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Waveguide-integrated plasmonics is a growing field with many innovativeconcepts and demonstrated devices in the visible and near-infrared. Here, weextend this body of work to the mid-infrared for the application ofsurface-enhanced infrared absorption (SEIRA), a spectroscopic method to probemolecular vibrations in small volumes and thin films. Built atop asilicon-on-insulator (SOI) waveguide platform, two key plasmonic structuresuseful for SEIRA are examined using computational modeling: gold nanorods andcoaxial nanoapertures. We find resonance dips of 80% in neardiffraction-limited areas due to arrays of our structures and up to 40% from asingle resonator. Each of the structures are evaluated using the simulatedSEIRA signal from poly(methyl methacrylate) and an octadecanethiolself-assembled monolayer. The platforms we present allow for a compact, on-chipSEIRA sensing system with highly efficient waveguide coupling in the mid-IR.

Waveguide-Integrated Mid-Infrared Plasmonics with High-Efficiency Coupling for Ultracompact Surface-Enhanced Infrared Absorption Spectroscopy