Nonlinear four-wave-mixing control of photonic spin Hall beam shifts in semiconductor quantum wells

초록

We propose a method for the photonic spin Hall effect (PSHE) that exploits four-wave-mixing (FWM) to generate spin-orbit coupling of a weak probe in an electromagnetically induced transparency (EIT) medium using asymmetric semiconductor quantum wells (SQWs). A simple glass/SQW/glass trilayer system is used to imprint steep, low-loss dispersion and polarization anisotropy on the probe, converting its circular polarization (spin) into a tunable transverse displacement upon reflection. By optimizing the pump amplitude and optical detunings, the SQW film provides resonance-angle selectivity, reversible sign of the PSHE shift, and amplified spin splitting. We map operating windows that maximize spin-dependent beam deflection while maintaining high transparency. Our method provides a compact, CMOS-compatible technology platform for spin-photonic beam control, metrology, and polarization-programmable on-chip routing.

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