Single-shot terahertz time-domain spectroscopy in pulsed high magnetic fields

Noe, G. Timothy; Katayama, Ikufumi; Katsutani, Fumiya; Allred, James J.; Horowitz, Jennifer; Sullivan, David M.; Zhang, Qi; Sekiguchi, Fumiya; Woods, Gary; Hoffmann, Matthias C.; Nojiri, Hiroyuki; Takeda, Jun; Kono, Junichiro

doi:10.1364/oe.24.030328

Cited by 43 publications

(23 citation statements)

References 31 publications

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“…We decided for transmissive 26,30 instead of the more commonly used reflective echelons. 28,[31][32][33] The latter are typically CNC (computerized numerical control) machined single pieces of metal. However, we found that it was impossible to produce optically flat steps of the required size in that way.…”

Section: A 2d-raman-thz Implementationmentioning

confidence: 99%

2D-Raman-THz spectroscopy with single-shot THz detection

Duchi

Shukla

Shalit

et al. 2021

The Journal of Chemical Physics

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We present a 2D-Raman-THz setup with multichannel (single-shot) THz detection, utilizing two crossed echelons, in order to reduce the acquisition time of typical 2D-Raman-THz experiments from days to a few hours. This speed-up is obtained in combination with a high repetition rate (100 kHz) Yb-based femtosecond laser system and a correspondingly fast array detector. The wavelength of the Yb-laser (1030 nm) is advantageous, since it assures almost perfect phase matching in GaP for THz generation and detection, and since dispersion in the transmissive echelons is minimal. 2D-Raman-THz test measurements on liquid bromoform (CHBr3) are reported. An enhancement of 5.8 times in signal-to-noise ratio is obtained for single-shot detection when comparing to conventional step scanning measurements in the THz time-domain, corresponding to speed up of acquisition time of 34.

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Section: A 2d-raman-thz Implementationmentioning

confidence: 99%

2D-Raman-THz spectroscopy with single-shot THz detection

Duchi

Shukla

Shalit

et al. 2021

The Journal of Chemical Physics

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“…In addition to using a standard delay-stage-based stepscan THz setup combined with a 10-T superconducting magnet [45][46][47][48][49][50][51][52], we used a unique single-shot THz setup to perform measurements in pulsed magnetic fields up to 30 T [40]. Pulsed magnets typically generate higher magnetic fields with a smaller magnet and cryostat size than DC magnets, but the challenge is that the peak magnetic field only lasts for a short time (approximately 400 µs in our case [38]), so that the time for a delay stage to step through the THz waveform is insufficient.…”

Section: Single-shot Thz Spectroscopy In Pulsed High Magnetic Fieldsmentioning

confidence: 99%

“…1) is well established [10,13,[34][35][36], although some controversy remains as to whether surface states in the SM region are topologically nontrivial [37]. We performed measurements using a single-shot THz time-domain polarimetry setup combined with a 30-T pulsed magnet system [38][39][40]. The wide tunability of the band structure of Bi 1−x Sb x with x makes this material system suitable for identifying and distinguishing the uniquely different magneto-optical responses of samples in the topologically trivial and nontrivial phases.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Faraday and Kerr rotation spectroscopy of Bi1−xSbx films in high magnetic fields up to 30 tesla

Yoshioka

Xie

et al. 2019

Phys. Rev. B

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We report results of terahertz Faraday and Kerr rotation spectroscopy measurements on thin films of Bi1−xSbx, an alloy system that exhibits a semimetal-to-topological-insulator transition as the Sb composition x increases. By using a single-shot time-domain terahertz spectroscopy setup combined with a table-top pulsed mini-coil magnet, we conducted measurements in magnetic fields up to 30 T, observing distinctly different behaviors between semimetallic (x < 0.07) and topological insulator (x > 0.07) samples. Faraday and Kerr rotation spectra for the semimetallic films showed a pronounced dip that blue-shifted with the magnetic field, whereas spectra for the topological insulator films were positive and featureless, increasing in amplitude with increasing magnetic field and eventually saturating at high fields (>20 T). Ellipticity spectra for the semimetallic films showed resonances, whereas the topological insulator films showed no detectable ellipticity. To explain these observations, we developed a theoretical model based on realistic band parameters and the Kubo formula for calculating the optical conductivity of Landau-quantized charge carriers. Our calculations quantitatively reproduced all experimental features, establishing that the Faraday and Kerr signals in the semimetallic films predominantly arise from bulk hole cyclotron resonances while the signals in the topological insulator films represent combined effects of surface carriers originating from multiple electron and hole pockets. These results demonstrate that the use of high magnetic fields in terahertz magnetopolarimetry, combined with detailed electronic structure and conductivity calculations, allows us to unambiguously identify and quantitatively determine unique contributions from different species of carriers of topological and nontopological nature in Bi1−xSbx. arXiv:1907.00137v1 [cond-mat.mes-hall]

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“…Сейчас для преобразования одиночного ультракороткого импульса в серию эквидистантных во времени в пространстве копий используются конструкции типа эшелона Майкельсона [23,24]. Одной из систем, обеспечивающих аналогичное повторение и используемых для решения задач поиска и изучения свойств экзопланет, сегодня является стремительно развивающаяся техника, имеющая в своей основе интерферометр Фабри−Перо (ИФП).…”

Section: фильтр на основе зеркала (линзы) френеляunclassified