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Spherical Aberration-Corrected Metalens for Polarization Multiplexed Imaging.

Shaodong Zhou1, Kelei Xi1, Songlin Zhuang1

  • 1Shanghai Key Laboratory of Modern Optical System, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China.

Nanomaterials (Basel, Switzerland)
|November 27, 2021
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Summary

We developed a new terahertz metalens for polarization multiplexed imaging. This aberration-corrected metalens offers enhanced imaging capabilities and multifunctional beam steering for advanced applications.

Keywords:
metalensmetasurfacespherical aberrationterahertz

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Area of Science:

  • Optics and Photonics
  • Terahertz Technology
  • Metamaterials

Background:

  • Metalenses offer miniaturization and novel optical functionalities.
  • Achieving polarization control and aberration correction simultaneously is challenging.
  • Terahertz imaging requires efficient and versatile optical components.

Purpose of the Study:

  • To design and demonstrate a terahertz spherical aberration-corrected metalens.
  • To achieve polarization multiplexed imaging using dynamic phase control.
  • To explore multifunctional applications including beam steering and chiroptical detection.

Main Methods:

  • Design of a spherical aberration-corrected metalens utilizing dynamic phase.
  • Characterization of polarization-dependent imaging efficiencies and extinction ratios.
  • Application of opposite gradient phases for longitudinal and transverse image shifting.

Main Results:

  • Demonstrated polarization-dependent imaging efficiencies exceeding 50%.
  • Achieved polarization extinction ratios greater than 10:1.
  • Observed a smaller depth-of-focus compared to traditional metalenses for point sources.

Conclusions:

  • The developed metalens enables efficient polarization multiplexed imaging in the terahertz domain.
  • The dynamic phase approach provides multifunctional beam steering capabilities.
  • This work offers a new platform for advanced terahertz imaging and sensing applications.