Demonstration of a Tunable Antenna-Coupled Intersubband Terahertz (TACIT) Mixer
Changyun Yoo, Mengchen Huang, Jonathan Kawamura, Kenneth West, Loren, Pfeiffer, Boris Karasik, Mark Sherwin
TL;DR
This paper presents a voltage-tunable terahertz mixer using a high-mobility 2DEG in a GaAs-AlGaAs quantum well, demonstrating frequency tuning from 2.52 to 3.11 THz and mixing capabilities at 60 K.
Contribution
It introduces the TACIT mixer, a novel device with voltage-controlled tunability and broad IF bandwidth for terahertz detection.
Findings
Tunable detection frequency range of 2.52 to 3.11 THz.
Mixing observed at 2.52 THz at 60 K.
IF bandwidth exceeds 6 GHz.
Abstract
A fast, voltage-tunable terahertz mixer based on the intersubband transition of a high-mobility 2-dimensional electron gas (2DEG) has been fabricated from a single 40 nm GaAs-AlGaAs square quantum well heterostructure. The device is called a Tunable Antenna-Coupled Intersubband Terahertz (TACIT) mixer, and shows tunability of the detection frequency from 2.52 THz to 3.11 THz with small (< 1 V) top gate and back gate voltage biases. Mixing at 2.52 THz has been observed at 60 K with a -3dB intermediate frequency (IF) bandwidth exceeding 6 GHz.
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