Fig. 1. Single baffle MDM waveguide coupled disk cavity structure

Fig. 2. Fano resonance formation process. (a) Transmittance spectra when a single baffle or a disk is alone; (b) Fano resonance spectrum of single baffle MDM waveguide coupled disk cavity structure

Fig. 3. Ez field distributions. (a) Ez field distribution at λ=709 nm in the absence of baffle; (b) Ez field distribution at λ=1141 nm in the absence of baffle; (c) Ez field distribution at λ=721 nm after adding baffle; (d) Ez field distribution at λ=1162 nm after adding baffle; (e) Ez field distribution at λ=709 nm after adding baffle; (f) Ez field distribution at λ=1139 nm after adding baffle

Fig. 4. Effects of parameter R on resonance peak and FOM value. (a) Effect of parameter R on Fano resonance peaks; (b) effect of parameter R on FOM values at the first mode; (c) effect of parameter R on FOM values at the second mode

Fig. 5. Effects of parameter g on resonance peak and FOM values. (a) Effects of parameters g on Fano resonance peak; (b) effects of parameter g on FOM values

Fig. 6. FOM values at different wavelengths when parameters are optimal. (a) The first mode; (b) the second mode

Fig. 7. Relationship between environmental refractive index n and resonant wavelength λ. (a) Transmission spectra at different environmental refractive indices n; (b) linear relationship between environmental refractive index n and resonant wavelength λ