Jul 17 – 22, 2022
Royal Conservatory of Music, Toronto
America/Toronto timezone

Creating and measuring sub-wavelength volumes using quantitative absorption imaging of optically dense ensembles

Jul 21, 2022, 5:00 PM
1h 30m
Hart House (Hart House)

Hart House

Hart House

7 Hart House Cir, Toronto, ON M5S 3H3
Poster presentation Quantum optics and hybrid quantum systems Poster session


Quantum gas microscopes have become a major element for quantum simulations using ultra-cold atoms in optical lattices. They are for example used to observe long-range order such as anti-ferromagnetic correlations in far field optical lattices using density and spin resolved microscopy. Decreasing the period of such lattice offer interesting perspective to increase atom-atom interaction energies and engineer atom-light coupling that our group tackles via the hybridization of cold atoms and nano-structured surfaces.
In this poster, we will present how such type of sub-wavelength lattice potentials can be generated by trapping atoms in proximity (tens to hundreds of nanometers) of a nano-structured surface. At such atom to surface distance, the attractive Casimir-Polder force can be compensated by a doubly dressed state trapping method that I will discuss. Such method additionally offers solutions to overcome the diffraction limit of conventional imaging that become critical for sub-wavelength lattices. In this work, I will present the experimental characterization of a sub-wavelength resolution absorption imaging applicable to quantum gas detection. This method requires a quantitative determination of the atom number of dense clouds which has been characterized in this work and demonstrate that the scattering cross section reduces linearly with the optical density. Modelling the propagation of light in dense cloud we show that this reduction can be attributed to re-scattering of the incoherent part of the resonant fluorescence spectrum.
The poster will additionally present an update on our recent work on the spectroscopy of Acetylene in sealed hollow core fibers.

Presenter name Bernon, Simon
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Primary authors

Dr Romain Veyron (Laboratoire de photonique numérique et nansciences) Jean-baptiste Gerent (LP2N - Université de Bordeaux - CNRS) Mr Guillaume Baclet (Laboratoire de photonique numérique et nanosciences) Dr Vincent Mancois (Laboratoire de photonique numérique et nanosciences) Dr Philippe Bouyer (Laboratoire de photonique numérique et nanosciences) Simon BERNON (University Bordeaux)

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