Abstract
In this work, we discuss evanescent light coupling to silicon waveguides using surface plasmon polaritons (SPPs) in the Otto configuration. The setup for excitation of SPPs includes a fused-silica prism, a 100nm silver layer with a 650nm airgap between them, and a tapered silicon waveguide located across from the silver layer. A $p$p-polarized light of 1550nm wavelength is incident at plasmonic angle of 44° to the interface of the fused silica-airgap to excite the SPP.A 2D Lumerical FDTD Solutions simulation shows a coupling efficiency of 54%. The fabricated device on a silicon-on-insulator substrate shows 10% light transmission for $p$p-polarized light.
Published Version
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