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Reflective metalens with sub-diffraction-limited and multifunctional focusing.

Hui Yang1,2, Guanhai Li3,4, Xiaofang Su1,2

  • 1National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yu Tian Road, Shanghai, 200083, China.

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|October 5, 2017
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We developed an ultra-thin metalens capable of sub-diffraction-limited focusing. This innovative reflective metalens achieves high efficiency and broadband focusing for advanced imaging applications.

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Area of Science:

  • Optics and Photonics
  • Nanotechnology

Background:

  • Metalenses offer miniaturization potential in optical systems.
  • Achieving sub-diffraction-limited focusing is crucial for super-resolution imaging.

Purpose of the Study:

  • To propose and demonstrate an ultra-thin planar reflective metalens.
  • To achieve sub-diffraction-limited and multifunctional focusing with high efficiency.

Main Methods:

  • Derivation of phase distributions based on the equal optical path principle.
  • Design and simulation of a planar reflective metalens structure.
  • Investigation of on-center, off-center, and dual-spot focusing capabilities.

Main Results:

  • Demonstrated sub-diffraction-limited focusing with 85% efficiency.
  • Achieved broadband focusing and multifunctional capabilities (on-center, off-center, dual-spot).
  • Evanescent-field enhancement mechanism confirmed for sub-diffraction-limited performance.

Conclusions:

  • The designed reflective metalens enables versatile sub-diffraction-limited focusing.
  • Potential applications include super-resolution imaging, advanced microscopes, and spectroscopic devices.