Abstract
We present a novel approach for terahertz time-domain spectroscopy of magneto-optic phenomena. The setup used in this work combines a tabletop pulsed magnet and a standard terahertz time-domain spectroscopy system. The approach is based on repetitive operation of the pulsed magnet and step-wise increment of the delay time of the time-domain spectroscopy system. The method is demonstrated by plotting the magneto-transmission spectra of linearly polarized THz pulses through the hole gas of a Ge sample and the electron gas of GaAs, InSb and InAs samples. Cyclotron resonance spectra are displayed in the frequency range from 200 GHz to 2 THz and for a magnetic field up to 6 T. The GaAs spectra are analyzed in more detail using simulations based on the Drude model.
Highlights
Terahertz (THz) time-domain spectroscopy (TDS) is becoming most attractive for measuring optical properties of condensed matter systems at THz frequencies and under exposure to high magnetic fields [1,2,3,4,5,6,7]
We present a novel approach for terahertz time-domain spectroscopy of magneto-optic phenomena
We present a novel approach to measure magneto-optical phenomena, that is based on the repetitive operation of a portable, short-duration (FWHM pulse duration of about 2.5 ms) pulsed magnet placed in a standard THz TDS system [11]
Summary
Terahertz (THz) time-domain spectroscopy (TDS) is becoming most attractive for measuring optical properties of condensed matter systems at THz frequencies and under exposure to high magnetic fields [1,2,3,4,5,6,7]. We have measured a set of cyclotron resonance spectra in p-doped germanium (p-Ge) in the time domain and at very high speed during a single sweep of a long-duration pulsed magnet [9]. For this experiment, a portable, fiber-coupled THz TDS system [10] employing a high-speed delay line was operated at a pulsed magnet facility. Two-dimensional plots representing the relative change of THz transmittance versus frequency and magnetic field are presented for a frequency range from 200 GHz to 2 THz and a magnetic field up to 6 T
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