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<p>Spin-dependent beam shifts provide a versatile route to manipulate the spin–orbit interaction of light. Here we propose a coherent tripod atomic medium incorporating Kerr nonlinearity as a platform for tunable photonic spin Hall shifts (PSHS). The tripod configuration introduces two independent Raman pathways that generate multi-window transparency and strongly modified dispersion. Analytical and numerical analysis show that these multiple coherence channels lead to split and enhanced PSHS peaks compared with conventional four-level N-type systems. The relative phase between the two coupling fields acts as a coherent control knob, allowing continuous modulation and complete inversion of the spin-dependent shift. Incorporating a Kerr-type nonlinear response produces an intensity-dependent detuning, giving rise to optical bistability and hysteresis in the PSHS behavior. This dual coherent–nonlinear mechanism enables reconfigurable and reversible control of the spin-dependent displacement of reflected light. The results suggest a route toward compact, tunable spin–orbit photonic devices for optical switching, beam routing, and precision sensing in atomic and hybrid photonic platforms.</p>

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Nonlinear coherent control of photonic spin hall shift in a tripod atomic system

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Md Aquib,
  • Meraj Ali Khan

摘要

Spin-dependent beam shifts provide a versatile route to manipulate the spin–orbit interaction of light. Here we propose a coherent tripod atomic medium incorporating Kerr nonlinearity as a platform for tunable photonic spin Hall shifts (PSHS). The tripod configuration introduces two independent Raman pathways that generate multi-window transparency and strongly modified dispersion. Analytical and numerical analysis show that these multiple coherence channels lead to split and enhanced PSHS peaks compared with conventional four-level N-type systems. The relative phase between the two coupling fields acts as a coherent control knob, allowing continuous modulation and complete inversion of the spin-dependent shift. Incorporating a Kerr-type nonlinear response produces an intensity-dependent detuning, giving rise to optical bistability and hysteresis in the PSHS behavior. This dual coherent–nonlinear mechanism enables reconfigurable and reversible control of the spin-dependent displacement of reflected light. The results suggest a route toward compact, tunable spin–orbit photonic devices for optical switching, beam routing, and precision sensing in atomic and hybrid photonic platforms.