Angle-Dispersive Metasurface for Axisymmetric Wavefront Manipulation over Continuous Incident Angles

Axisymmetric wavefront manipulation is desirable for retroreflection, collimation, beam steering, and other applications in optics, but is not easily implemented with typical metasurfaces, which have an almost fixed phase gradient for various angles of incidence. This study uses meta-atoms that are tilted out of the plane to build an $a\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}g\phantom{\rule{0}{0ex}}l\phantom{\rule{0}{0ex}}e\ensuremath{-}d\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}s\phantom{\rule{0}{0ex}}p\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}r\phantom{\rule{0}{0ex}}s\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}v\phantom{\rule{0}{0ex}}e$ metasurface with the required antisymmetric phase gradient plus antisymmetric angular phase dispersion, for axisymmetric wavefront manipulation. Its performance is demonstrated in both simulation and experiment.