Journal
NATIONAL SCIENCE REVIEW
Volume 9, Issue 7, Pages -Publisher
OXFORD UNIV PRESS
DOI: 10.1093/nsr/nwab149
Keywords
orbital angular momentum; spatiotemporal vortex; spatial vortex; spiral phase
Categories
Funding
- National Natural Science Foundation of China [92050202, 61805142, 61875245]
- Shanghai Science and Technology Committee [19060502500]
- Shanghai Natural Science Foundation [20ZR1437600]
- Wuhan Science and Technology Bureau [2020010601012169]
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The intersection of spatiotemporal and spatial vortices in photons enables three-dimensional orientation control with tilted orbital angular momentum (OAM).
Intersection of spatiotemporal and spatial vortices enables three-dimensional orientation control of photonic orbital angular momentum. Vortices are whirling disturbances, commonly found in nature, ranging from tremendously small scales in Bose-Einstein condensations to cosmologically colossal scales in spiral galaxies. An optical vortex, generally associated with a spiral phase, can carry orbital angular momentum (OAM). The optical OAM can either be in the longitudinal direction if the spiral phase twists in the spatial domain or in the transverse direction if the phase rotates in the spatiotemporal domain. In this article, we demonstrate the intersection of spatiotemporal vortices and spatial vortices in a wave packet. As a result of this intersection, the wave packet hosts a tilted OAM that provides an additional degree of freedom to the applications that harness the OAM of photons.
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