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Real-time observation of the spin Hall effect of light using metasurface-enabled single-shot weak measurements

Author

Listed:
  • Jinkyeong Lee

    (Gwangju Institute of Science and Technology (GIST))

  • Jaekyung Kim

    (Pohang University of Science and Technology (POSTECH))

  • Sangmin Shim

    (Yonsei University)

  • Younghwan Yang

    (Pohang University of Science and Technology (POSTECH))

  • Jeonghoon Choi

    (Gwangju Institute of Science and Technology (GIST))

  • Junsuk Rho

    (Pohang University of Science and Technology (POSTECH)
    Pohang University of Science and Technology (POSTECH)
    Pohang University of Science and Technology (POSTECH)
    POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics)

  • Dasol Lee

    (Yonsei University)

  • Minkyung Kim

    (Gwangju Institute of Science and Technology (GIST))

Abstract

The spin Hall effect of light (SHEL), the transverse splitting of light into two circularly polarized components via refraction or reflection, offers high-precision, nondestructive inspection of unknown interfaces when combined with a signal amplification technique called weak measurement. However, its application in detecting dynamics is limited due to its multistep process. Here, we condense the procedure into a single step, enabling calibration-free, single-shot measurement of the SHEL by replacing one component of the conventional setup with a polarization beamsplitting metasurface. Our approach allows for instantaneous evaluation of the SHEL, even with fluctuations in the original beam position. As proof of concept, we apply metasurface-assisted weak measurements to both static and dynamic scenarios, where the experimental results obtained from a single captured image demonstrate nice agreement with theory. This real-time observation of the SHEL highlights its potential for high-precision monitoring of dynamic processes such as biomedical sensing and chemical analysis.

Suggested Citation

  • Jinkyeong Lee & Jaekyung Kim & Sangmin Shim & Younghwan Yang & Jeonghoon Choi & Junsuk Rho & Dasol Lee & Minkyung Kim, 2025. "Real-time observation of the spin Hall effect of light using metasurface-enabled single-shot weak measurements," Nature Communications, Nature, vol. 16(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-56728-7
    DOI: 10.1038/s41467-025-56728-7
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