Multilayer coatings for Bloch surface wave optical biosensors
Sensors using surface plasmon resonance (SPR) are established as themethod of choice in label-free optical biosensing.
Their sensitivity for small refractive index changes at the surface originates from the enhanced evanescent
field at the surface of a thin metal layer. However, the small number of well-suited metals (Ag, Au) with
fixed optical constants limits a further refinement of the SPR performance in terms of dispersion and resonance
width. An alternative can be found in Bloch SurfaceWaves (BSW) sustained at specially designed dielectricmultilayer