论文标题
环路电磁诱导的光栅的光学衍射不平衡衍射
Lopsided optical diffraction in loop electromagnetically induced grating
论文作者
论文摘要
我们在冷rubidium-87（$^{87} $ rb）原子合奏中提出了一个理论方案，并具有非富裕的光学结构，其中仅通过单个空间周期性调节和pare pare and Parity and pare and sountis and sountis sysis serm astric（$ \ altercal} $ {pt} $ {pt} $ {pt} $ {pt} compation diffaction raction rative of themitiatian Ontomic。 （$ \ MATHCAL {APT} $）可以通过调整应用梁的不同相对相位来切换调制。 $ \ MATHCAL {PT} $对称性和$ \ Mathcal {Pt} $反对称性在我们的系统中对耦合场的振幅都有牢固的稳定性，从而允许精确调制光学响应而无需对称折断。我们的方案显示了一些非平凡的光学特性，例如易变的衍射，单阶衍射，不对称的Dammam样衍射等。我们的工作将有益于多功能非热/非对称光学设备的开发。
We propose a theoretical scheme in a cold Rubidium-87 ($^{87}$Rb) atomic ensemble with a non-Hermitian optical structure, in which a lopsided optical diffraction grating can be realized just with the combination of single spatially periodic modulation and loop-phase.~Parity-time ($\mathcal{PT}$) symmetric and parity-time antisymmetric ($\mathcal{APT}$) modulation can be switched by adjusting different relative phases of the applied beams. Both $\mathcal{PT}$ symmetry and $\mathcal{PT}$ antisymmetry in our system are robust to the amplitudes of coupling fields, which allows optical response to be modulated precisely without symmetry breaking. Our scheme shows some nontrivial optical properties, such as lopsided diffraction, single-order diffraction, asymmetric Dammam-like diffraction, etc. Our work will benefit the development of versatile non-Hermitian/asymmetric optical devices.
