Scanless quantum Fourier-transform mid-infrared spectroscopy for solids and surface analysis

Abstract

Quantum infrared (IR) spectroscopy is a novel technique based on nonlinear interferometry and quantum sensing with undetected photons. In this approach, spectrally far-separated correlated photon pairs are used for detection and probing, respectively. Hence, the probing wavelength domain (mid-IR) is substantially different from the detection spectral range (near-IR), which enables shot-noise-limited and cost-effective sensing schemes attractive for applied metrology. In this paper, we implement and employ a custom-built scanless quantum Fourier-transform mid-IR (sQFTIR) microspectrometer for chemical characterization and analysis of solids and interfaces. The sQFTIR system employs spectral-domain acquisition, without the need to scan the optical delay. This results in enhanced sensitivity and short measurement times and therefore enables rapid spectral acquisitions in 100~ms spanning a spectral band from 3000 cm⁻¹ - 2400 cm⁻¹. The capabilities of our approach are demonstrated for hyperspectral mid-IR imaging of dried pharmaceuticals (insulin on a gold surface) and investigation of a security feature on a banknote. Furthermore, we demonstrate hyperspectral imaging and spectroscopy through a turbid ceramic medium.

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BibTeX RIS

BibTeX

@misc{gattinger2026scanless,
  title = {{Scanless quantum Fourier-transform mid-infrared spectroscopy for solids and surface analysis}},
  author = {Paul Gattinger and Michela Conti and Franziska Dietz and Andrei N. Halangescu Moldovan and Andreas W. Schell and Markus Brandstetter and Ivan Zorin},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.37281},
  eprint = {2609.37281},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.37281},
}

RIS

TY  - UNPB
TI  - Scanless quantum Fourier-transform mid-infrared spectroscopy for solids and surface analysis
AU  - Paul Gattinger
AU  - Michela Conti
AU  - Franziska Dietz
AU  - Andrei N. Halangescu Moldovan
AU  - Andreas W. Schell
AU  - Markus Brandstetter
AU  - Ivan Zorin
PY  - 2026
DA  - 2026/09/29
PB  - arXiv
DO  - 10.48550/arxiv.2609.37281
UR  - https://arxiv.org/abs/2609.37281
AB  - Quantum infrared (IR) spectroscopy is a novel technique based on nonlinear interferometry and quantum sensing with undetected photons. In this approach, spectrally far-separated correlated photon pairs are used for detection and probing, respectively. Hence, the probing wavelength domain (mid-IR) is substantially different from the detection spectral range (near-IR), which enables shot-noise-limited and cost-effective sensing schemes attractive for applied metrology. In this paper, we implement and employ a custom-built scanless quantum Fourier-transform mid-IR (sQFTIR) microspectrometer for chemical characterization and analysis of solids and interfaces. The sQFTIR system employs spectral-domain acquisition, without the need to scan the optical delay. This results in enhanced sensitivity and short measurement times and therefore enables rapid spectral acquisitions in 100~ms spanning a spectral band from 3000 cm^−1 - 2400 cm^−1. The capabilities of our approach are demonstrated for hyperspectral mid-IR imaging of dried pharmaceuticals (insulin on a gold surface) and investigation of a security feature on a banknote. Furthermore, we demonstrate hyperspectral imaging and spectroscopy through a turbid ceramic medium.
ER  -

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