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This article is cited in 4 scientific papers (total in 4 papers)
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.
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
Linking options:
https://www.mathnet.ru/eng/co352 https://www.mathnet.ru/eng/co/v41/i1/p5
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