Before revision: Test Similar to other optical methods such as Surface Plasmon Resonance (SPR) or Bio-Layer Interferometry (BLI), it is based on measuring refractive index changes within an evanescent field near a sensor surface.
After revision: cite journal|vauthors = H. Jankovics, B. Kovacs, A. Saftics, T. Gerecsei, E. Toth, I. Szekacs, F. Vonderviszt, R. Horvath | title = Grating-coupled interferometry reveals binding kinetics and affinities of Ni ions to genetically engineered protein layers.| journal = Scientific Reports| date = December 2020| issue = 10| doi = 10.1038/s41598-020-79226-w| Similar to other optical methods such as Surface Plasmon Resonance (SPR) or Bio-Layer Interferometry (BLI), it is based on measuring refractive index changes within an evanescent field near a sensor surface.