Vertical field enhancement of a spot-size converter using a nanopixel waveguide and window structure.

Spot-size converter (SSC) is an essential building block for integrated photonic circuits applied as a mode transformer between optical components. One typical issue for SSC is the difficulty of broadening the vertical field profile. Herein, we propose a nanopixel SSC (1 × 2 μm) with changing hole size and density.

Tunable metamaterial-induced transparency with gate-controlled on-chip graphene metasurface.

We propose and numerically investigate a gate-controlled on-chip graphene metasurface consisting of a monolayer graphene sheet and silicon photonic crystal-like substrate, to achieve an electrically-tunable induced transparency. The operation mechanism of the induced transparency of the on-chip graphene metasurface is analyzed. The tunable optical properties with different gate-voltages and polarizations have been discussed.

All-optical controlling based on nonlinear graphene plasmonic waveguides.

We give the effective refractive index of graphene plasmonic waveguides with both linear and nonlinear effects based on the nonlinear cross-phase modulation, and address the effects of photo-induced refractive index change and absorption change. A non-resonant all-optical nonlinear graphene plasmonic switch with an ultra-compact size of 0.25 μm is proposed and numerically analyzed based on the dynamics of the photo-induced absorption change.

Reconfigurable and tunable flat graphene photonic crystal circuits.

Photonic crystal waveguides and circuits are one of the basic modules for integrated photonic devices. They mainly rely on photonic bandgaps to achieve light confinement and manipulation. Herein, we propose a novel general principle or method to achieve reconfigurable and tunable flat graphene photonic crystals (FG-PCs) by selectively electrostatic gating a layer of graphene with periodic gold electrodes.