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.
@article{arxiv.1910.01664,
title = {Demonstration of a Tunable Antenna-Coupled Intersubband Terahertz (TACIT) Mixer},
author = {Changyun Yoo and Mengchen Huang and Jonathan Kawamura and Kenneth West and Loren Pfeiffer and Boris Karasik and Mark Sherwin},
journal= {arXiv preprint arXiv:1910.01664},
year = {2020}
}
Comments
20 pages; 9 figures; the manuscript has been submitted for the Applied Physics Letters. This submission includes supplementary material