Surface enhanced Raman spectroscopy (SERS) is a widely known sensing technique that
uses a plasmonic enhancement to probe analytes in ultra-small volumes. Recently, the
integration of plasmonic structures with photonic integrated waveguides promised the full
integration of a SERS system on a chip. Unfortunately, the previously reported sensors
provide modest overall SERS enhancement resulting in a limited signal to noise ratio. Here,
we report a photonic waveguide interfaced SERS sensor that shows an order of magnitude …