title: Broadband silicon optical modulator using a graphene-integrated hybrid plasmonic waveguide.
abstract: Graphene is an excellent electronic and photonic material for developing electronic-photonic integrated circuits in Si-based semiconductor devices with ultra wide operational bandwidth. As an extended application, here we propose a broadband silicon optical modulator using a graphene-integrated hybrid plasmonic waveguide, and investigate the optical characteristics numerically at a wavelength of 1.55 μm. The optical device is based on the surface plasmon polariton absorption of graphene. By electrically tuning the graphene's refractive index as low as that of a noble metal, the hybrid plasmonic waveguide supports a strongly confined highly lossy hybrid long-range surface plasmon polariton strip mode, and hence light coupled from an input waveguide experiences significant power attenuation as it propagates along the waveguide. Over the entire C-band from 1.530 to 1.565 μm wavelengths, the on/off extinction ratio is larger than 13.7 dB. This modulator has the potential to play a key role in realizing graphene-Si waveguide-based integrated photonic devices.
authors: Department of Electrical Engineering, KAIST, Daejeon 34141, Korea.
authors: Jin-Soo
authors: JS
authors: Shin
authors: Jin Tae
authors: JT
authors: Kim
mesh_terms: D004867:Equipment Design / Q000295:instrumentation; D006108:Graphite / Q000737:chemistry*; D008027:Light; D055096:Optical Devices; D012031:Refractometry / Q000295:instrumentation*; D012825:Silicon / Q000737:chemistry*; D020349:Surface Plasmon Resonance / Q000295:instrumentation
chemical_list: D006108:Graphite; D012825:Silicon