Broadband Achromatic Metasurface-Refractive Optics

Wei Ting Chen, Alexander Y. Zhu, Jared Sisler, Yao-Wei Huang, Kerolos M. A. Yousef, Eric Lee, Cheng-Wei Qiu, Federico Capasso*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

66 Scopus citations

Abstract

Existing methods of correcting for chromatic aberrations in optical systems are limited to two approaches: varying the material dispersion in refractive lenses or incorporating grating dispersion via diffractive optical elements. Recently, single-layer broadband achromatic meta surface lenses have been demonstrated but are limited to diameters on the order of 100 mu cm due to the large required group delays. Here, we circumvent this limitation and design a metacorrector by combining a tunable phase and artificial dispersion to correct spherical and chromatic aberrations in a large spherical plano-convex lens. The tunability results from a variation in light confinement in sub-wavelength waveguides by locally tailoring the effective refractive index. The effectiveness of this approach is further validated by designing a metacorrector, which greatly increases the of a state-of-the-art immersion objective (composed of 14 lenses and 7 types of glasses) from violet to near-infrared wavelengths. This concept of hybrid metasurface-refractive optics combines the advantages of both technologies in terms of size, scalability, complexity, and functionality.

Original languageEnglish
Pages (from-to)7801-7808
Number of pages8
JournalNano letters
Volume18
Issue number12
DOIs
StatePublished - 12 Dec 2018

Keywords

  • Metasurface
  • achromatic metalens
  • dispersion engineering
  • polarization-insensitive
  • visible spectrum
  • titanium dioxide
  • METAGRATINGS
  • GENERATION
  • HOLOGRAMS
  • METALENS
  • LIGHT

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