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Physics  2011 

Photonic Band Gaps in One-Dimensionally Ordered Cold Atomic Vapors

DOI: 10.1103/PhysRevLett.106.223903

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We experimentally investigate the Bragg reflection of light at one-dimensionally ordered atomic structures by using cold atoms trapped in a laser standing wave. By a fine tuning of the periodicity, we reach the regime of multiple reflection due to the refractive index contrast between layers, yielding an unprecedented high reflectance efficiency of 80%. This result is explained by the occurrence of a photonic band gap in such systems, in accordance with previous predictions.


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