Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 12: Quantum Effects
Q 12.7: Talk
Monday, March 9, 2020, 15:30–15:45, f442
Nonlinear terahertz interferometry with visible photons — •Björn Haase1,2, Mirco Kutas1,2, Felix Riexinger1,2, Patricia Bickert1, Daniel Molter1, and Georg von Freymann1,2 — 1Fraunhofer Institute for Industrial Mathematics (ITWM), Fraunhofer-Platz 1, 67663 Kaiserslautern — 2Department of Physics and Research Center OPTIMAS, Technische Universität Kaiserslautern (TUK), 67663 Kaiserslautern
Nowadays, it is still technically challenging to detect terahertz radiation, although many different applications have been developed in the past. Based on the indistinguishability of correlated biphoton pairs, created by spontaneous parametric down-conversion (SPDC) due to vacuum fluctuations in a nonlinear crystal, Lemos et al. showed the possibility to transfer properties of photons in one spectral range into another range, for which better cameras exist [Lemos et al., Nature 512, 409-412, (2014)].
Recently, we demonstrated this concept in the strongly frequency non-degenerated regime with pairs of photons in the terahertz and visible spectral range [Kutas et al., arXiv:1909.06855, (2019)]. This concept enables us to determine sample properties in the terahertz frequency range using cameras that are sensitive only for visible light. Inspired by these studies, we present results of an alternative approach of this concept, by seeding the nonlinear interaction with phase-unlocked pulsed terahertz photons [Haase et al., 44th IRMMW-THz, Paris (2019)]. Because of an increased signal-to-noise ratio, this will facilitate us to reduce the required measurement time significantly.