title: On-chip noninterference angular momentum multiplexing of broadband light.
abstract: Angular momentum division has emerged as a physically orthogonal multiplexing method in high-capacity optical information technologies. However, the typical bulky elements used for information retrieval from the overall diffracted field, based on the interference method, impose a fundamental limit toward realizing on-chip multiplexing. We demonstrate noninterference angular momentum multiplexing by using a mode-sorting nanoring aperture with a chip-scale footprint as small as 4.2 micrometers by 4.2 micrometers, where nanoring slits exhibit a distinctive outcoupling efficiency on tightly confined plasmonic modes. The nonresonant mode-sorting sensitivity and scalability of our approach enable on-chip parallel multiplexing over a bandwidth of 150 nanometers in the visible wavelength range. The results offer the possibility of ultrahigh-capacity and miniaturized nanophotonic devices harnessing angular momentum division.
authors.affiliation: Centre for Micro-Photonics and Centre for Ultrahigh Bandwidth Devices for Optical Systems (CUDOS), Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia.
authors.forename: Haoran
authors.initials: H
authors.lastname: Ren
authors.affiliation: Centre for Micro-Photonics and Centre for Ultrahigh Bandwidth Devices for Optical Systems (CUDOS), Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia. Institute of Photonics Technology, Jinan University, Guangzhou, China.
authors.forename: Xiangping
authors.initials: X
authors.lastname: Li
authors.affiliation: Centre for Micro-Photonics and Centre for Ultrahigh Bandwidth Devices for Optical Systems (CUDOS), Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia. Artificial Intelligence Nanophotonics Laboratory, School of Science, RMIT University, Melbourne, Victoria 3001, Australia.
authors.forename: Qiming
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: Centre for Micro-Photonics and Centre for Ultrahigh Bandwidth Devices for Optical Systems (CUDOS), Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia. Artificial Intelligence Nanophotonics Laboratory, School of Science, RMIT University, Melbourne, Victoria 3001, Australia. min.gu@rmit.edu.au.
authors.forename: Min
authors.initials: M
authors.lastname: Gu