Thin high numerical aperture metalens

V. V. Kotlyar, A. G. Nalimov, S. S. Stafeev, Changyu Hu, L. O'Faolain, M. V. Kotlyar, D. Gibson, S. Song

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)
2 Downloads (Pure)


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
Number of pages10
JournalOptics Express
Issue number7
Publication statusPublished - 3 Apr 2017


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


Dive into the research topics of 'Thin high numerical aperture metalens'. Together they form a unique fingerprint.

Cite this