In this paper, a microdisk resonator (MDR) based on an - hybrid plasmonic waveguide (HPW) and its refractive index (RI) sensing characteristics are investigated. The plasmonic characteristics of the MDR based on the - HPW (APHPW-MDR) in near-infrared wavelengths are studied by using the finite element method. Through the structure parameter optimizations, the propagation length () of the APHPW-MDR is ∼165µ, which is ∼2.5 times as long as that of the MDR based on the AlN HPW (AHPW-MDR). The simulation results show that the quality factor () and extinction rate (ER) of the APHPW-MDR are ∼621.3 and ∼30, respectively. The RI sensing sensitivity () of the RI sensor based on the APHPW-MDR is ∼276.6/. The RI sensor based on the APHPW-MDR has wide application prospects in high-performance biochemical sensing, and it can also be used in integrated optical filters, modulators, switches, routers, and delay circuits.
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