Fig. 5From: Double Narrowband Induced Perfect Absorption Photonic Sensor Based on Graphene–Dielectric–Gold Hybrid MetamaterialAbsorption spectrum and the phase shift diagram when the refractive index nsur is increased from 1 to 1.1 by a step of 0.05. Here, the discussed structure is Fig. 1a and other parameters are nd = 2, nsur = 1Back to article page