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Metasurface Generation of Accelerating Light

The metasurface, consisting of plasmonic nanoantennas shown in the inset, was fabricated onto a glass substrate and illuminated by ultrafast laser pulses. The trajectory of the accelerating beam was imaged using a standard setup consisting of two lenses and a CCD.

Artificially designed planar devices known as metasurfaces can control the output of an incident beam to generate prechosen patterns. We designed and fabricated a metasurface that accelerates light along a partial circular trajectory and imaged the resulting beam. This compact, flat-optic approach allows for simple integration of accelerating light into photonic devices, thus opening new opportunities for the advanced manipulation of light.

 

Experimental (left) and theoretical (right) accelerating beams generated by our metasurface. The radius of curvature is 400 µm.

 Experimental (left) and theoretical (right) accelerating beams generated by our metasurface. The radius of curvature is 400 µm.