Journal
OPTICS LETTERS
Volume 44, Issue 8, Pages 2089-2092Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.44.002089
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Funding
- National Natural Science Foundation of China (NSFC) [11374050, 11774054]
- Natural Science Foundation of Jiangsu Province [BK20161410]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX18_0055]
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Two-dimensional (2D) optical lattices of driven cold atoms can provide a useful platform to construct 2D electromagnetically induced grating (EIG) with parity-time (PT) anti-symmetry. This atomic grating is achieved by the spatial modulations of the atomic density and frequency detunings in the four-level double-Lambda atomic system. Gain-assisted PT antisymmetry allows us to realize lop-sided Raman-Nath diffraction with high diffraction efficiency at the exception point. It is shown that the nontrivial phenomenon originates from non-Hermitian degeneracy of PT antisymmetry. Our scheme may provide the possibility for active all-optical control and conversion of the spatial beam in optics. (C) 2019 Optical Society of America
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