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We introduce multiresonant nonlocal metasurfaces that enable simultaneous spectral filtering and wavefront shaping. These novel optical metasurfaces offer enhanced control for applications like microscopy and advanced optical devices.

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Area of Science:

  • Optics and Photonics
  • Metasurfaces
  • Nanophotonics

Background:

  • Optical metasurfaces with localized resonances offer wavefront shaping but suffer from limited spectral and angular control due to low quality (Q)-factor modes.
  • Periodic nonlocal metasurfaces provide spectral and angular selectivity but lack fine spatial control.

Purpose of the Study:

  • To develop multiresonant nonlocal metasurfaces that combine spectral filtering and wavefront shaping capabilities.
  • To achieve simultaneous control over spectral, angular, and spatial properties of light.

Main Methods:

  • Design of multiresonant nonlocal metasurfaces utilizing multiple resonances with varying Q-factors.
  • Implementation of a highly symmetric array to achieve narrowband resonant transmission within a broadband resonant reflection window.
  • Application of topology optimization for fabricating high-Q-factor metagratings for extreme wavefront transformations.

Main Results:

  • Demonstration of simultaneous spectral filtering and wavefront shaping in the transmission mode.
  • Realization of nonlocal flat lenses as compact band-pass imaging devices for microscopy.
  • Achieved high-efficiency extreme wavefront transformations using topology-optimized metagratings.

Conclusions:

  • Multiresonant nonlocal metasurfaces offer enhanced control over light's spatial and spectral properties.
  • The developed flat lenses are suitable for compact, high-performance imaging systems in microscopy.
  • This work advances the design of metasurfaces for sophisticated optical applications requiring precise wavefront control.