distributes during a slender area close to to the anode, that limits the emission efficiency. A SI-GaAs antenna with AuGeNi ohmic contact electrodes was ready by the current authors' improved fabrication technology, and the electrical field distributes more evenly when one electrode was biased by a DC sq. wave pulse or 2 electrodes were biased by two DC square wave pulses with opposed phases. Compared with the conventional antennas, the terahertz emission efficiency of the antenna was improved by one order when biased by the out-of-phase voltages and illuminating the full antenna gap to suppress the carrier screening and radiation screening.


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