This work presents the generation of pulsed THz radiation from a quantum dot photoconductive antenna (PCA) pumped at 800nm. The work investigates the output and characteristics of the generated THz from the QD PCA alongside a comparison with a commercial antenna from Teravil. The QD PCA outputs significantly higher THz power at low pump powers than the commercial PCA and would therefore be suitable for any application that would require a low-pump power such as the use of semiconductor lasers as pump sources for THz generation.
We present the overview of the results on the development of compact THz setups based on the quantum dot photoconductive antennas obtained during the past five years. We demonstrate the potential of the InAs/GaAs Quantum-Dot based setups to become an efficient approach to compact, room-temperature operating CW and pulsed terahertz setups for spectroscopy and imaging. We describe the photoelectronic processes in quantum dot substrates and reveal the role of quantum dots in free carrier lifetimes and the formation of the ultrafast photocurrent. We demonstrate the operation mode of the proposed antennas in pulsed and CW regimes under resonant (carriers are excited only inside the quantum dots) and off-resonant (carriers are excited in the bulk volume of the substrate) pumps with compact quantum dot semiconductor lasers. The results allow suggesting the quantum dot based setups as a new approach to field condition compact THz sources for imaging and spectroscopy.
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