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.

中文翻译：

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可调谐天线耦合子带间太赫兹 (TACIT) 混频器的演示

基于高迁移率二维电子气 (2DEG) 子带间跃迁的快速电压可调太赫兹混频器已由单个 40 nm GaAs-AlGaAs 方形量子阱异质结构制成。该器件称为可调谐天线耦合子带间太赫兹 (TACIT) 混频器，显示检测频率从 2.52 THz 到 3.11 THz 的可调性，顶栅和背栅电压偏置较小 (< 1 V)。在 60 K 下观察到 2.52 THz 的混频，-3dB 中频 (IF) 带宽超过 6 GHz。