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

Abstract

We propose and experimentally demonstrate capacitive actuation of a graphene-silicon micro-ring add/drop filter. The mechanism is based on a silicon-SiO 2 -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.

High-responsivity graphene photodetectors integrated on silicon microring resonators

“…high-speed (>200 GHz) 6 , 7 and broadband (ultraviolet to far-infrared) 8 , 9 operation that could lift bandwidth (BW) (~100 GHz) 10 , 11 and spectral (<1600 nm) 12 limitations of existing technologies, such as Ge/Si 13 , 14 and InGaAsP/InP 15 , 16 . A variety of waveguide (WG)-integrated SLG-based photonic devices have been reported 17 – 34 , including electro-absorption (EAMs) 17 – 19 and electro-refraction modulators (ERMs) 20 , optical switches 4 , 21 , and photodetectors (GPDs) 22 – 33 . SLG and layered materials can be integrated with passive Si photonic WGs 22 – 27 or any other passive WG technology 4 , including Si 3 N 4 29 , 34 , 35 , sapphire 36 , Ge 37 , and polymers 38 , 39 , extending the spectral range and scope of possible applications 37 , 40 .…”

Hybrid/Integrated Silicon Photonics Based on 2D Materials in Optical Communication Nanosystems

“…In 2017, Cassese et al studied the capacitive actuation and switching feature in a Si-SiO 2 -graphene integrated filter containing a ring WG. [222] From Figure 6a, one can see that the capacitive actuation of the add/drop functionality in this filter was acquired by applying different voltage to alter graphene optical absorption, without introducing the signal crosstalk that frequently occurs in a thermal engineering process. More importantly, the electroabsorption of graphene is tailored by changing the Fermi level via a capacitive element (SOG capacitor), which needs energy only during switching time, avoiding the continuous heating requirement in thermo-optic filters.…”

“…Reproduced with permission. [ 222 ] Copyright 2017, Chinese Laser Press. b) 3D schematic illustration of the polymer‐graphene‐Si WG‐based optical filter.…”

Field enhancement assisted graphene‐based microring modulator for high modulation depth

“…Theoretical and experimental attempts have been carried out to explore the potential applications of graphene embedded on ring resonator for applications in switches, delay lines and modulators [9]. In the recent past, modulator based on ring resonator utilising graphene‐oxide‐graphene (GOG) [10] and graphene‐oxide‐semiconductor (GOS)‐based capacitor structure have been experimentally demonstrated [11, 12]. The performance of ring resonator is mainly dependent on loss‐coefficient and self‐coupling coefficient.…”