Photonic properties of 1D-ordered cold atoms

Quantum Technology Centre seminar
William Guerin
Université Côte d’Azur, CNRS, Institut de Physique de Nice, France
Date and time
Online Video Conference

We study the photonic properties of a one-dimensional periodic macroscopic ensemble of cold atoms. A large number of atoms is trapped in a 1D optical lattice, thus forming layers of disordered atomic pancakes. This induces a periodic modulation of the refractive index, which can yield a large Bragg reflection [1]. In the past, adding four-wave mixing or EIT allowed us to obtain mirrorless optical parametric oscillation [2] and a two-port all-optical switch [3].

I will summarize these past results, which are all steady-state experiments. Now, we are studying temporal dynamical effects, in particular the optical transients in the Bragg reflection. I will show preliminary data on the existence of a small "flash" effect [4] in the Bragg reflection at the switch-off of the incident beam, and on the superradiant rate of the decay.

Finally, I will briefly discuss research prospects on this system: pulse propagation (slow light, quantum memory), spontaneous emission in the band gap, nonlinear effects, etc.

[1] A. Schilke, C. Zimmermann, P. W. Courteille, W. Guerin, Phys. Rev. Lett. 106, 223903 (2011).
[2] A. Schilke, C. Zimmermann, P. W. Courteille, W. Guerin, Nature Phot. 6, 101 (2012).
[3] A. Schilke, C. Zimmermann, W. Guerin, Phys. Rev. A 86, 023809 (2012).
[4] C. C. Kwong et al., Phys. Rev. Lett. 113, 223601 (2014).

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