Wednesday, February 1, 2017

Abstract-Phase-Insensitive Scattering of Terahertz Radiation

School of Engineering and Physical Sciences, SUPA, Heriot-Watt University, Edinburgh EH14 4AS, UK
Max Planck Institute for the Science of Light (MPL), D-91058 Erlangen, Germany
Department of Physics and Solid State Institute, Technion, Haifa 32000, Israel
Centre de Physique Théorique CNRS, École Polytechnique, F-91128 Palaiseau, France
INRS-EMT, 1650 Blvd. Lionel-Boulet, Varennes, QC J3X 1S2, Canada
Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China
National Research University of Information Technologies, Mechanics and Optics, St. Petersburg 197101, Russia
School of Engineering, University of Glasgow, Glasgow G12 8LT, UK

The nonlinear interaction between Near-Infrared (NIR) and Terahertz pulses is principally investigated as a means for the detection of radiation in the hardly accessible THz spectral region. Most studies have targeted second-order nonlinear processes, given their higher efficiencies, and only a limited number have addressed third-order nonlinear interactions, mainly investigating four-wave mixing in air for broadband THz detection. We have studied the nonlinear interaction between THz and NIR pulses in solid-state media (specifically diamond), and we show how the former can be frequency-shifted up to UV frequencies by the scattering from the nonlinear polarisation induced by the latter. Such UV emission differs from the well-known electric field-induced second harmonic (EFISH) one, as it is generated via a phase-insensitive scattering, rather than a sum- or difference-frequency four-wave-mixing process

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