Optical guidance and control in FINFET structure

Abstract

Silicon photonics is a promising platform which provides the highly scalable, low-cost on-chip photonic devices. Ideally, photonics miniaturization is limited due to the diffraction limit, which has been conveyed through the development of novel guiding of mechanisms. In a metal-dielectric interface, light can be coupled with collective oscillations of free electrons at nanoscales that exceed the limit of diffraction. Such waveguides with surface plasmon polariton (SPP) modes abide from excessive metal losses, so its practically they are limited. In a plasmonic waveguide for nanoscale devices, leaky mode confinement in a high refractive index layer beneath the Hybrid Plasmonic boundary layer can reduce further losses and control propagation Properties. Optical signals can be electrically controlled due to the large light-matter interaction. Recent advances in the field of Nano-photonics have become more capable of controlling the structure and properties of devices with high levels of precision. FinFET Structure is proposed as a nanophotonic platform to guide and control light. The hybrid plasmonic mode is made to guide in the dielectric layer around the silicon fin (channel). We are able to guide and control both TE and TM modes in the proposed structure which provides improved electrostatic control over the channel where the gate is wrapped around the Fin. The hybrid plasmonic mode is controlled through modulation of charge carriHUV¶ FRQGXFWLYLW\ LQ WKH channel by varying the gate voltage. By utilizing the gate and drain-source voltages we can control the charge carriers in the channel thereby realizing phase tuning. In addition, a voltage tunable absorption is also reported through the voltage variable imaginary part of the effective refractive index. The proposed device can be well suited for applications in photonic devices at real nanoscales. The proposed concept can pave the way to build other nano-scale functions like optical modulator, optical switch, optical filter, polarization converter etc. Photonic devices are quickly gaining traction as a way to fulfill bandwidth demands in communication networks and high-performance computing