Journal
OPTICS EXPRESS
Volume 24, Issue 6, Pages 6656-6664Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.24.006656
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Funding
- National Natural Science Foundation of China (NSFC) [61575032]
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We propose a single layer all-dielectric metasurface lens to simultaneously convert and focus an incident linear polarization into a radial beam with high efficiency and high numerical aperture (NA). It shows a better focusing property compared with the linearly polarized metasurface lens for high NA. A tight spot size (0.502 lambda) is achieved for the NA = 0.94. Additionally, the emergent polarization can in principle be switched flexibly between radially and azimuthally polarized beams by the adjustment of incident polarization direction. It is expected that our scheme may have potential value in microscopy, material processing, medicine, particles accelerating and trapping, and so on. (C) 2016 Optical Society of America
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