Our Paper "Graphene-on-silicon hybrid plasmonic-photonic integrated circuits" is published online in Nanotechnology.

http://iopscience.iop.org/article/10.1088/1361-6528/aa7128

Graphene surface plasmons (GSPs) have shown great potential in biochemical sensing, thermal imaging, and optoelectronics. To excite GSPs, several methods based on the near-field optical microscope and graphene nanostructures have been developed in the past few years. However, these methods suffer from their bulky setups and low GSP-excitation efficiency due to the short interaction length between free-space vertical excitation light and the atomic layer of graphene. Here we present a CMOS- compatible design of graphene-on-silicon hybrid plasmonic-photonic integrated circuits that achieve the in-plane excitation of graphene surface plasmon polaritons as well as localized surface plasmon resonance. By employing a suspended membrane slot waveguide, our design is able to excite graphene surface plasmon polaritons on a chip. Moreover, by utilizing a graphene nanoribbon array, we engineer the transmission spectrum of the waveguide by excitation of localized surface plasmon resonance. Our theoretical and computational study paves a new avenue to enable, modulate, and monitor GSPs on a chip for on-chip biochemical sensors and electro-optic devices with high performance and efficiency.