Quantum 2025 – wissenschaftliches Programm
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FRI: Friday Contributed Sessions
FRI 8: Quantum Detectors in Optics and Particle Physics
FRI 8.4: Vortrag
Freitag, 12. September 2025, 11:30–11:45, ZHG009
Label-free mid-IR imaging with undetected photons — •Marlon Placke1, Chiara Lindner2, Felix Mann1, Inna Kviatkovsky1, Helen Chrzanowski1, Frank Kühnemann2, and Sven Ramelow1 — 1Institute for Physics, Humboldt-Universität zu Berlin, Germany — 2Fraunhofer Institute for Physical Measurement Techniques IPM, Freiburg, Germany
Sensing with undetected photons has become a distinct research field with numerous demonstrated applications, often dedicated to mid-infrared wavelength regions. Since these spectral bands entail molecule specific absorbance signatures also referred to as their fingerprints, sample compositions may be probed spectroscopically. To sidestep the challenges associated with camera sensors and low noise and broadband illumination sources for low-energy mid-infrared photons, we utilise a nonlinear interferometer in a widefield imaging arrangement with around 3500 resolved spatial modes and broadband signal and idler emission around 800 and 3800 nm, respectively. To importantly combine this with high-resolution spectral information, we employ Fourier transform infrared spectroscopy by scanning the interferometric delay and analysing the resulting interferogram for each illuminated camera pixel. Finally, we demonstrate the practicality of our novel hyperspectral technique for applications such as microplastics detection and bio-imaging tasks. Accordingly, this quantum imaging method holds good potential for applications relying on compact, cost-effective, and label-free analysis near the intrinsic performance limit of the probe light itself.
Keywords: Hyperspectral imaging; Nonlinear Interferometry; Label-free methods