Journal
OPTICS EXPRESS
Volume 23, Issue 3, Pages 2857-2862Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.002857
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Funding
- 973 Program of China [2013CBA01700]
- National Natural Science Funds [61138002, 61405201, 61475160]
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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/mu m, 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.
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