Kerr-Like Nonlinearity Induced via Terahertz Generation and the Electro-Optical Effect in Zinc Blende Crystals

Caumes, J-P.; Videau, L.; Rouyer, C.; Freysz, É.

doi:10.1103/physrevlett.89.047401

Cited by 52 publications

(42 citation statements)

References 10 publications

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“…So, our experiment suggests that it occurs through a change in the refractive index in the THz range. Since the THz pulse, during its generation, is partly overlapping temporally with the pump pulse, 14 this is also the athermalized photoinduced electrons that are mainly responsible for the spectral shift observed in Fig. 1.…”

Section: Impact Of Dispersion Free Carriers and Two-photon Absorptimentioning

confidence: 94%

Impact of dispersion, free carriers, and two-photon absorption on the generation of intense terahertz pulses in ZnTe crystals

Vidal

Degert

Tondusson

et al. 2011

Applied Physics Letters

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We study the evolution of the energy and the spectrum of a terahertz wave generated by optical rectification of an ultrashort laser pulse in ZnTe crystals with different thicknesses. As the pump intensity increases, we observe a shift in the terahertz spectrum toward lower frequencies. Moreover, at high pump intensities, in disagreement with common sense, thin crystals have a better conversion efficiency than thicker ones. These phenomena are accounted for by the pump depletion induced by two-photon absorption, pulse broadening and the impact of the photoinduced free carriers on the complex refractive index of the crystal in the terahertz range.

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Section: Impact Of Dispersion Free Carriers and Two-photon Absorptimentioning

confidence: 94%

Impact of dispersion, free carriers, and two-photon absorption on the generation of intense terahertz pulses in ZnTe crystals

Vidal

Degert

Tondusson

et al. 2011

Applied Physics Letters

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“…We use the ZnTe crystal which generates THz radiation. The calculation of the THz electric field from the crystal is described in reference [1] and the propagation of the THz radiation through the setup shown in Fig.1 is described in references [2], [3]. We have fitted the data obtained using this model and the following form of the Dielectric constant (Ω) of the non-linear crystal (ZnTe) given by,…”

Section: Modelmentioning

confidence: 99%

Study of excitation wavelength dependence of THz emission from ZnTe

Prabhu

Vengurlekar

2007

2007 International Workshop on Physics of Semiconductor Devices

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We present the study of Tera-Hertz (THz) radiation emitted by using ZnTe crystal as a function of excitation wavelengths varied from 760 nm to 840 nm. The THz experimental data is fitted theoretically by varying the ZnTe dielectric constant values within the prescribed limits. The theoretical model can be used to study the effect of shaped Infra-Red (IR) pulses incident on the ZnTe like crystals.Introduction The Tera-Hertz (THz) region of the electro-magnetic wave spectrum offers several new areas of applications. The generation, detection of the THz and its effect on various solid state materials, chemicals as well as biological materials has been the main course of investigation in the world. Attempts have been made in the past to model THz generation, propagation and detection. We present here the effect of excitation wavelength on the generation and detection crystals and using theoretical model, try to fit the observed data.The experimental setup and results are described in section I. The theoretical fit is briefly described in section II. Silicon BS WP 80−200fs 760−840nm 0.8−1.0W IR THz OAP Mirror Mirror BS Stage Delay ZnTe D2 D1 ZnTe QWP FIG. 1:The laser pulse tunable between 760-840nm, 80-200fs, 0.8-1 W, is split by beam splitter BS. The beam generates THz from ZnTe which is collected and focussed on ZnTe detector, passing through the Silicon Beam Splitter. The delay arm scans the optical pulse which is co-focussed with the THz beam on ZnTe detector and is detected in the standard ElecroOptic detection setup. I. RESULTS AND DISCUSSIONA 2 mm thick <110> ZnTe crystal is excited by a tunable Ti:Sapphire laser operating at 82 MHz, 100 fs pulse width with 0.8-1 Watt average power. The optical beam was focussed on the crystal and the generated THz is collected in the setup shown in Fig. 1. The THz is propagated as shown and is detected in the standard Electro-Optic (EO) setup. Fig. 2 shows the experimental THz electric field temporal data. The additional pulses seen are due to the finite crystal width of the generation and detection crystals. The curves are obtained for three different wavelengths, 780 nm, 800 nm and 840 nm. In Fig. 3 we show the Fourier transform of the obtained pulses at the above three different excitation wavelengths. From the figure it is clear that there is a substantial difference between the three spectra. For lower wavelengths the spectra are more peaked at the higher frequency end than at the lower frequency end. As the excitation wavelength is increased, the spectral peak moves towards the lower frequency and the temporal pulse shows closer to single cycle oscillation. II. MODELThe femtosecond pulse width limited generation of the THz radiation is possible by using non-linear optical phenomena of difference frequency generation. We use the ZnTe crystal which generates THz radiation. The calculation of the THz electric field from the crystal is described in reference [1] and the propagation of the THz radiation through the setup shown in Fig.1 is described in references [2], [3]. We ...

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“…Such terahertz pulses find wide applications ranging from imaging 1,2 to fundamental spectroscopy [3][4][5][6] and the study of terahertz generation techniques. [7][8][9][10][11][12][13][14] The process of optical rectification has been known since the birth of lasers and nonlinear optics. 15,16 One can make the distinction between resonant and non-resonant optical rectification in which either a real or virtual intermediate state is involved.…”

Section: Introductionmentioning

confidence: 99%

Terahertz-pulse emission through excitation of surface plasmons in metallic nanostructures

Welsh

Wynne

2008

SPIE Proceedings

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The second-order processes of optical rectification and photoconduction are well known and widely used to produce ultrafast electromagnetic pulses in the terahertz frequency domain. We present a new form of rectification relying on the excitation of surface plasmons (SPs) in metallic nanostructures. Multiphoton ionization and ponderomotive acceleration of electrons in the enhanced evanescent field of the SPs, results in a femtosecond current surge and emission of terahertz electromagnetic radiation. Using gold, this rectification process is third or higher order in the incident field.

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Kerr-Like Nonlinearity Induced via Terahertz Generation and the Electro-Optical Effect in Zinc Blende Crystals

Cited by 52 publications

References 10 publications

Impact of dispersion, free carriers, and two-photon absorption on the generation of intense terahertz pulses in ZnTe crystals

Impact of dispersion, free carriers, and two-photon absorption on the generation of intense terahertz pulses in ZnTe crystals

Study of excitation wavelength dependence of THz emission from ZnTe

Terahertz-pulse emission through excitation of surface plasmons in metallic nanostructures

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