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Cooperative lamb shift in an atomic vapor layer of nanometer thickness.

Keaveney, J. and Sargsyan, A. and Krohn, U. and Hughes, I. G. and Sarkisyan, D. and Adams, C. S. (2012) 'Cooperative lamb shift in an atomic vapor layer of nanometer thickness.', Physical review letters., 108 (17). p. 173601.


We present an experimental measurement of the cooperative Lamb shift and the Lorentz shift using a nanothickness atomic vapor layer with tunable thickness and atomic density. The cooperative Lamb shift arises due to the exchange of virtual photons between identical atoms. The interference between the forward and backward propagating virtual fields is confirmed by the thickness dependence of the shift, which has a spatial frequency equal to twice that of the optical field. The demonstration of cooperative interactions in an easily scalable system opens the door to a new domain for nonlinear optics.

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Publisher statement:© 2012 American Physical Society
Record Created:13 Jun 2012 11:50
Last Modified:13 Jun 2012 15:28

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