Optical sensors generally rely on abrupt phase changes to detect the presence of an analyte, but oftentimes they require complex nanostructures. Here, Sreekanth et al. use a simple asymmetric thin-film multilayer stack to demonstrate a point of darkness and phase singularity to develop a sensitive biosensor.
- Kandammathe Valiyaveedu Sreekanth
- Sivaramapanicker Sreejith
- Ranjan Singh
