Mid-IR hyperspectral imaging with undetected photons
- URL: http://arxiv.org/abs/2507.07861v2
- Date: Fri, 11 Jul 2025 11:09:05 GMT
- Title: Mid-IR hyperspectral imaging with undetected photons
- Authors: Marlon Placke, Chiara Lindner, Felix Mann, Inna Kviatkovsky, Helen M. Chrzanowski, Hendrik Bartolomaeus, Frank Kühnemann, Sven Ramelow,
- Abstract summary: We build a proof-of-concept nonlinear interferometer in a wide-field imaging arrangement combined with high-resolution spectral acquisition by pixelwise quantum transform infrared spectroscopy.<n>For the broadband range of 2300-3100 cm$-1$, covering the important CH-stretch band, we perform hyperspectral imaging that simultaneously resolves 3500 spatial modes.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Sensing with undetected photons has become a vibrant, application-driven research domain with a special focus on the mid-infrared (mid-IR) wavelength region. Since the mid-IR contains spectral bands with highly specific and strong molecular absorbance signatures, often referred to as fingerprints, a multitude of different samples and their compositions can be detected and quantified spectroscopically. Enhancing this inherently sample alteration-free spectroscopic method with imaging capabilities leads to a powerful technique for environmental monitoring and biomedical applications that enables automated diagnostics while omitting time-consuming and non-reversible labeling steps. To evade the shortcomings of state-of-the-art instruments for mid-IR hyperspectral microscopy related to cost, complexity, power-consumption, and performance, which are associated with technological challenges for mid-IR cameras and low-noise and broadband mid-IR sources, here, we construct a proof-of-concept nonlinear interferometer in a wide-field imaging arrangement combined with high-resolution spectral acquisition by pixelwise quantum Fourier transform infrared spectroscopy. For the broadband range of 2300-3100 cm$^{-1}$, covering the important CH-stretch band, we perform hyperspectral imaging that simultaneously resolves 3500 spatial modes, each with a spectral resolution of 10 cm$^{-1}$ leveraging in total around 10$^5$ spatio-spectrally entangled photon modes. Our image acquisition uses a commercial, megapixel sCMOS camera, while a medium-power and compact c.w. pump laser is the only necessary light source.
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