Lop-sided Raman-Nath diffraction in PT-antisymmetric atomic lattices

被引：40
作者：
Shui, Tao [1 ,2 ]
Yang, Wen-Xing [1 ,2 ]
Li, Ling [2 ]
Wang, Xin [2 ]
机构：
[1] Yangtze Univ, Sch Phys & Optoelect Engn, Jingzhou 434023, Hubei, Peoples R China
[2] Southeast Univ, Sch Phys, Nanjing 211189, Jiangsu, Peoples R China
来源：
OPTICS LETTERS | 2019年 / 44卷 / 08期
基金：
中国国家自然科学基金;
关键词：
SYMMETRY;
D O I：
10.1364/OL.44.002089
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
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
引用
收藏
页码：2089 / 2092
页数：4
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