Journal
NATURE COMMUNICATIONS
Volume 11, Issue 1, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-020-17805-1
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Funding
- Vannevar Bush Faculty Fellowship - Basic Research Office of the Assistant Secretary of Defense (ASD) for Research and Engineering (RE)
- Office of Naval Research (ONR) [N00014-16-1-2813]
- Office of Naval Research through a MURI subaward from the University of Central Florida
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Novel forms of beam generation and propagation based on orbital angular momentum (OAM) have recently gained significant interest. In terms of changes in time, OAM can be manifest at a given distance in different forms, including: (1) a Gaussian-like beam dot that revolves around a central axis, and (2) a Laguerre-Gaussian (LGl,p) beam with a helical phasefront rotating around its own beam center. Here we explore the generation of dynamic spatiotemporal beams that combine these two forms of orbital-angular-momenta by coherently adding multiple frequency comb lines. Each line carries a superposition of multiple LGl,p modes such that each line is composed of a different l value and multiple p values. We simulate the generated beams and find that the following can be achieved: (a) mode purity up to 99%, and (b) control of the helical phasefront from 2-6 pi and the revolving speed from 0.2-0.6THz. This approach might be useful for generating spatiotemporal beams with even more sophisticated dynamic properties.
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