Femtosecond electro-optic effect in (Cd,Mn)Te single crystals

Cross, A.; Kochanowska, D.; Witkowska-Baran, M.; Mycielski, A.; Mikulics, M.; Grützmacher, Detlev; Sobolewski, Roman

doi:10.1088/1742-6596/193/1/012057

Cited by 2 publications

(2 citation statements)

References 10 publications

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“…CdTe and ZnTe, because of their electro-optic properties, are commonly used as generators and detectors of THz radiation bursts [7,8]. Presence of magnetic Mn ions in CMnT turns this crystal into a magneto-optic material, exhibiting a giant Faraday effect [9] and, subsequently, a promising compound for ultrafast spintronics and magneto-optics [10,11], as well as femtosecond electro-optics [12]. Finally, the combined photoconductive (as a result of ultrahigh resistivity) and electro-optic effects in both CMgT and CMnT single crystals make them materials of choice for 'experiment-on-chip' measurements for future ultrafast characterization of various novel materials and devices [13,14].…”

Section: Introductionmentioning

confidence: 99%

Time-resolved, nonequilibrium carrier and coherent acoustic phonon dynamics in (Cd, Mg)Te single crystals for radiation detectors

Serafini¹,

Hossain²,

James³

et al. 2019

Semicond. Sci. Technol.

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LLE Review, Volume 15715 Volume-type radiation detectors are devices that collect charged particles, such as electrons, produced by photon interaction with the detector material, typically a single crystal. In the case of highly energetic x-ray radiation photons, they interact with matter through three main mechanisms: the photoelectric effect, the Compton effect, and electron-positron pair production. The photoelectric effect is by far the most dominant effect among them because Compton-scattered photons, as well as high-energy gammas from electron-pair annihilations, typically escape from the detection volume and their energy cannot be collected. Photoconductive devices are, in fact, the most popular solid-state radiation detectors since they can often operate at room temperature, cover the spectral range up to hard x rays and even c rays, and are easy to design and fabricate.

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Section: Introductionmentioning

confidence: 99%

Time-resolved, nonequilibrium carrier and coherent acoustic phonon dynamics in (Cd, Mg)Te single crystals for radiation detectors

Serafini¹,

Hossain²,

James³

et al. 2019

Semicond. Sci. Technol.

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“…In our experimental configuration, the CMgT crystal acts as an EO intensity modulator and measures the change in probe intensity that, subsequently, is recorded by the photodetector and read out by the lock-in as the voltage ΔV. Therefore, the differential transfer function of our EO sampling system is [27] ∆ sin (2) where V 0 is the dc component induced by our sampling beam with no excitation, and δ is given by Eq. (1).…”

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Photoconductive and electro-optic effects in (Cd,Mg)Te single crystals measured in an experiment-on-chip configuration

Serafini

Hossain

James

et al. 2017

Applied Physics Letters

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We present our studies on both photoconductive (PC) and electro-optic (EO) responses of (Cd,Mg)Te single crystals. In an In-doped Cd 0.92 Mg 0.08 Te single crystal, subpicosecond electrical pulses were optically generated via a PC effect, coupled into a transmission line, and, subsequently, detected using an internal EO sampling scheme. For both photo-excitation and EO sampling, we used femtosecond optical pulses generated by the same Ti:sapphire laser. The shortest transmission line distance between the optical excitation and EO sampling points was 75 µm. By measuring the transient waveforms at different distances from the excitation point, we calculated the transmission-line complex propagation factor and then reconstructed the electromagnetic transient generated directly at the excitation point, showing that the original PC transient was subpicosecond in duration with a fall time of ~500 fs. Finally, the measured EO retardation, together with the amount of the electric-field attenuation, allowed us to determine the magnitude of the internal EO effect in our (Cd,Mg)Te crystal. The obtained THz-frequency EO coefficient r 41 was equal to 0.4 pm/V, which is at the lower end among the different values reported for CdTe-based ternaries, possibly due to the twinned structure of the tested (Cd,Mg)Te crystal.

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Femtosecond electro-optic effect in (Cd,Mn)Te single crystals

Cited by 2 publications

References 10 publications

Time-resolved, nonequilibrium carrier and coherent acoustic phonon dynamics in (Cd, Mg)Te single crystals for radiation detectors

Time-resolved, nonequilibrium carrier and coherent acoustic phonon dynamics in (Cd, Mg)Te single crystals for radiation detectors

Photoconductive and electro-optic effects in (Cd,Mg)Te single crystals measured in an experiment-on-chip configuration

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