论文标题
一维光学晶格中的相控制的光学PT对称性和不对称的光衍射
Phase-controlled Optical PT symmetry and asymmetric light diffraction in one- and two-dimensional optical lattices
论文作者
论文摘要
我们提出了一种新的方案，用于将弱探头场的不对称光衍射到一维（1D）和二维（2D）晶格中，占据了冷原子。原子通过常驻波，两个耦合激光场和探针驱动到双Lambda型配置中。我们的研究表明，提出的方案能够形成不对称的衍射，这是由于在1D和2D晶格中诱导了光学平价对称性的结果。此外，可以证明，可以通过调整相对相的方式动态操纵衍射的不对称模式。此外，据表明，在一维晶格（光栅）的情况下，耦合场强度的变化对衍射分布不均匀分布的衍射阶强度有重大影响。
We propose a novel scheme for asymmetric light diffraction of a weak probe field into a one-dimensional (1D) and two-dimensional (2D) lattice occupied with cold atoms. The atoms are driven into the double lambda-type configuration by a standing wave, two coupling laser fields and a probe. Our study suggests the proposed scheme is capable of forming an asymmetric diffraction as a result of inducing optical parity-time symmetry in both 1D and 2D lattices. Moreover it is demonstrated that the asymmetric pattern of diffraction can be dynamically manipulated by means of adjusting the relative phase. Furthermore it is revealed that in the case of 1D lattice (grating), variation of the intensities of the coupling fields has a significant impact on the intensity of diffraction orders in the uneven distribution of diffraction.
