Infiltrating a thin or single layer opal with an atomic vapour: sub-doppler signals and crystal optics

Abstract : Artificial thin glass opals can be infiltrated with a resonant alkali-metal vapour, providing novel types of hybrid systems. The reflection at the interface between the substrate and the opal yields a resonant signal, which exhibits sub-Doppler structures in linear spectroscopy for a range of oblique incidences. This result is suspected to originate in an effect of the three-dimensional confinement of the vapour in the opal interstices. It is here extended to a situation where the opal is limited to a few or even a single layer opal film, which is a kind of bidimensional grating. We have developed a flexible one-dimensional layered optical model, well suited for a Langmuir-Blodgett opal. Once extended to the case of a resonant infiltration, the model reproduces quick variations of the lineshape with incidence angle or polarization. Alternately, for an opal limited to a single layer of identical spheres, a three-dimensional numerical calculation was developed. It predicts crystalline anisotropy, which is demonstrated through diffraction on an empty opal made of a single-layer of polystyrene spheres.
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Submitted on : Wednesday, September 17, 2014 - 10:40:37 AM
Last modification on : Thursday, February 7, 2019 - 5:53:19 PM

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Elias Moufarej, Isabelle Maurin, Ilya Zabkov, Athanasios Laliotis, Philippe Ballin, et al.. Infiltrating a thin or single layer opal with an atomic vapour: sub-doppler signals and crystal optics. EPL - Europhysics Letters, European Physical Society/EDP Sciences/Società Italiana di Fisica/IOP Publishing, 2014, 108, pp.17008. ⟨10.1209/0295-5075/108/17008⟩. ⟨hal-01064748⟩

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