Chip-scale atomic spectrometer with silicon nitride optical phased array

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Januszewicz, J. and McWilliam, A. P. and Dyer, S. and McGilligan, J. P. and Griffin, P. F. and Riis, E. and Di Gaetano, E. and Sorel, M. and Paul, D. J. and Gallacher, K. (2025) Chip-scale atomic spectrometer with silicon nitride optical phased array. APL Photonics, 10 (7). 076104. ISSN 2378-0967 (https://doi.org/10.1063/5.0273108)

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Abstract

The integration of nanophotonic optical phased arrays (OPA) with alkali vapor cells has the potential to enhance the performance of chip-scale atomic systems by enabling novel methods for beam shaping and active alignment in atomic spectroscopy. In this work, we present the first demonstration of an OPA used for precision saturated absorption spectroscopy with a rubidium vapor cell integrated directly on the chip. The OPA, consisting of 64 emitters, expands a sub-micron waveguide mode into a >100 µm diameter free-space beam, optimized for the D 2 absorption line of rubidium. We resolved the sub-Doppler hyperfine splittings in both 85Rb and 87Rb isotopes, achieving Lorentzian linewidths ranging from 25 to 40 MHz suitable for stabilizing the cooling lasers in rubidium cold atom systems.

ORCID iDs

Januszewicz, J., McWilliam, A. P. ORCID logoORCID: https://orcid.org/0009-0002-9004-8368, Dyer, S. ORCID logoORCID: https://orcid.org/0000-0001-9419-4915, McGilligan, J. P. ORCID logoORCID: https://orcid.org/0000-0002-6514-9696, Griffin, P. F. ORCID logoORCID: https://orcid.org/0000-0002-0134-7554, Riis, E. ORCID logoORCID: https://orcid.org/0000-0002-3225-5302, Di Gaetano, E., Sorel, M., Paul, D. J. and Gallacher, K.;
  • Item type:Article
    ID code:93516
    Dates:
    Date
    Event
    7 July 2025
    Published
    21 June 2025
    Accepted
    Subjects:Science > Physics > Optics. Light
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:16 Jul 2025 08:28
    Last modified:19 Apr 2026 00:56
    URI:https://strathprints.strath.ac.uk/id/eprint/93516
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