modulating plasmonic sensor with graphene-based silicon grating

We propose a modulating plasmonic structure device which is composed of a single layer graphene above the silicon bragg grating with the silica spacer layer. this graphene-based plasmonic modulation provides a broad stop-band with high tunability in the mid-infrared region of the transmission spectra achieved by altering the geometrical parameters of the silicon grating and the gate voltage. by engineering, a phase discontinuity into the graphene-based bragg grating, we can selectively open a transmission window in the previous stop-band spectra. these proposed graphene-based structures are easy to fabricate and operate, which have potential applications as ultra-compact high-sensitivity sensors.