Terahertz Radiation Detection by Field Effect Transistor in Magnetic Field

TL;DR

This paper demonstrates terahertz radiation detection using InGaAs/InAlAs FETs in a magnetic field, revealing oscillations and resonance effects explained by plasma wave rectification theory.

Contribution

It provides experimental evidence of terahertz detection in magnetic fields and confirms the plasma wave rectification mechanism with quantitative agreement.

Findings

Detection signal shows Shubnikov-de Haas oscillations.

Strong enhancement at cyclotron resonance.

Quantitative agreement with recent theoretical models.

Abstract

We report on terahertz radiation detection with InGaAs/InAlAs Field Effect Transistors in quantizing magnetic field. The photovoltaic detection signal is investigated at 4.2 K as a function of the gate voltage and magnetic field. Oscillations analogous to the Shubnikov-de Haas oscillations, as well as their strong enhancement at the cyclotron resonance, are observed. The results are quantitatively described by a recent theory, showing that the detection is due to rectification of the terahertz radiation by plasma waves related nonlinearities in the gated part of the channel.