Novel SPR Sensor Based on MIM-based Waveguide and an Asymmetric Cross-shaped Resonator

• DOI: 10.1007/s11468-020-01348-8
• Publication Date: 2021-01-06T15:26:51Z
• Authors: Chang Su; Jun Zhu
• Keywords: Waveguide; Fano resonance

In recent years, sensing structures based on Fano resonances have become a hot research topic. In this study, a coupled structure, composed of a metal baffle metal-insulator-metal waveguide and an asymmetric cross-shaped resonator, is designed. By changing the coupling distance and asymmetry of the cross-shaped resonator, their influences on the transmission and electromagnetic field distribution were calculated and systematically analyzed. The results showed a good linear relationship between the center wavelength of the Fano transmission peak and the refractive index of the filled material. The sensor sensitivity can reach 795 nm/RIU. The prospective applications of this waveguide structure are promising. The structure can also provide a future reference for the design of a microwave waveguide structure.