Numerical design of surface magneto-plasmon sensors of Au/Co double-layer square arrayed nanopores on the continuous gold thin film

Surface magneto-plasmon (SMP) sensors have attracted continuous attention due to their field enhanced signal-to-noise ratios, sensitivities, and detection limits. Although many progresses been achieved in the nanodots, nanorods, or nanodiscs, few studies conducted on films containing arrays of nanopores nanoholes. SMP based could be much more promising for future ultrasensitive optical detectors since they can couple enhancement with Fabry–Pérot interference high-performance resonator that further tuned under a magnetic field. We, thus, propose sensor magneto-optical Kerr effect (MOKE) square array Au–Co double-layer Au film substrate SMP-MOKE sensor. The local electric around nanopore photonic crystals greatly by applying an external activity excitation high-quality surface plasmon resonances. Multi-physics coupling simulations validation COMSOL structure-dependent properties suggest proposed has high sensitivity 711 nm/Refractive Index Units (RIUs) figure merit (FOM) order 105 RIU−1, which is magnitude greater than best grating-type sensors, our knowledge. Our results shall facilitate theoretical design fabrication ultra-sensitive resonators excellent FOM reliability air-quality monitoring chemical sensing, etc.