Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 12: Quantum Effects
Q 12.6: Talk
Monday, March 9, 2020, 15:15–15:30, f442
Biphoton interference of terahertz and visible light — •Mirco Kutas1,2, Björn Haase1,2, Patricia Bickert1, Felix Riexinger1,2, 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
We present our latest developments in the detection of terahertz radiation using visible light [Kutas et al., arXiv:1909.06855, (2019)]. It bases on a quantum optical technique to detect radiation by transferring photon properties via biphoton correlation into another and better detectable spectral range [Lemos et al., Nature 512, 409-412 (2014)]. Only one photon of a correlated pair interacts with the sample, whereas solely its associated partner is detected, having never interacted with the sample. This concept is especially interesting for terahertz radiation, as detection in this frequency range is still technically complex. In our experiments the correlated photon pairs are created in a nonlinear crystal either due to spontaneous parametric down-conversion or conversion of thermal photons [Haase et al., Opt. Express 27, 7458-7468 (2019)]. Detecting the interference of the visible photons, we are able to perform layer thickness measurements with terahertz radiation.