title: Nonreciprocal optical diffraction by a single layer of gyromagnetic cylinders.
abstract: We study the diffraction of optical waves by a single layer of gyromagnetic cylinders. We show that a nonvanishing rotating dipole momentum is excited in a single gyromagnetic cylinder because of the classic analog of the Zeeman effect on photonic angular momentum states (PAMSs). Consequently, different collective dipole modes are excited in a gyromagnetic cylinder array at opposite incident angles. Nonreciprocal optical diffraction effects can be observed, where the transmission and reflection coefficients depend on the sign of the incident angle. A novel phenomenon of nonreciprocal negative directional transmission is demonstrated and numerically analyzed. This work highlights the potential of PAMSs in manipulating the propagation of optical waves for various applications.
authors: Tian-Jing
authors: TJ
authors: Guo
authors: Teng-Fei
authors: TF
authors: Li
authors: Mu
authors: M
authors: Yang
authors: Hai-Xu
authors: HX
authors: Cui
authors: Qing-Hua
authors: QH
authors: Guo
authors: Xue-Wei
authors: XW
authors: Cao
authors: Jing
authors: J
authors: Chen