Open AccessTransfer of orbital angular momentum through sub-wavelength waveguides
Author(s) -
Yanqin Wang,
Xiaoliang Ma,
Mingbo Pu,
Xiong Li,
Cheng Huang,
Wenbo Pan,
Bo Zhao,
Jianhua Cui,
Xiangang Luo
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.002857
Subject(s) - angular momentum , optics , orbital angular momentum multiplexing , orbital angular momentum of light , physics , wavelength , waveguide , plasmon , angular momentum of light , total angular momentum quantum number , angular momentum coupling , quantum mechanics
Data capacity of optical communication is achieving its limit owing to the non-linear effect of optical fiber. As an effective alternative, light carrying orbital angular momentum can greatly increase the capacity for its unprecedented degree of freedom. We demonstrate the propagation of orbital angular momentum with topological charge of 1 and 2 in plasmonic circular waveguide with sub-wavelength diameter with little propagation loss of 2.73 dB/μm, which has never been observed in optical fibers with sub-wavelength diameter. We also confirm that lights carrying orbital angular momentum can be maintained in sharp bended sub-wavelength waveguide. This plasmonic waveguide may serve as a key component in on-chip systems involving OAM.