Photoconductive terahertz antenna for producing or receiving high frequency electromagnetic radiation in terahertz range, has top semiconductor layer system with optical thickness equal to quarter wavelength of laser pulse

摘要

The antenna has multiple specific semiconductor layer systems (5), where each system has a middle layer (6) that works in an absorbing manner for the light of a laser pulse. Each system has two outer layers with a larger band gap than the photon energy of the laser pulse. A top semiconductor layer system (9) has an optical thickness equal to a quarter wavelength of the laser pulse. The system (9) has an uppermost absorbing layer (10) with a larger band gap than the photon energy of the laser pulse, where the band gap is low compared to the total thickness of the system (9).