Quantum dot photoconductive antenna-based compact setups for terahertz spectroscopy and imaging

Andrei Gorodetsky; Amit Yadav; Semen Smirnov; Natalia Bazieva; Edik U. Rafailov

doi:10.1117/12.2567630

Quantum dot photoconductive antenna-based compact setups for terahertz spectroscopy and imaging

Andrei Gorodetsky^*, Amit Yadav, Semen Smirnov, Natalia Bazieva, Edik U. Rafailov

^*Corresponding author for this work

Research output: Contribution to journal › Conference article › peer-review

Abstract

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.

Original language	English
Article number	1149905
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	11499
DOIs	https://doi.org/10.1117/12.2567630
Publication status	Published - 20 Aug 2020
Event	Terahertz Emitters, Receivers, and Applications XI 2020 - Virtual, Online, United States Duration: 24 Aug 2020 → 4 Sept 2020

Bibliographical note

Copyright 2020 SPIE. One print or electronic copy may be made for personal use only. Systematic reproduction, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

Funding Information:
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.

Keywords

Compact THz setups
Photoconductive antennas
Quantum dot lasers
THz imaging
THz spectroscopy

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10.1117/12.2567630

1149905
Copyright 2020 SPIE. One print or electronic copy may be made for personal use only. Systematic reproduction, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Final published version, 1.46 MB

Cite this

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title = "Quantum dot photoconductive antenna-based compact setups for terahertz spectroscopy and imaging",

abstract = "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. ",

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note = "Copyright 2020 SPIE. One print or electronic copy may be made for personal use only. Systematic reproduction, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. Funding Information: 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. ; Terahertz Emitters, Receivers, and Applications XI 2020 ; Conference date: 24-08-2020 Through 04-09-2020",

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N2 - 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.

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Quantum dot photoconductive antenna-based compact setups for terahertz spectroscopy and imaging

Abstract

Bibliographical note

Keywords

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