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Computer Optics, 2017, Volume 41, Issue 1, Pages 5–12 (Mi co352)  

OPTO-IT

Thin metalens with high numerical aperture

V. V. Kotlyarab, A. G. Nalimovab, S. S. Stafeevba, L. O'Faolainc, M. V. Kotlyarb

a Image Processing Systems Institute of the RAS - Branch of the FSRC "Crystallography and Photonics" RAS, Samara, Russia
b Samara National Research University, Samara, Russia
c SUPA, School of Physics and Astronomy of the University of St. Andrews, Scotland

Abstract: We designed, numerically simulated, fabricated and characterized a thin metalens in an amorphous silicon film. The lens has a diameter of $30 \mu m$, a $633$-nm focal length equal to the incident wavelength, a $220$-nm period of the subwavelength features, and a $110$-nm relief depth. The lens simultaneously controls the phase and polarization of the incident laser light, transforming linear polarization into the radial one and generating a sharp focus. The metalens was fabricated using electron lithography and reactive ion etching. The focal spot obtained from an incident linearly polarized Gaussian beam of wavelength $\lambda$ measured $0.49\lambda$ and $0.55\lambda$ on the $x$- and $y$-axes. This is a record-breaking focal spot ever obtained using metalenses. Experimental results agree well with the numerically simulated focal spot size of $0.46\lambda$ and $0.52\lambda$.

Keywords: binary optics, meta surface, polarization, focus, near field microscopy

Funding Agency Grant Number
Ministry of Education and Science of the Russian Federation -9498.2016.9
Russian Foundation for Basic Research 14-29-07133__
15-07-01174-
15-37-20723-__
15-47-02492-__
16-29-11698-_
The work was partially funded by the Russian Federation Ministry of Education and Science, Presidential grants for support of leading scientific schools (NSh-9498.2016.9) and Russian Foundation of Basic Research Grants, (grants No. 14-29-07133, 15-07-01174, 15-37-20723, 15-47-02492, 16-29-11698).


DOI: https://doi.org/10.18287/2412-6179-2017-41-1-5-12

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Full text: http://www.computeroptics.smr.ru/.../410101.html
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Received: 30.12.2016
Accepted:31.01.2017

Citation: V. V. Kotlyar, A. G. Nalimov, S. S. Stafeev, L. O'Faolain, M. V. Kotlyar, “Thin metalens with high numerical aperture”, Computer Optics, 41:1 (2017), 5–12

Citation in format AMSBIB
\Bibitem{KotNalSta17}
\by V.~V.~Kotlyar, A.~G.~Nalimov, S.~S.~Stafeev, L.~O'Faolain, M.~V.~Kotlyar
\paper Thin metalens with high numerical aperture
\jour Computer Optics
\yr 2017
\vol 41
\issue 1
\pages 5--12
\mathnet{http://mi.mathnet.ru/co352}
\crossref{https://doi.org/10.18287/2412-6179-2017-41-1-5-12}


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