title: Integrated optical vortex beam receivers.
abstract: A simple and ultra-compact integrated optical vortex beam receiver device is presented. The device is based on the coupling between the optical vortex modes and whispering gallery modes in a micro-ring resonator via embedded angular gratings, which provides the selective reception of optical vortex modes with definitive total angular momentum (summation of spin and orbital angular momentum) through the phase matching condition in the coupling process. Experimental characterization confirms the correct detection of the total angular momentum carried by the vortex beams incident on the device. In addition, photonic spin-controlled unidirectional excitation of whispering-gallery modes in the ring receiver is also observed, and utilized to differentiate between left- and right-circular polarizations and therefore unambiguously identify the orbital angular momentum of incident light. Such characteristics provide an effective mode-selective receiver for the eigen-modes in orbital angular momentum fiber transmission where the circularly polarized OAM modes can be used as data communications channels in multiplexed communications or as photonic states in quantum information applications.
authors.forename: Kenan
authors.initials: K
authors.lastname: Cicek
authors.forename: Ziyang
authors.initials: Z
authors.lastname: Hu
authors.forename: Jiangbo
authors.initials: J
authors.lastname: Zhu
authors.forename: Laura
authors.initials: L
authors.lastname: Meriggi
authors.forename: Shimao
authors.initials: S
authors.lastname: Li
authors.forename: Zhichao
authors.initials: Z
authors.lastname: Nong
authors.forename: Shengqian
authors.initials: S
authors.lastname: Gao
authors.forename: Ning
authors.initials: N
authors.lastname: Zhang
authors.forename: Xuyang
authors.initials: X
authors.lastname: Wang
authors.forename: Xinlun
authors.initials: X
authors.lastname: Cai
authors.forename: Marc
authors.initials: M
authors.lastname: Sorel
authors.forename: Siyuan
authors.initials: S
authors.lastname: Yu