Quantum-inspired terahertz spectroscopy with visible photons
- URL: http://arxiv.org/abs/2011.02759v1
- Date: Thu, 5 Nov 2020 11:11:47 GMT
- Title: Quantum-inspired terahertz spectroscopy with visible photons
- Authors: Mirco Kutas, Bj\"orn Haase, Jens Klier, Daniel Molter and Georg von
Freymann
- Abstract summary: Terahertz spectroscopy allows for identifying different isomers of materials, for drug discrimination and for detecting hazardous substances.
Despite these useful applications, terahertz spectroscopy suffers from the still technically demanding detection of terahertz radiation.
Here, we report on the first demonstration of terahertz spectroscopy, in which the sample interacts with terahertz idler photons.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Terahertz spectroscopy allows for identifying different isomers of materials,
for drug discrimination as well as for detecting hazardous substances. As many
dielectric materials used for packaging are transparent in the terahertz
spectral range, substances might even be identified if packaged. Despite these
useful applications, terahertz spectroscopy suffers from the still technically
demanding detection of terahertz radiation. Thus, either coherent
time-domain-spectroscopy schemes employing ultrafast pulsed lasers or
continuous-wave detection with photomixers requiring two laser systems are used
to circumvent the challenge to detect such low-energetic radiation without
using cooled detectors. Here, we report on the first demonstration of terahertz
spectroscopy, in which the sample interacts with terahertz idler photons, while
only correlated visible signal photons are detected - a concept inspired by
quantum optics. To generate these 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 separated from the signal radiation by
highly efficient and narrowband volume Bragg gratings. An uncooled scientific
CMOS camera detects the frequency-angular spectra of the remaining visible
signal and reveals terahertz-spectral information in the Stokes as well as the
anti-Stokes part of collinear forward generation. Neither cooled detectors nor
expensive pulsed lasers for coherent detection are required. We demonstrate
spectroscopy on the well-known absorption features in the terahertz spectral
range of $\alpha$-lactose monohydrate and para-aminobenzoic acid by detecting
only visible photons.
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