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

Jinkyeong Lee, Jaekyung Kim, Sangmin Shim, Younghwan Yang, Jeonghoon Choi, Junsuk Rho (), Dasol Lee () and Minkyung Kim ()
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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)
Dasol Lee: Yonsei University
Minkyung Kim: Gwangju Institute of Science and Technology (GIST)

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: 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.

Date: 2025
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DOI: 10.1038/s41467-025-56728-7

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