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Physics Today

Opaque atoms turn transparent in the vacuum field of an optical cavity

R. Mark Wilson

Published Oct 31, 2011• 3 citations
Publisher

Abstract

A subtle quantum interference effect may offer a path to engineering all-optical logic gates and switches.
DOI
10.1063/pt.3.1318

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Abstract We explore the effect of a control field on the optical properties of a probe field in five-level inverted Y-type atom–light coupling schemes. While in the absence of the control field, it is discovered that the system is opaque for the probe field. When the control field is turned on, the medium switches to transparency for the probe field. In addition to analytical solutions, numerical results are given in terms of a Gaussian intensity profile of the probe field to elucidate such optical switching. Considering all orders of the probe field, we also study the absorption features of the atomic medium in a unidirectional ring cavity, giving rise to optical bistability. It is shown that in this model, the OB threshold can be controlled by both the control field intensity as well as probe field detuning.