Orbital angular momentum divider of light

Manipulation of orbital angular momentum (OAM) of light is essential in OAM-based optical systems. Especially, OAM divider, which can convert the incoming OAM mode into one or several new smaller modes in proportion at different spatial paths, is very useful in OAM-based optical networks. However, t...

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Bibliographic Details
Published in:arXiv.org 2016-10
Main Authors: Hailong Zhou Jianji Dong, Li, Shimao, Cai, Xinlun, Yu, SiYuan, Zhang, Xinliang
Format: Article
Language:English
Subjects:
Angular momentum
Converters
Coordinate transformations
Data processing
Light
Light diffraction
Optical communication
Quantum phenomena
Online Access:Get full text
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Summary:Manipulation of orbital angular momentum (OAM) of light is essential in OAM-based optical systems. Especially, OAM divider, which can convert the incoming OAM mode into one or several new smaller modes in proportion at different spatial paths, is very useful in OAM-based optical networks. However, this useful tool was never reported yet. For the first time, we put forward a passive OAM divider based on coordinate transformation. The device consists of a Cartesian to log-polar coordinate converter and an inverse converter. The first converter converts the OAM light into a rectangular-shaped plane light with a transverse phase gradient. And the second converter converts the plane light into multiple diffracted light. The OAM of zeroth-order diffracted light is the product of the input OAM and the scaling parameter. The residual light is output from other diffracted orders. Furthermore, we extend the scheme to realize equal N-dividing of OAM and arbitrary dividing of OAM. The ability of dividing OAM shows huge potential for OAM-based classical and quantum information processing.
ISSN:2331-8422