Compressed Sensing of Field-Resolved Molecular Fingerprints Beyond the Nyquist Frequency

Scheffter K, Will J, Riek C, Jousselin H, Coudreau S, Forget N, Fattahi H (2024)

Publication Type: Journal article

Publication year: 2024

Journal

Ultrafast Science American Association for the Advancement of Science

Book Volume: 4

Article Number: e0062

DOI: 10.34133/ultrafastscience.0062

Abstract

Ultrashort time-domain spectroscopy and field-resolved spectroscopy of molecular fingerprints are gold standards for detecting samples' constituents and internal dynamics. However, they are hindered by the Nyquist criterion, leading to prolonged data acquisition, processing times, and sizable data volumes. In this work, we present the first experimental demonstration of compressed sensing on field-resolved molecular fingerprinting by employing random scanning. Our measurements enable pinpointing the primary absorption peaks of atmospheric water vapor in response to terahertz light transients while sampling beyond the Nyquist limit. By drastically undersampling the electric field of the molecular response at a Nyquist frequency of 0.8 THz, we could successfully identify water absorption peaks up to 2.5 THz with a mean squared error of 12 × 10-4. To our knowledge, this is the first experimental demonstration of timedomain compressed sensing, paving the path toward real-time field-resolved fingerprinting and acceleration of advanced spectroscopic techniques.

Authors with CRIS profile

Kilian Scheffter Lehrstuhl für Experimentalphysik (Alfried Krupp von Bohlen und Halbach-Professur)

Involved external institutions

Fastlite FR France (FR) Max-Planck-Institut für die Physik des Lichts (MPL) / Max Planck Institute for the Science of Light DE Germany (DE) LMU Klinikum DE Germany (DE)

How to cite

APA:

Scheffter, K., Will, J., Riek, C., Jousselin, H., Coudreau, S., Forget, N., & Fattahi, H. (2024). Compressed Sensing of Field-Resolved Molecular Fingerprints Beyond the Nyquist Frequency. Ultrafast Science, 4. https://doi.org/10.34133/ultrafastscience.0062

MLA:

Scheffter, Kilian, et al. "Compressed Sensing of Field-Resolved Molecular Fingerprints Beyond the Nyquist Frequency." Ultrafast Science 4 (2024).

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