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Photonic spin Hall effect can manipulate EM waves. One of the most representative manifestations of is spin-momentum locking. The spin changes only when the direction of EM wave propagation changes, offering many applications in photonic devices. Spin-momentum locking can be realized in spoof surface plasmon polariton (SSPP) waveguide. Spin-momentum locking demonstrates that photonic spin Hall effect (SHE) can manipulate electromagnetic (EM) waves, however, programmable EM wave manipulation is still challenging. In this work, the spin-momentum locking in programmable plasmonic metamaterial is demonstrated. Digital coding spoof surface plasmon polaritons (SSPPs) waves have two transverse spins. Moreover, photonic spin logic devices based on programmable plasmonic metamaterial are developed. By implanting spin degrees of freedom in digital coding SSPPs, both spin and coding can be used to control energy flow. Furthermore, SSPPs logic “AND” gate and “NIMPLY” gate (A AND NOT B) are designed and verified by simulation and experiment. The combination of digital coding technology with photonic SHE provides a more powerful and flexible platform for controlling EM waves.
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