Bonn 2025 – wissenschaftliches Programm
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 6: Poster
K 6.7: Poster
Dienstag, 11. März 2025, 14:00–16:00, Tent
Terahertz-Induced Nonlinear Response in ZnTe — •Felix Selz1, 2, 3, Johanna Kölbel2, Felix Paries1, Georg von Freymann1, 3, Daniel Molter1, and Daniel M. Mittleman2 — 1Fraunhofer Institute for Industrial Mathematics ITWM, Department Materials Characterization and Testing, 67663 Kaiserslautern, Germany — 2School of Engineering, Brown University, Providence, Rhode Island 02912, USA — 3Department of Physics and Research Center OPTIMAS, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany
Measuring terahertz waveforms in terahertz spectroscopy often relies on electro optic sampling employing a ZnTe crystal. Although the nonlinearities in such zincblende semiconductors induced by intense terahertz pulses have been studied at optical frequencies, the manifestation of nonlinearity in the terahertz regime has not been reported. In this work, we investigate the nonlinear response of ZnTe in the terahertz frequency region utilizing time-resolved terahertz-pump terahertz-probe spectroscopy. We find that the interaction of two co-propagating terahertz pulses in ZnTe leads to a nonlinear polarization change which modifies the electro-optic response of the medium. We present a model for this polarization that showcases the second-order nonlinear behavior. We also determine the magnitude of the third-order susceptibility in ZnTe at terahertz frequencies, χ(3)(ωTHz). These results clarify the interactions in ZnTe at terahertz frequencies, with implications for measurements of intense terahertz fields using electro-optic sampling.
Keywords: Nonlinear Optics; Terahertz Physics; Detection Utilizing ZnTe; Time Domain Spectroscopy; Electro-Optic Sampling