Phase-Insensitive Scattering of Terahertz Radiation

Petev, Mihail; Westerberg, Niclas; Rubino, Eleonora; Moss, Daniel; Couairon, Arnaud; Legare, Francois; Morandotti, Roberto; Faccio, Daniele; Clerici, Matteo

doi:10.3390/photonics4010007

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Phase-Insensitive Scattering of Terahertz Radiation

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Petev, Mihail
Sandoghdar Division, Max Planck Institute for the Science of Light, Max Planck Society;
Heriot Watt Univ, Sch Engn & Phys Sci, SUPA, Heriot Watt University, University of Edinburgh;

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Citation

Petev, M., Westerberg, N., Rubino, E., Moss, D., Couairon, A., Legare, F., et al. (2017). Phase-Insensitive Scattering of Terahertz Radiation. PHOTONICS, 4(1): 7. doi:10.3390/photonics4010007.

Cite as: https://hdl.handle.net/21.11116/0000-0000-7E42-9

Abstract

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.