Capacitive actuation and switching of add-drop graphene-silicon micro-ring filters

We propose and experimentally demonstrate capacitive actuation of a graphene - silicon micro-ring add/drop filter. The mechanism is based on a silicon-SiO2-graphene capacitor on top of the ring waveguide. We show the capacitive actuation of the add/drop functionality by a voltage-driven change of the graphene optical absorption. The proposed capacitive solution overcomes the need for continuous heating to keep tuned the filter's in/out resonance and therefore eliminates in operation energy consumption. (C) 2017 Chinese Laser Press