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A Fully Metaoptical Zoom Lens with a Wide Range.

Jianchao Zhang1,2, Qian Sun1, Zhengyang Wang1

  • 1State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China.

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|April 3, 2024
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This study introduces a novel zoom metalens using axial movement and a polynomial phase profile. This innovation achieves an 11.9x zoom range with high-quality imaging for compact optical systems.

Keywords:
varifocal imagingwide zoom rangezoom metalens

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Area of Science:

  • Optics and Photonics
  • Nanotechnology
  • Materials Science

Background:

  • Traditional metalenses have fixed focal lengths, limiting their use in dynamic applications.
  • Existing metalens zoom methods offer limited ranges or require supplementary optics for imaging.

Purpose of the Study:

  • To demonstrate a zoom metalens capable of both imaging and variable focusing through axial movement.
  • To overcome the limitations of fixed focal length and narrow zoom ranges in current metalens technology.

Main Methods:

  • Design of a metalens utilizing a polynomial phase profile to emulate an aspheric lens.
  • Implementation of axial movement for focal length adjustment and zoom functionality.
  • Characterization of imaging performance and zoom range through experimental validation.

Main Results:

  • Achieved a significant zoom range of 11.9x.
  • Maintained good imaging quality across the zoom range.
  • Demonstrated an extended depth of focus due to the polynomial phase profile.

Conclusions:

  • The developed zoom metalens offers a large, continuous zoom capability with high imaging fidelity.
  • This technology is suitable for miniaturized, weight-sensitive applications like drone and microrobot surveillance cameras.
  • The axial movement-based zoom metalens enables more versatile and flexible optical system designs.