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Terahertz Time-Domain Spectroscopy Based on Commercially Available 1550 nm Fabry–Perot Laser Diode and ErAs:In(Al)GaAs Photoconductors
Open AccessArticle

THz Superradiance from a GaAs: ErAs Quantum Dot Array at Room Temperature

Departments of Physics and Electrical Engineering Wright State University, Dayton, OH 45435, USA
TeraPico, LLC, Beavercreek, OH 45431, USA
Applied Physics Division, National Institute of Standards and Technology, Boulder, CO 80305, USA
TeTech S, Suite 3, 170 Columbia, W. Waterloo, Ontario, ON N2L 3L3, Canada
Authors to whom correspondence should be addressed.
Appl. Sci. 2019, 9(15), 3014;
Received: 22 June 2019 / Revised: 21 July 2019 / Accepted: 22 July 2019 / Published: 26 July 2019
(This article belongs to the Special Issue Terahertz and Far Infrared Pulsed Devices and Systems)
We report that an ErAs quantum-dot array in a GaAs matrix under 1550 nm pulsed excitation produces cooperative spontaneous emission—Dicke superradiance—in the terahertz frequency region at room temperature. Two key points pertain to the experimental evidence: (i) the pulsed THz emission power is much greater than the continuous wave (CW) photomixing power; and (ii) the ultrafast time-domain waveform displays ringing cycles. A record of ~117 μW pulsed THz power was obtained, with a 1550 nm-to-THz power conversion efficiency of ~0.2%. View Full-Text
Keywords: ErAs; quantum dot; superradiance; THz; 1550 nm; pulsed laser ErAs; quantum dot; superradiance; THz; 1550 nm; pulsed laser
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MDPI and ACS Style

Zhang, W.; Brown, E.R.; Mingardi, A.; Mirin, R.P.; Jahed, N.; Saeedkia, D. THz Superradiance from a GaAs: ErAs Quantum Dot Array at Room Temperature. Appl. Sci. 2019, 9, 3014.

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