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Metalenses phase characterization by multi-distance phase retrieval.

Bowen Liu1, Jialuo Cheng2, Maoxiong Zhao3

  • 1State Key Laboratory of Surface Physics, Key Laboratory of Micro- and Nano-Photonic Structures (Ministry of Education) and Department of Physics, Fudan University, 200433, Shanghai, China.

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|August 6, 2024
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Summary

A new multi-distance phase retrieval system accurately characterizes metalens phase distribution. This method aids in optimizing metalens design and functionality by analyzing focal length and aberrations.

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Area of Science:

  • Optics
  • Materials Science

Background:

  • Metalenses offer unique functionalities and physical properties, driving significant research interest.
  • Optimizing metalens performance necessitates accurate characterization of their phase modulation.

Purpose of the Study:

  • To present a novel multi-distance phase retrieval system for metalens characterization.
  • To analyze the system's convergence, robustness, and capability in retrieving phase distribution.

Main Methods:

  • Optical field scanning was employed in a multi-distance phase retrieval system.
  • The system's performance was evaluated under varying measurement noise and scanned light field lengths.

Main Results:

  • The system successfully retrieves metalens phase distribution with low noise and sufficient scan length.
  • Focal length and aberration analysis are enabled by the computed phase distribution.
  • The system identified the impact of sample defects and variations in different working mediums (air, ethanol) on phase modulation.

Conclusions:

  • The developed system offers a straightforward method for metalens phase characterization.
  • This technique is crucial for optimizing metalens design and enhancing their functionality.
  • The study demonstrates the system's effectiveness in the near-infrared spectrum and with different mediums.