2025/09/01 by Guoqiang Du, Zhifeng Liu, Na Liu +3 · 1 citation
Engineering · Physics and Astronomy · #Plasmonic and Surface Plasmon Research #Photonic and Optical Devices #Photonic Crystals and Applications
paper · doi:10.1088/1402-4896/ae0371
Abstract We propose a three-layer all-dielectric waveguide structure incorporating a subwavelength nanopore array in the top layer to enhance the transverse magneto-optical Kerr effect (TMOKE) in reflection mode. The design employs a periodic bismuth-substituted yttrium iron garnet nanoporous grating, which diffracts incident light and enables lateral leakage of guided mode resonance within the dielectric layer. This mechanism leads to a pronounced TMOKE response of up to 0.98, approaching the theoretical maximum of 1 and a high sensing figure of merit 626 RIU −1 . Numerical simulations confirm that the enhancement is robust across a wide range of surrounding refractive indices, indicating strong potential for sensing applications. The proposed structure offers a promising route toward low-loss, highly efficient integrated magneto-optical devices.