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

被引：42

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

页码：2089 / 2092

页数：4

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