Tyndall et al. demonstrate low-level detection of chemical agents using waveguide-enhanced Raman spectroscopy (WERS). By using the TM₀₀ mode of a thin silicon nitride waveguide, they decreased significantly the background light that normally prevents detection of chemical agents below a hundred ppb. They show that they can detect below 10 ppb and additionally work on the compatibility of their system with a low-cost commercial system. These improvements are very promising for the fabrication of small (on a chip!) and low-cost devices capable of detecting traces of chemicals in very small concentration. WERS also has the potential for the detection of biochemical agents or pollutants. The work presented here will surely contribute to the future application of WERS to sensing technology.

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