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International conference on fiber optics and photonics

Microwave controlled Electromagnetically Induced Transparency inside an RF cavity

K. Asha, Umesh Mohan, V Ranjith, M. Manukumara, T. M. Preethi, Anish D. Roshi, Andal Narayanan

Published Jan 1, 2012• 0 citations
Publisher

Abstract

We detail the construction of a microwave cavity resonator at 3.0357 GHz. We describe the effect of this resonator on the Electromagnetically Induced Transparency (EIT) phenomenon shown by 85Rb. atoms enclosed within the resonator.
DOI
10.1364/photonics.2012.t3a.3

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Cavity electromagnetically induced transparency (EIT) is created in a three-level atomic system confined in a cavity and coupled to a free-space control laser and is manifested as a narrow transmission peak of a probe laser coupled into the cavity mode and tuned to the two-photon Raman resonance with the control laser. Cavity EIT can be observed with a control laser detuned from the atomic transition frequency in a range limited by the vacuum Rabi splitting of two cavity-atom normal modes. This leads to the broadband cavity EIT obtained in the coupled-cavity-atom system with a free-space, broadband control laser. We report an experimental observation of broadband cavity EIT in cold Rb atoms with a frequency-modulated control laser and discuss its application in multichannel and multifrequency light memory.
We experimentally investigate a cavity in which two resonant meta-atoms are embedded. Its corresponding response spectrum to an incident microwave shows an electromagnetically-induced-transparency--like (EIT-like) phenomenon when the meta-atoms are arranged in the sequence node-antinode but not in the sequence antinode-node. We carry out in situ measurements of the cavity field to bring physical insight into this asymmetric response, and use the transfer matrix method joined with coupled-mode theory to give a quantitative analysis. Finally, we demonstrate the unidirectional EIT-like behavior in a two-port design. Our results may benefit novel nonreciprocal devices in the future by exploring the nonlinearity of the meta-atoms with this asymmetric arrangement.