Neosens

Poking around the Biobase today, I came across Neosens! The approach seem very similar to Instant NanoBioSensors, with gold nano-particles providing enhancement here combined with a nanohole¹ array:

From their 2019 Publication

Here instead of TIR, the nanoholes provide a localized optical field. The gold nanoparticles interfer with this to enable detection. All in all, it looks very similar to Instant NanoBio: