A new methodology is proposed to implement laser beam steering with a wide angle of view and 4-5 orders of magnitude enhancement in scanning speed. It is based on light-matter interaction between metasurfaces and mode-locked lasers with a frequency-comb spectrum (i.e., equally-spaced phased-locked frequency lines). Replacing CW lasers with frequency-comb sources expands the impact of flat metasurfaces towards producing dynamic optical patterns rather than only static patterns in the far-field. A metasurface is judiciously designed to produce the optical pattern of a rotating light beam realizing ultrafast laser scanning with ~90-deg angle-of-view over ~100ps time interval.
Amr M. Shaltout, Konstantinos Lagoudakis, Soo Jin Kim, Jelena Vuckovic, Vladimir M. Shalaev, and Mark L. Brongersma, "Laser scanning using spatiotemporal beam dynamics in metasurfaces (Conference Presentation)," Proc. SPIE 10343, Metamaterials, Metadevices, and Metasystems 2017, 1034309 (Presented at SPIE Nanoscience + Engineering: August 06, 2017; Published: 25 September 2017); https://doi.org/10.1117/12.2273633.5588447312001.
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