Zhang Zhaoyang, Shen Yutong, Ning Shaohuan, Liang Shun, Feng Yuan, Li Changbiao, Zhang Yanpeng, Xiao Min
Opt Lett. 2021 Sep 1;46(17):4096-4099. doi: 10.1364/OL.434164.
In this Letter, we have investigated experimentally the photonic realization of a moving lattice with an instantaneously tunable transverse velocity in a three-level -type warm atomic medium. The dynamic photonic lattice moving along the direction of its spatial periodicity was constructed by introducing a frequency difference (determining the velocity) between two coupling beams, whose interference pattern could optically induce a (spatial) periodic refractive index change inside the atomic vapor under electromagnetically induced transparency. When a Gaussian probe field is launched into this optically induced lattice, the output diffraction patterns can shift along the transverse direction, indicating dynamical features of induced photonic structures. The realization of this effectively controllable moving photonic lattice provides a new platform for guiding the transport of light.
在本信函中，我们通过实验研究了在三能级型热原子介质中具有瞬间可调横向速度的移动晶格的光子实现。通过在两束耦合光束之间引入频率差（决定速度），构建了沿其空间周期性方向移动的动态光子晶格，在电磁诱导透明条件下，其干涉图样能够在原子蒸汽内部光学诱导出（空间）周期性折射率变化。当将高斯探测场注入到这种光学诱导晶格中时，输出衍射图样会沿横向方向移动，这表明了诱导光子结构的动态特性。这种有效可控的移动光子晶格的实现为引导光的传输提供了一个新平台。
