@inproceedings{e453daa1da694c76b2269cfb4fdb710f,
title = "Impedance models for tunable antenna-coupled intersubband terahertz (TACIT) mixers",
abstract = "Tunable antenna-coupled intersubband terahertz (TACIT) mixers are a new type of THz heterodyne detectors based on intersubband transitions in single GaAs/AlGaAs quantum wells. TACIT mixers have been predicted to have low single-sideband (SSB) noise temperature (a1/42,000 K) at 20-60 K with a wide IF bandwidth (a1/410 GHz) and a small required local-oscillator (LO) power (< 1 μW). In addition, the detection frequency of TACIT mixers can be tuned in-situ in a wide frequency range (2-5 THz). In TACIT mixers, THz signal (RF) channel is separated from GHz intermediate-frequency (IF) read-out channel, allowing individual optimization of the RF and IF channels for efficient impedance matching. We present simple equivalent-circuit models for the RF and IF channels of TACIT mixers and demonstrate that the RF and IF impedances calculated from the models are in good agreement with their indirect or direct experimental characterizations in prototype TACIT mixers. We show that the separately optimized RF and IF channels in practical TACIT mixers can yield high impedance matching efficiencies.",
keywords = "2-dimensinoal electron gas (2DEG), intersubband transitions, quantum well, THz heterodyne detector",
author = "C. Yoo and West, {K. W.} and Pfeiffer, {L. N.} and Kawamura, {J. H.} and Karasik, {B. S.} and Sherwin, {M. S.}",
note = "Publisher Copyright: {\textcopyright} 2022 SPIE.; Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI 2022 ; Conference date: 17-07-2022 Through 22-07-2022",
year = "2022",
doi = "10.1117/12.2630575",
language = "English (US)",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Jonas Zmuidzinas and Jian-Rong Gao",
booktitle = "Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI",
address = "United States",
}