Single-Shot Terahertz Time-Domain Spectroscopy in Pulsed High Magnetic Fields

TL;DR

This paper introduces a novel single-shot terahertz time-domain spectrometer capable of operating in pulsed high magnetic fields up to 30 T, enabling advanced optical-pump/terahertz-probe experiments.

Contribution

The authors developed a new detection scheme using a reflective echelon and imaging to retrieve terahertz waveforms in high magnetic fields, which was not previously available.

Findings

Successfully measured cyclotron resonance in silicon at high magnetic fields

Results agree with published values, validating the technique

Enables new experiments in pulsed high magnetic field environments

Abstract

We have developed a single-shot terahertz time-domain spectrometer to perform optical-pump/terahertz-probe experiments in pulsed, high magnetic fields up to 30 T. The single-shot detection scheme for measuring a terahertz waveform incorporates a reflective echelon to create time-delayed beamlets across the intensity profile of the optical gate beam before it spatially and temporally overlaps with the terahertz radiation in a ZnTe detection crystal. After imaging the gate beam onto a camera, we can retrieve the terahertz time-domain waveform by analyzing the resulting image. To demonstrate the utility of our technique, we measured cyclotron resonance absorption of optically excited carriers in the terahertz frequency range in intrinsic silicon at high magnetic fields, with results that agree well with published values.