High-speed terahertz time-domain spectroscopy of cyclotron resonance in pulsed magnetic field

Molter, Daniel; Ellrich, Frank; Weinland, Tristan; George, Sylvie; Goiran, M.; Keilmann, F.; Beigang, R.; Leotin, J.

doi:10.1364/oe.18.026163

Cited by 46 publications

(32 citation statements)

References 9 publications

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“…9 There have also been several reports of cyclotron resonance spectrometers being developed that combine pulsed magnetic fields with broadband laser-based terahertz radiation sources. [10][11][12] Laser-based terahertz spectroscopy is a timedomain technique that typically employs slow scanning mechanical delay stages to acquire the terahertz waveforms through combining time-delayed near-infrared and terahertz pulses in a nonlinear medium or photoconductive antenna. The key challenge in utilizing these sources with pulsed magnetic fields has been in developing a detection scheme that can measure the terahertz waveforms within the several millisecond duration of the magnetic field.…”

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confidence: 99%

“…The key challenge in utilizing these sources with pulsed magnetic fields has been in developing a detection scheme that can measure the terahertz waveforms within the several millisecond duration of the magnetic field. Approaches to achieving this have included both replacing the slow mechanical delay stage with a fast rotating mirror 10 and using two lasers synchronized with an electronically controlled optical sampling (ECOPS) technique. 12 The ECOPS scheme was the most suitable method for use with short duration magnetic field pulses as Noe II et al 12 showed that it could be used to record four terahertz waveforms during an approximately 14 ms magnetic field pulse.…”

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confidence: 99%

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Terahertz cyclotron resonance spectroscopy of an AlGaN/GaN heterostructure using a high-field pulsed magnet and an asynchronous optical sampling technique

Spencer

Smith

Hibberd

et al. 2016

Applied Physics Letters

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The effective mass, sheet carrier concentration, and mobility of electrons within a two-dimensional electron gas in an AlGaN/GaN heterostructure were determined using a laboratory-based terahertz cyclotron resonance spectrometer. The ability to perform terahertz cyclotron resonance spectroscopy with magnetic fields of up to 31 T was enabled by combining a high-field pulsed magnet with a modified asynchronous optical sampling terahertz detection scheme. This scheme allowed around 100 transmitted terahertz waveforms to be recorded over the 14 ms magnetic field pulse duration. The sheet density and mobility were measured to be 8.0 × 1012 cm−2 and 9000 cm2 V−1 s−1 at 77 K. The in-plane electron effective mass at the band edge was determined to be 0.228 ± 0.002m0.

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confidence: 99%

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confidence: 99%

Terahertz cyclotron resonance spectroscopy of an AlGaN/GaN heterostructure using a high-field pulsed magnet and an asynchronous optical sampling technique

Spencer

Smith

Hibberd

et al. 2016

Applied Physics Letters

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“…To overcome the inertia of linear mechanical delay stages, rotating delay stages have been developed [126,127]. Recently such a rotating delay stage has been applied to measure cyclotron resonances of p-Ge in pulsed high magnetic fields [128]. With this system 135 cyclotron resonance spectra were obtained in 900 ms [128].…”

Section: Operation Of Scalable Microstructured Emitters With Amplifiementioning

confidence: 99%

Scalable Microstructured Photoconductive Terahertz Emitters

Winnerl

2011

J Infrared Milli Terahz Waves

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The development of scalable emitters for pulsed broadband terahertz (THz) radiation is reviewed. Their large active area in the 1 -100 mm 2 range allows for using the full power of state-of-the-art femtosecond lasers for excitation of charge carriers. Large fields for acceleration of the photogenerated carriers are achieved at moderate voltages by interdigitated electrodes. This results in efficient emission of single-cycle THz waves. THz field amplitudes in the range of 300 V/cm and 17 kV/cm are reached for excitation with 10 nJ pulses from Ti:sapphire oscillators and for excitation with 5 μJ pulses from amplified lasers, respectively. The corresponding efficiencies for conversion of near-infrared to THz radiation are 2.5×10 -4 (oscillator excitation) and 2×10 -3 (amplifier excitation). In this article the principle of operation of scalable emitters is explained and different technical realizations are described. We demonstrate that the scalable concept provides freedom for designing optimized antenna patterns for different polarization modes. In particular emitters for linearly, radially and azimuthally polarized radiation are discussed. The success story of photoconductive THz emitters is closely linked to the development of mode-locked Ti: sapphire lasers. GaAs is an ideal photoconductive material for THz emitters excited with Ti: sapphire lasers, which are widely used in research laboratories. For many applications, especially in industrial environments, however, fiber-based lasers are strongly preferred due to their lower cost, compactness and extremely stable operation. Designing photoconductive emitters on InGaAs materials, which have a low enough energy gap for excitation with fiber lasers, is challenging due to the electrical properties of the materials. We discuss why the challenges are even larger for microstructured THz emitters as compared to conventional photoconductive antennas and present first results of emitters suitable for excitation with ytterbium-based fiber lasers. Furthermore an alternative concept, namely the lateral photo-Dember emitter, is presented. Due to the strong THz output scalable emitters are well suited for THz systems with fast data acquisition. Here the application of scalable emitters in THz spectrometers without mechanical delay stages, providing THz spectra with 1 GHz spectral resolution and a signal-to-noise ratio of 37 dB within 1 s, is

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“…5 However, there has been only limited success in combining THz time-domain spectroscopy (THz-TDS) techniques with high magnetic fields. [6][7][8][9][10][11][12][13][14][15] In particular, combining THz-TDS with a pulsed magnet remains to be a significant technical challenge, 9,13,15 while magnetic fields stronger than 45 T can be generated only in pulsed form. 16 The traditional method for measuring a THz timedomain waveform generated using ultrashort laser pulses includes using a pump-probe scheme where one laser beam passes a beam splitter to make two synchronized pulses from one source.…”

Section: Introductionmentioning

confidence: 99%

Rapid scanning terahertz time-domain magnetospectroscopy with a table-top repetitive pulsed magnet

et al. 2014

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We have performed terahertz time-domain magnetospectroscopy by combining a rapid scanning terahertz time-domain spectrometer based on the electronically coupled optical sampling method with a table-top mini-coil pulsed magnet capable of producing magnetic fields up to 30 T. We demonstrate the capability of this system by measuring coherent cyclotron resonance oscillations in a high-mobility two-dimensional electron gas in GaAs and interference-induced terahertz transmittance modifications in a magnetoplasma in lightly doped n-InSb.

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High-speed terahertz time-domain spectroscopy of cyclotron resonance in pulsed magnetic field

Cited by 46 publications

References 9 publications

Terahertz cyclotron resonance spectroscopy of an AlGaN/GaN heterostructure using a high-field pulsed magnet and an asynchronous optical sampling technique

Terahertz cyclotron resonance spectroscopy of an AlGaN/GaN heterostructure using a high-field pulsed magnet and an asynchronous optical sampling technique

Scalable Microstructured Photoconductive Terahertz Emitters

Rapid scanning terahertz time-domain magnetospectroscopy with a table-top repetitive pulsed magnet

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