title: Generation and detection of broadband multi-channel orbital angular momentum by micrometer-scale meta-reflectarray.
abstract: We theoretically demonstrate the generation and detection of broadband multi-channel Orbital Angular Momentum(OAM) by a micrometer-scale meta-reflectarray. The meta-reflectarray composed of patterned silicon bars on a silver ground plane can be designed to realize phase modulation and work as chip-level OAM devices. Compared to traditional methods of OAM generation and detection, our approach shows superiorities of very compact structure size, broadband working wavelength (1250-1750 nm), high diffraction efficiency (~70%), simultaneously handling multiplex OAMs, and tunable reflection angle (0-45°). These fascinating advantages provides great potential applications in photonic integrated devices and systems for high-capacity and multi-channel OAM communication.
authors.forename: Jinpeng
authors.initials: J
authors.lastname: Liu
authors.forename: Changjun
authors.initials: C
authors.lastname: Min
authors.forename: Ting
authors.initials: T
authors.lastname: Lei
authors.forename: Luping
authors.initials: L
authors.lastname: Du
authors.forename: Yangsheng
authors.initials: Y
authors.lastname: Yuan
authors.forename: Shibiao
authors.initials: S
authors.lastname: Wei
authors.forename: Yiping
authors.initials: Y
authors.lastname: Wang
authors.forename: X-C
authors.initials: XC
authors.lastname: Yuan