Amine functional groups Antibodies Antibody-antigen interactions Antigen-antibody binding Antigens Biosensors Body fluids Bovine serum albumins DNA DNA hybridization DNA molecules DNA sensing Deep reactive ion etching Detection sensitivity Experiments Fiberoptic probes Functional groups Grating structures Grating surface Human serum albumins Micro gratings Normal incidence Nucleic acids Oligonucleotide probes Oligonucleotides Probes Reactive ion etching Reflectance spectrum Reflected light Refractive index