0605169 - ÚFE 2025 RIV US eng J - Journal Article
Salaj, J. - Vlk, M. - Zakoldaev, R. - Seton, R. - Čtyroký, Jiří - Alberti, S. - Aksnes, A. - Jágerská, J.
Suspended nanophotonic waveguide for isotope-specific CO2 detection.
Optica. Roč. 11, č. 12 (2024), s. 1654-1662. ISSN 2334-2536. E-ISSN 2334-2536
R&D Projects: GA MŠMT(CZ) EH22_008/0004573
Institutional support: RVO:67985882
Keywords : Optical waveguides * laser spectrometer * Nanophotonic waveguides
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 8.4, year: 2023 ; AIS: 3.522, rok: 2023
Method of publishing: Limited access
Result website:
https://opg.optica.org/optica/fulltext.cfm?uri=optica-11-12-1654&id=565266DOI: https://doi.org/10.1364/OPTICA.533710

The spectroscopic detection of gases and their stable isotopes holds significant value in bio-sciences and climate studies. However, achieving high precision has long been confined to bulky and costly equipment. In this work, we introduce a nanophotonic waveguide that is capable of detecting CO2 gas down to 20 parts per billion, and for the first time perform accurate stable isotope ratio measurements. The waveguide leverages a suspended membrane design with microstructured cladding, providing a high evanescent field confinement factor of 102%, moderate loss of 3.4 dB/cm, and effective suppression of etalons. The delta 13C isotope ratio precision of 0.2 parts per thousand was achieved, replicating the performance of high-end laser absorption spectrometers. This marks the inaugural instance of on-chip, isotope-specific gas detection with a compact and cost-efficient system scalable to sensor
Permanent Link: https://hdl.handle.net/11104/0364960