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, roomerature 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.
|Proceedings of SPIE - The International Society for Optical Engineering
|Published - 20 Aug 2020
|Terahertz Emitters, Receivers, and Applications XI 2020 - Virtual, Online, United States
Duration: 24 Aug 2020 → 4 Sept 2020
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The authors thank D. Livshits from Innolume GmBH and Edmund Clark of the EPSRC National Centre for III-V Technologies, Sheffield, UK for QD samples growth and Richard Beanland from Integrity Scientific Ltd. for TEM image of a quantum dot. Also, we acknowledge Dr. Ross Leyman, for pioneering these experiments. This work was supported in part by EPSRC [Grant No EP/H015795/1] and FP7 IAPP TERA [project No 285974], and RFBR [Grants No. 18-07-01492 A and 16-07-01166 A]. Sample growth was funded by the NEXPRESSO program. A.G. thanks Magicplot LLC for providing a copy of MagicPlot Pro plotting and fitting software; and Vsevolod Gorodetsky for the assistance with illustrations.
- Compact THz setups
- Photoconductive antennas
- Quantum dot lasers
- THz imaging
- THz spectroscopy