JOURNAL ARTICLE

Broadband polarization-insensitive metalens with excellent achromaticity and high efficiency for the entire visible spectrum.

  • Published In: Applied Physics Letters, 2023, v. 122, n. 20. P. 1 1 of 3

  • Database: Academic Search Ultimate 2 of 3

  • Authored By: Zhu, Yechuan; Liu, Siyuan; Chang, Ying; Wang, Yingxia; Zhou, Shun; Wu, Chunfang; Liu, Weiguo 3 of 3

Abstract

The article focuses on the design and simulation of a polarization-independent achromatic metalens operating across the entire visible spectrum (400–760 nm) using a single layer of silicon nitride (Si3N4) nanopillars on a glass substrate. This metalens achieves an average focusing efficiency of 75.9% and a maximum focal shift of less than 0.3 wavelengths, significantly reducing chromatic aberration compared to previous metalenses. The design employs cross-shaped and square-ring Si3N4 unit cells that provide a linear relative phase response with frequency, enabling broadband achromatic focusing with a numerical aperture of 0.41. The study demonstrates improved focal-shift suppression, high efficiency, and polarization insensitivity, offering a promising approach adaptable to other spectral bands beyond the visible range.

Additional Information

  • Source:Applied Physics Letters. 2023/05, Vol. 122, Issue 20, p1
  • Document Type:Article
  • Subject Area:Science
  • Publication Date:2023
  • ISSN:0003-6951
  • DOI:10.1063/5.0152474
  • Accession Number:163823121
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