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  4. Quantum-inspired terahertz spectroscopy with visible photons
 
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2021
Journal Article
Title

Quantum-inspired terahertz spectroscopy with visible photons

Abstract
Terahertz technology offers solutions in nondestructive testing and spectroscopy for many scientific and industrial applications. While direct detection of photons in this frequency range is difficult to achieve, quantum optics provides a highly attractive alternative: it enables the characterization of materials in hardly accessible spectral ranges by measuring easily detectable photons of a different spectral range. Here we report on the application of this principle to terahertz spectroscopy, measuring absorption features of chemicals at sub-terahertz frequencies by detecting visible photons. To generate the needed correlated signal-idler photon pairs, a periodically poled lithium niobate crystal and a 660 nm continuous-wave pump source are used. After propagating through a single-crystal nonlinear interferometer, the pump photons are filtered by narrowband volume Bragg gratings. An uncooled scientific CMOS camera detects the frequency-angular spectra of the remaining visible signal and reveals terahertz-spectral information. Neither cooled detectors nor expensive pulsed lasers for coherent detection are required.
Author(s)
Kutas, Mirco  
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM  
Haase, Björn
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM  
Klier, Jens  
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM  
Molter, Daniel  
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM  
Freymann, Georg von  
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM  
Journal
Optica  
Open Access
DOI
10.1364/OPTICA.415627
Language
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM  
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