Fig. 8From: Characteristics of Plasmonic Bragg Reflectors with Graphene-Based Silicon Grating a 2D schematic illustration of PBR unit designed into a multi-step pattern: a three-step PBR unit and a six-step PBR unit, respectively. b Transmission spectra of PBR for three different cases. The red line represents the original PBR design (groove depth d = 120 nm); the green one and the blue one denote the three-step and six-step pattern cases, respectivelyBack to article page