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Nano Lett. 2019 Feb 13;19(2):1158-1165. doi: 10.1021/acs.nanolett.8b04571. Epub 2019 Jan 8.

Broadband Generation of Photonic Spin-Controlled Arbitrary Accelerating Light Beams in the Visible.

Fan Q1,2, Zhu W3,4, Liang Y1,2, Huo P1,2, Zhang C3,4, Agrawal A3,4, Huang K5, Luo X6, Lu Y1,2, Qiu C7, Lezec HJ3, Xu T1,2.

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National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures , Nanjing University , Nanjing 210093 , China.
Key Laboratory of Intelligent Optical Sensing and Manipulation , Ministry of Education , Nanjing 210093 , China.
Center for Nanoscale Science and Technology , National Institute of Standards and Technology , Gaithersburg , Maryland 20899 , United States.
Maryland NanoCenter , University of Maryland , College Park , Maryland 20742 , United States.
University of Science and Technology of China , Hefei 230026 , China.
Institute of Optics and Electronics , Chinese Academy of Sciences , Chengdu 610209 , China.
Department of Electrical and Computer Engineering , National University of Singapore , 117583 , Singapore.


Bending light along arbitrary curvatures is a captivating and popular notion, triggering unprecedented endeavors in achieving diffraction-free propagation along a curved path in free-space. Much effort has been devoted to achieving this goal in homogeneous space, which solely relies on the transverse acceleration of beam centroid exerted by a beam generator. Here, based on an all-dielectric metasurface, we experimentally report a synthetic strategy of encoding and multiplexing acceleration features on a freely propagating light beam, synergized with photonic spin states of light. Independent switching between two arbitrary visible accelerating light beams with distinct acceleration directions and caustic trajectories is achieved. This proof-of-concept recipe demonstrates the strength of the designed metasurface chip: subwavelength pixel size, independent control over light beam curvature, broadband operation in the visible, and ultrathin scalable planar architecture. Our results open up the possibility of creating ultracompact, high-pixel density, and flat-profile nanophotonic platforms for efficient generation and dynamical control of structured light beams.


Metasurface; accelerating light beams; nanostructures; visible wavelength

[Available on 2020-02-13]

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