Ultracompact Graphene-Assisted Tunable Waveguide Couplers with High Directivity and Mode Selectivity.

ABSTRACT: Graphene distinguishes itself as a promising candidate for realizing tunable integrated photonic devices with high flexibility. We propose a set of ultracompact tunable on-chip waveguide couplers with mode-selectivity and polarization sensitivity around the telecom wavelength of 1.55 μm, under the configuration of graphene-laminated silicon waveguides patterned with gold nanoantennas. Versatile couplings can be achieved in a widely tunable fashion within a deep-subwavelength area (210 × 210 nm²), by marrying the advantages of tight field confinement in plasmonic antennas and the largely tunable carrier density of graphene. Incident light signals can be selectively coupled into different fundamental modes with good mode quality and high directionality exceeding 25 dB. Design scen

SUBMITTER: Meng Y 

PROVIDER: S-EPMC6127104 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature