Electromagnetically induced angular Talbot effect

The discrete angular spectrum (angular Talbot effect) of a periodic grating illuminated by a suitable spherical wave front has been observed recently (Azaña and Chatellus 2104 Phys. Rev. Lett. 112 213902). In this paper we study the possibility of such a phenomenon being realized with a medium that...

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Bibliographic Details
Published in:Journal of physics. B, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2015-12, Vol.48 (24), p.245502-245508
Main Authors: Qiu, Tianhui, Yang, Guojian
Format: Article
Language:English
Subjects:
Amplitudes
angular Talbot effect
Atomic structure
Diffraction gratings
electromagnetically induced transparency
Gratings (spectra)
Illumination
Light (illumination)
Nonlinearity
Talbot effect
third-order nonlinear
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Summary:The discrete angular spectrum (angular Talbot effect) of a periodic grating illuminated by a suitable spherical wave front has been observed recently (Azaña and Chatellus 2104 Phys. Rev. Lett. 112 213902). In this paper we study the possibility of such a phenomenon being realized with a medium that has no macroperiodic structure itself. Tunable electromagnetically induced grating (EIG) could be such a kind of medium. We obtain an EIG based on the periodically modulated strong susceptibility due to the third-order nonlinear effect generated in a double Λ-type four-level atomic system, and show the angular Talbot effect of an amplitude EIG, as well as a hybrid EIG, as the condition of the discrete phase-modulation shift of the illumination light front is satisfied. EIG parameters are tunable and the EIG-based angular Talbot effect may have the same potential applications as its periodic grating counterpart has.
ISSN:0953-4075
1361-6455
DOI:10.1088/0953-4075/48/24/245502