Abstract
A hybrid III-V/silicon laser design with a metal grating layer inserted in between is proposed and numerically studied. The metal grating layer is buried in a silicon ridge waveguide surrounded by silicon dioxide, and its structural parameters such as periodicity, width and depth can be varied for optimization purpose. The plasmonic effect originated from the grating layer can manage optical fields between III-V and silicon layers in hopes of dimension reduction. The substrate is planarized to minimize the bonding failure. A numerical algorithm with various combinations of metal grating and waveguide structural parameters was created and the optimal design with 730 nm grating period and 600 nm of buried waveguide ridge height was obtained by minimizing the corresponding laser threshold. With top AlInGaAs quantum wells and optimized design of hybrid metal/silicon waveguide, a 0.6 μm(-1) threshold gain can be achieved.
Highlights
The continuous growth of Internet-related business has boosted the demand of high speed data transmission and low circuit power consumption
When there is request to reduce the dimensions of the underneath silicon waveguide to hundreds of nano-meters, this hybrid platform is prone to fail because the physical size of the waveguide can no longer support an optical mode
This effect can be demonstrated by finite element method (FEM) which will be the backbone of our simulation study
Summary
The continuous growth of Internet-related business has boosted the demand of high speed data transmission and low circuit power consumption. Since its invention in 2006, the electrically-pumped hybrid III-V/silicon evanescent laser has become popular [8,9,10,11,12] In this design, a III-V gain chip is directly bonded onto a passive silicon waveguide (WG) to form the resonant cavity of the device. When there is request to reduce the dimensions of the underneath silicon waveguide to hundreds of nano-meters, this hybrid platform is prone to fail because the physical size of the waveguide can no longer support an optical mode. This effect can be demonstrated by finite element method (FEM) which will be the backbone of our simulation study. A numerical study of such design will be performed, and general device dimensions and performance will be evaluated through simulations
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