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Photonics 2019, 6(1), 15; https://doi.org/10.3390/photonics6010015

International System of Units (SI) Traceable Noise-Equivalent Power and Responsivity Characterization of Continuous Wave ErAs:InGaAs Photoconductive Terahertz Detectors

1
Terahertz Devices and Systems, Department of Electrical Engineering and Information Technology, Technische Universität Darmstadt, Merckstr. 25, 64283 Darmstadt, Germany
2
TOPTICA Photonics AG, Lochhamer Schlag 19, D-82166 Gräfelfing, Germany
3
College of Engineering and Applied Sciences, Nanjing University, Hankou Road 22, Nanjing 210093, China
4
Materials Department, University of California Santa Barbara, Santa Barbara, CA 93106, USA
*
Author to whom correspondence should be addressed.
Received: 14 December 2018 / Revised: 30 January 2019 / Accepted: 7 February 2019 / Published: 13 February 2019
(This article belongs to the Special Issue Terahertz Photonics)
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Abstract

A theoretical model for the responsivity and noise-equivalent power (NEP) of photoconductive antennas (PCAs) as coherent, homodyne THz detectors is presented. The model is validated by comparison to experimental values obtained for two ErAs:InGaAs PCAs. The responsivity and NEP were obtained from the measured rectified current, the current noise floor in the PCAs, and the incoming THz power for the same conditions. Since the THz power measurements are performed with a pyroelectric detector calibrated by the National Metrology Institute of Germany (PTB), the experimentally obtained values are directly traceable to the International System of Units (SI) for the described conditions. The agreement between the presented model and the experimental results is excellent using only one fitting parameter. A very low NEP of 1.8 fW/Hz at 188.8 GHz is obtained at room temperature. View Full-Text
Keywords: Coherent THz detectors; photoconductive antennas; responsivity; NEP; homodyne detection Coherent THz detectors; photoconductive antennas; responsivity; NEP; homodyne detection
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Fernandez Olvera, A.J.; Roggenbuck, A.; Dutzi, K.; Vieweg, N.; Lu, H.; Gossard, A.C.; Preu, S. International System of Units (SI) Traceable Noise-Equivalent Power and Responsivity Characterization of Continuous Wave ErAs:InGaAs Photoconductive Terahertz Detectors. Photonics 2019, 6, 15.

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