Abstract
We show that it is possible to localize a three-level cascade atom under theresonance condition when it passes through a standing-wave field. Thelocalization peaks appear at the nodes of the standing-wave field, thedetecting probability is 50% in the subwavelength domain, and the peaksare narrower on the resonance than the off-resonance. The absorption isthe same as that in the usual two-level medium at the nodes and isgreatly suppressed outside the nodes due to the Autler–Townessplitting. This is in sharp contrast to the lambda scheme, in which thelocalization is impossible under the same resonance condition due to thedepletion of population of the initial state by the probe field at thenodes and the electromagnetically induced transparency outside thenodes.
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