Multiresonant Nonlocal Metasurfaces

You Zhou, Shuwei Guo, Adam Christopher Overvig, Andrea Alù

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Optical metasurfaces supporting localized resonances have become a versatile platform for shaping the wavefront of light, but their low quality (Q-) factor modes inevitably modify the wavefront over extended momentum and frequency space, resulting in limited spectral and angular control. In contrast, periodic nonlocal metasurfaces have been providing great flexibility for both spectral and angular selectivity but with limited spatial control. Here, we introduce multiresonant nonlocal metasurfaces capable of shaping the spatial properties of light using several resonances with widely disparate Q-factors. In contrast to previous designs, the narrowband resonant transmission punctuates a broadband resonant reflection window enabled by a highly symmetric array, achieving simultaneous spectral filtering and wavefront shaping in the transmission mode. Through rationally designed perturbations, we realize nonlocal flat lenses suitable as compact band-pass imaging devices, ideally suited for microscopy. We further employ modified topology optimization to demonstrate high-quality-factor metagratings for extreme wavefront transformations with large efficiency.

Original languageEnglish
Pages (from-to)6768-6775
Number of pages8
JournalNano Letters
Volume23
Issue number14
DOIs
StatePublished - 26 Jul 2023

Keywords

  • High-Q nanophotonics
  • imaging
  • large-angle beam steering
  • meta-grating
  • nonlocal flat optics

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