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Angle-based wavefront sensing enabled by the near fields of flat optics.

Soongyu Yi1, Jin Xiang1, Ming Zhou1

  • 1Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, WI, USA.

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This study introduces a novel angle-based wavefront sensor using ultra-compact flat optics. This innovation significantly enhances spatial resolution, enabling advanced quantitative phase imaging and high-resolution surface topography measurements.

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Area of Science:

  • Optics and Photonics
  • Metrology and Measurement Science

Background:

  • Angle-based wavefront sensing, exemplified by Shack-Hartmann sensors, is widely adopted in industry and research due to its integrated setup, robustness, and speed.
  • A persistent limitation of traditional angle-based sensors is their low spatial resolution, primarily constrained by the physical size of the angle sensing element.

Purpose of the Study:

  • To develop an angle-based wavefront sensor that overcomes the spatial resolution limitations of existing methods.
  • To leverage flat optics and integration with focal plane arrays for enhanced wavefront sensing capabilities.

Main Methods:

  • Development of an ultra-compact angle sensor utilizing flat optics technology.
  • Direct integration of the novel angle sensor onto a focal plane array.
  • Characterization of the sensor's performance, focusing on spatial resolution and sampling density.

Main Results:

  • The new wavefront sensor maintains the advantages of angle-based methods, including robustness and speed.
  • Achieved an improvement in spatial sampling density exceeding two orders of magnitude compared to conventional sensors.
  • Demonstrated the potential for quantitative phase imaging with significantly enhanced resolution.

Conclusions:

  • The developed angle-based wavefront sensor offers a breakthrough in spatial resolution for wavefront measurement.
  • This advancement enables new applications in quantitative phase imaging, including real-time, high-resolution surface topography analysis.