Broadband achromatic longitudinal bifocal metalens in the visible range based on a single nanofin unit cell.
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DOI: 10.1364/oe.450601
Abstract: Metasurfaces provide a remarkable platform to manipulate over phase, amplitude, and polarization flexibly and precisely. Bifocal metalens draws great research interest due to its ability of converging wavefronts to different focal positions horizontally and longitudinally.… read more here.
Keywords: broadband achromatic; achromatic longitudinal; bifocal metalens; based single ... See more keywords