Fig. 1. Preparation and characterization of GM. (a) Preparation process of GM; (b) 3D schematic of GM structure; (c) structural parameters of GM; (d) micrograph of GM; (e) Raman spectrum of three-layer graphene

Fig. 2. Transmission spectra. (a) Simulated transmission spectra of strip, semicircle, and entire structure; (b) transmission spectrum of experiment

Fig. 3. Electric field distribution in the XOY plane. (a) Strip; (b) semicircle; (c) entire structure

Fig. 4. Transmission spectrum of GM at different silk protein concentrations

Fig. 5. Schematic diagram of the Fermi energy level change of graphene at different silk protein concentrations

Fig. 6. Resonance parameters at different silk protein concentrations