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arXiv · 2408.13151

Direct observation of the enhanced photonic spin Hall effect in a subwavelength grating supporting surface plasmon resonance

N. I. Petrov·Y. M. Sokolov·V. V. Stoiakin·V. A. Danilov·V. V. Popov·B. A. Usievich
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Abstract

The photonic spin Hall effect (PSHE) in surface plasmon resonance (SPR) structures has great potential for various polarization-sensitive applications and devices. Here, using optical weak measurement, we observe spin-dependent and spin-independent angular shifts of the reflected beam, enhanced by SPR in a subwavelength nickel grating. An enhanced in-plane photonic spin Hall effect manifested in the angular splitting of circularly polarized photons with opposite helicity signs is demonstrated. We theoretically and experimentally demonstrate that angular in-plane shifts can be changed from spin-independent (Goos-H\"anchen shift) to spin-dependent (PSHE) when the incident beam polarization state changes. The SPR-induced depolarization of light and the mixing of polarization states are detected. High purity of spin separation and a high degree of circular polarization are achieved with an optimal polarization state (preselection angle) and a resonance angle of incidence. The spineless spatial separation of two orthogonal components of the field with diagonal linear polarizations is demonstrated.

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N. I. Petrov, Y. M. Sokolov, V. V. Stoiakin, V. A. Danilov, V. V. Popov, B. A. Usievich. 2024-08-23. Direct observation of the enhanced photonic spin Hall effect in a subwavelength grating supporting surface plasmon resonance. https://arxiv.org/abs/2408.13151

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