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Mid-infrared dual-comb polarimetry of anisotropic samples
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  • Karsten Hinrichs,
  • Brianna Blevins,
  • Andreas Furchner,
  • Nataraja Yadavalli,
  • Sergiy Minko,
  • Raphael Horvath,
  • Markus Mangold
Karsten Hinrichs
Leibniz-Institut für Analytische Wissenschaften – ISAS eV Department Berlin

Corresponding Author:[email protected]

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Brianna Blevins
University of Georgia
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Andreas Furchner
Helmholtz Zentrum Berlin
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Nataraja Yadavalli
University of Georgia
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Sergiy Minko
The University of Georgia
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Raphael Horvath
IRsweep AG
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Markus Mangold
IRsweep AG
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The mid-infrared (mid-IR) anisotropic optical response of a material probes vibrational fingerprints and absorption bands sensitive to order, structure and direction dependent stimuli. Such anisotropic properties play a fundamental role in catalysis, optoelectronic, photonic, polymer and biomedical research and applications. Infrared dual-comb polarimetry (IR-DCP) is introduced as a powerful new spectroscopic method for the analysis of complex dielectric functions and anisotropic samples in the mid-IR range. IR DCP enables novel hyperspectral and time-resolved applications far beyond the technical possibilities of classical Fourier-transform IR (FTIR) approaches. The method unravels structure–spectra relations at high spectral bandwidth (100 cm–1) and short integration times of 65 µs, with previously unattainable time resolutions for spectral IR polarimetric measurements for potential studies of noncyclic and irreversible processes. The polarimetric capabilities of IR-DCP are demonstrated by investigating an anisotropic inhomogeneous free-standing nanofiber scaffold for neural tissue applications. Polarization sensitive multi-angle dual-comb transmission amplitude and absolute phase measurements (separately for ss-, pp-, ps- and sp-polarized light) allow the in-depth probing of the samples’ orientation dependent vibrational absorption properties. Mid-IR anisotropies can be quickly identified by cross-polarized IR-DCP polarimetry.
14 Oct 2022Submitted to Natural Sciences
18 Oct 2022Submission Checks Completed
18 Oct 2022Assigned to Editor
19 Oct 2022Reviewer(s) Assigned
21 Dec 2022Review(s) Completed, Editorial Evaluation Pending
21 Dec 2022Editorial Decision: Revise Minor
13 Jan 20231st Revision Received
16 Jan 2023Submission Checks Completed
16 Jan 2023Assigned to Editor
16 Jan 2023Review(s) Completed, Editorial Evaluation Pending
17 Jan 2023Editorial Decision: Accept