Thin high numerical aperture metalens
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We designed, fabricated, and characterized a thin metalens in an amorphous silicon film of diameter 30 µm, focal length equal to the incident wavelength 633 nm. The lens is capable of simultaneously manipulating the state of polarization and phase of incident light. The lens converts a linearly polarized beam into radially polarized light, producing a subwavelength focus. When illuminated with a linearly polarized Gaussian beam, the lens produces a focal spot whose size at full-width half-maximum intensity is 0.49λ and 0.55λ (λ is incident wavelength). The experimental results are in good agreement with the numerical simulation, with the simulated focal spot measuring 0.46λ and 0.52λ. This focal spot is less than all other focal spots obtained using metalenses.
Kotlyar , V V , Nalimov , A G , Stafeev , S S , Hu , C , O'Faolain , L , Kotlyar , M V , Gibson , D & Song , S 2017 , ' Thin high numerical aperture metalens ' Optics Express , vol 25 , no. 7 , pp. 8158-8167 . DOI: 10.1364/OE.25.008158
© 2017, Optical Society of America. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at www.osapublishing.org / https://doi.org/10.1364/OE.25.008158
DescriptionRF Ministry of Education and Science, RF President's grants for support of young candidates of science (MK-9019.2016.2) and leading scientific schools (NSh-9498.2016.9), and RFBR grants ## 15-07-01174, 15-37-20723, 15-47-02492, 16-29-11698, the European Research Council (ERC) under the European Union's Seventh Framework Programme (FP7/2007-2013) / ERC grant agreement n°337508, Federal Agency for Scientific Organizations.
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