Probing molecules in gas cells of subwavelength thickness with high frequency resolution

Guadalupe Garcia Arellano, Joao Carlos Aquino Carvalho, Hippolyte Mouhanna, Esther Butery, Thierry Billeton, Frederic Du-Burck, Benoit Darquié, Isabelle Maurin and Athanasios Laliotis ()
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Guadalupe Garcia Arellano: Laboratoire de Physique des Lasers, Université Sorbonne Paris Nord
Joao Carlos Aquino Carvalho: Laboratoire de Physique des Lasers, Université Sorbonne Paris Nord
Hippolyte Mouhanna: Laboratoire de Physique des Lasers, Université Sorbonne Paris Nord
Esther Butery: Laboratoire de Physique des Lasers, Université Sorbonne Paris Nord
Thierry Billeton: Laboratoire de Physique des Lasers, Université Sorbonne Paris Nord
Frederic Du-Burck: Laboratoire de Physique des Lasers, Université Sorbonne Paris Nord
Benoit Darquié: Laboratoire de Physique des Lasers, Université Sorbonne Paris Nord
Isabelle Maurin: Laboratoire de Physique des Lasers, Université Sorbonne Paris Nord
Athanasios Laliotis: Laboratoire de Physique des Lasers, Université Sorbonne Paris Nord

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Miniaturizing and integrating atomic vapor cells is widely investigated for the purposes of fundamental measurements and technological applications such as quantum sensing. Extending such platforms to the realm of molecular physics is a fascinating prospect that paves the way for compact frequency metrology as well as for exploring light-matter interactions with complex quantum objects. Here, we perform molecular rovibrational spectroscopy in a thin-cell of micrometric thickness, comparable to excitation wavelengths. We operate the cell in two distinct regions of the electromagnetic spectrum, probing ν1 + ν3 resonances of acetylene at 1.530 µm, within the telecommunications wavelength range, as well as the ν3 and ν2 resonances of SF6 and NH3 respectively, in the mid-infrared fingerprint region around 10.55 µm. Thin-cell confinement allows linear sub-Doppler transmission spectroscopy due to the coherent Dicke narrowing effect, here demonstrated for molecular rovibrations. Our experiment can find applications extending to the fields of compact molecular frequency references, atmospheric physics or fundamental precision measurements.

Date: 2024
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DOI: 10.1038/s41467-024-45830-x

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