Plasmon waveguide resonance sensor using an Au-MgF_2 structure

摘要

We report an Au - MgF_2 plasmon waveguide resonance (PWR) sensor in this work. The characteristics of this sensing structure are compared with a surface plasmon resonance (SPR) structure theoretically and experimentally. The transverse-magnetic-polarized PWR sensor has a refractive index resolution of 9.3 × 10~(-7) RIU, which is 6 times smaller than that of SPR at the incident light wavelength of 633 nm, and the transverse-electric-polarized PWR sensor has a refractive index resolution of 3.0 × 10~(-6) RIU. This high-resolution sensor is easy to build and is less sensitive to film coating deviations.