Multiple Fano resonances in metal–insulator–metal waveguide with umbrella resonator coupled with metal baffle for refractive index sensing
Qi Yun-Ping1, 3, †, Wang Li-Yuan1, Zhang Yu1, Zhang Ting1, Zhang Bao-He1, Deng Xiang-Yu1, Wang Xiang-Xian2
       

(a) Transmission spectra of the MIM structure with changing length of the horizontal resonator L2, (b) transmission spectra of two Fano resonance peaks FR4 and FR5 (wavelength range from 1250 nm to 1550 nm), and (c) resonance wavelengths of two Fano resonance peaks FR4 and FR5 changing with horizontal cavity length L2.