“…Thin AAAs can shift the resonant wavelength of EOT, create high electric fields in the nanodisk-nanohole gaps [ 8 , 9 , 10 ], improve the performance of EOT-based sensors [ 11 , 12 , 13 ], serve as substrates for surface-enhanced infrared absorption spectroscopy [ 14 ] and surface-enhanced Raman scattering [ 15 ], and even be utilized for constructing waveplates [ 16 ], etc. Additionally, nanorod-in-nanohole (NR-in-NH) structures have been extensively investigated both theoretically [ 17 , 18 , 19 ] and experimentally [ 20 , 21 ]. It has been observed that multiple parameters, such as hole diameter, rod length and aspect ratio, rod position, and the period of the nanohole array, can be simultaneously tuned to control the plasmonic properties, enabling multiple instances of coupling between SPPs and LSPs.…”