Measurements of the THz absorption and dispersion of ZnTe and their relevance to the electro-optic detection of THz radiation

Gallot, Guilhem; Zhang, Jiangquan; McGowan, R.W.; Jeon, Tae-In; Grischkowsky, D.

doi:10.1063/1.124124

Cited by 220 publications

(143 citation statements)

References 15 publications

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“…Note that if the magneto-optical effects are due to the free-electron response, the magnetization induced ellipticity and rotation are expected to show anomalies near the plasma frequency. For HgCdCr 2 Se 4 , the plasma frequency is expected to be in the order of 10 THz, 33,34 which is far beyond the ZnTe crystal response used for generation and detection of the THz radiation 35 and thus will be the subject of future studies.…”

mentioning

confidence: 99%

Terahertz magneto-optics in the ferromagnetic semiconductor HgCdCr2Se4

Huisman

Mikhaylovskiy

Telegin

et al. 2015

Applied Physics Letters

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The magneto-optical response of the ferromagnetic semiconductor HgCdCr2Se4 at terahertz (THz) frequencies is studied using polarization sensitive THz time-domain spectroscopy. It is shown that the polarization state of broadband terahertz pulses, with a spectrum spanning from 0.2 THz to 2.2 THz, changes as an even function of the magnetization of the medium. Analysing the ellipticity and the rotation of the polarization of the THz radiation, we show that these effects originate from linear birefringence and dichroism, respectively, induced by the magnetic ordering. These effects are rather strong and reach 102 rad/m at an applied field of 1 kG which saturates the magnetization of the sample. Our observation serves as a proof-of-principle showing strong effects of the magnetic order on the response of a medium to electric fields at THz frequencies. These experiments also suggest the feasibility of spin-dependent transport measurements on a sub-picosecond timescale.

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mentioning

confidence: 99%

Terahertz magneto-optics in the ferromagnetic semiconductor HgCdCr2Se4

Huisman

Mikhaylovskiy

Telegin

et al. 2015

Applied Physics Letters

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“…For Ref. [14] we use: For the simulations in the following sections we consider the first set of parameters. We will discuss the second set of parameters in appendix A where we analyze the influence of parameter uncertainties on the simulated EOS signal.…”

Section: Thz Rangementioning

confidence: 99%

“…27. For comparison the signal obtained with the parameters used in the previous sections [14] is also shown. A difference (σ z = 10 µm) obtained with the parameters from Ref.…”

Section: Appendix a Influence Of Parameters Uncertainties On The Eo Smentioning

confidence: 99%

Numerical Studies on the Electro-Optic Sampling of Relativistic Electron Bunches

Casalbuoni

Schlarb

Schmidt

et al.

Proceedings of the 2005 Particle Accelerator Conference

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At the 1 GeV electron linac of the DESY vacuum-ultraviolet free-electron laser an electro-optic (EO) sampling experiment has been installed permitting to measure the time structure of the bunches with high resolution. The transient electric field of the relativistic bunch corresponds to a sub-picosecond THz pulse which induces a birefringence in an electro-optic crystal. The sampling of the resulting polarization anisotropy by femtosecond laser pulses is studied in detailed numerical calculations. The THz and the laser pulses are treated as wave packets which propagate in the zinc telluride resp. gallium phosphide crystals. Using experimental data on the material properties of ZnTe and GaP the effects of signal broadening and distortion are explicitely taken into account. The most severe limitation on the time resolution is given by the transverse optical (TO) lattice oscillation in the EO crystal. The lowest TO frequency is 5.3 THz in ZnTe and 11 THz in GaP. The shortest bunch length which can be resolved with moderate distortion amounts to about 200 fs (FWHM) in ZnTe and 100 fs in GaP. The influence of the crystal thickness on the amplitude and width of the EO signal is studied. The optimum thickness is in the range from 100 to 300 µm. Multiple internal reflections can be suppressed by using a wedge-shaped EO crystal.

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“…The code uses the dispersion and second order susceptibility relationships discussed in Refs. [35,36]. A comparison between the experimental data for the refractive index and extinction coefficient and the equations used for the numerical solution is shown in Fig.…”

Section: Bandwidth Mixing Cross-correlation Frequency Resolved Omentioning

confidence: 99%

Extending electro-optic detection to ultrashort electron beams

Helle

Gordon

Kaganovich

et al. 2012

Phys. Rev. ST Accel. Beams

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We propose a technique to extend noninvasive electro-optic detection of relativistic electron beams to bunch lengths of ' 10 fs. This is made possible by detecting the frequency mixing that occurs between the optical probe and the space charge fields of the beam, while simultaneously time resolving the resulting mixed frequency signal. The necessary formalism to describe this technique is developed and numerical solutions for various possible experimental conditions are made. These solutions are then compared to simulation results for consistency. Finally, the method to reconstruct the original bunch profile from the proposed diagnostic is discussed and an example showing a 15 fs test beam reconstructed to within an accuracy of 15% is given.

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Measurements of the THz absorption and dispersion of ZnTe and their relevance to the electro-optic detection of THz radiation

Cited by 220 publications

References 15 publications

Terahertz magneto-optics in the ferromagnetic semiconductor HgCdCr2Se4

Terahertz magneto-optics in the ferromagnetic semiconductor HgCdCr2Se4

Numerical Studies on the Electro-Optic Sampling of Relativistic Electron Bunches

Extending electro-optic detection to ultrashort electron beams

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