Title:	Demonstration of a high-contrast optical switching in an atomic Delta system.
Authors:	Ghosh, Megha Karigowda, Asha Jayaraman, Ayyappan Bretenaker, Fabien Sanders, Barry C Narayanan, Andal
Keywords:	Coherent atomic-field interactions effects electromagnetically induced transparency
Issue Date:	Aug-2017
Publisher:	IOP Publishing Ltd.
Citation:	Journal of Physics B Atomic Molecular and Optical Physics, 2017, Vol.50, p165502
Abstract:	We present an experimental study of a Δ system in a room temperature, dilute sample of 85Rb atoms. A Δ system in the D2 manifold of 85Rb is formed by connecting the two lower hyperfine energy levels of a Λ system by a microwave drive field at 3.0357 GHz. We show that when the Rabi frequency of a microwave drive field exceeds that of the optical probe field, a three-wave mixing nonlinear interaction is established. This nonlinear interaction changes the enhanced transmission of the optical probe to a deep absorption for a relative phase difference of π between all the three fields. We establish through our experiment and our numerical simulation, the phase-sensitive and nonlinear nature of the Δ system's response to the applied microwave and optical fields. Using this feature, we demonstrate a high-contrast microwave phase controlled switch for the optical probe field. In comparison with intensity and phase switching demonstrated with all-optical fields so far, our experiment opens up the possibility of obtaining the highest contrast optical switching with room temperature atoms.
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/6776
ISSN:	0953-4075 1361-6455 (Online)
Alternative Location:	http://dx.doi.org/10.1088/1361-6455/aa8014
Copyright:	2017 IOP Publishing Ltd.
Appears in Collections:	Research Papers (LAMP)

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