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Related Experiment Video

Updated: Jan 29, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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Monolayer Metasurface Enabling Linear Polarizer and Quarter-Wave Plate for Chip-Scale Atomic Clocks.

Taolong Wang1,2, Zhiqiang Li1, Ting Liang1

  • 1Key Laboratory of Micro/Nano Devices and Systems, Ministry of Education, North University of China, Taiyuan 030051, China.

Micromachines
|January 28, 2026
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Summary

A novel metasurface acts as a linear polarizer and quarter-wave plate, enhancing polarization control for chip-scale atomic clocks. This breakthrough improves frequency stability in compact timing systems.

Keywords:
atomic vapor cellschip-scale atomic clockmetasurface-based LP&QWP

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Area of Science:

  • Photonics and Metasurfaces
  • Atomic Frequency Standards
  • Miniaturized Electronics

Background:

  • Chip-scale atomic clocks (CSACs) require precise polarization control for optimal performance.
  • Traditional polarization components can be bulky, limiting miniaturization.
  • Metasurfaces offer a promising route for compact optical functions.

Purpose of the Study:

  • To design and demonstrate a monolayer metasurface functioning as a linear polarizer and quarter-wave plate (LP&QWP).
  • To integrate this metasurface into a chip-scale atomic clock prototype for enhanced polarization control and frequency stability.
  • To achieve simultaneous polarization control and optical power balancing within a single metasurface layer.

Main Methods:

  • Finite-difference time-domain (FDTD) simulations were used to design and optimize the metasurface.
  • Metasurface devices were fabricated on optical glass substrates.
  • Experimental characterization verified polarization manipulation (PER, DOP) and CSAC frequency stability.

Main Results:

  • The metasurface efficiently converted linearly polarized light to right-handed circularly polarized light.
  • Achieved a polarization extinction ratio (PER) of 4.8 dB and a degree of polarization (DOP) of 74.2%.
  • The CSAC prototype demonstrated short-term frequency stability of 9.29 × 10-11 at 1 s and 1.59 × 10-11 at 10,000 s.

Conclusions:

  • The developed metasurface provides effective polarization control for CSACs.
  • The single-layer metasurface enables simultaneous polarization control and optical power balancing.
  • This work establishes a viable approach for polarization control and frequency stability in miniaturized atomic clocks.