A thin high numerical aperture metalens

V.V Kotlyar, A.G. Nalimov, S.S. Stafeev, Changyu Hu, Liam O’Faolain, M. V. Kotlyar, Desmond Gibson, Shigeng Song

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19 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)8158 - 8167
JournalOptics Express
Volume25
Issue number7
DOIs
Publication statusPublished - 31 Mar 2017

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Keywords

  • Binary optics; Diffractive lenses; Subwavelength structures; Near-field microscopy; Microstructure fabrication; Polarization-selective devices

Cite this

Kotlyar, V. V., Nalimov, A. G., Stafeev, S. S., Hu, C., O’Faolain, L., Kotlyar, M. V., ... Song, S. (2017). A thin high numerical aperture metalens. Optics Express, 25(7), 8158 - 8167. https://doi.org/10.1364/OE.25.008158