Optical bio-sensors Refractive index 3 Biosensors 2 Silicon 2 Biomolecular recognition 1 Biosensing 1 Chloride ion (cl-) 1 Chloride ions 1 Chlorine compounds 1 Cl- ions 1 Coated glass substrates 1 Cystic fbrosis 1 Cystic fibrosis 1 Defect layers 1 Defect mode 1 Defective layers 1 Device sensitivity 1 Effective refractive index 1 Fluorescence quenching 1 Glass 1 Graphene 1 Graphene quantum dot 1 Hydrogels 1 Immobilisation 1 Interfaces (materials) 1 Ion chromatography 1 Ion detection 1 Ion exchange 1 Ions 1 Lab-on-chips 1