Figure 2From: Tunable Fabry-Pérot interferometer based on nanoporous anodic alumina for optical biosensing purposesR specular spectrum of NAA samples. (a) R-OSC(1 to 4) (L p = 5 μm, and d p = 30, 41, 52, and 71 nm, respectively). (b) R-OSC(5 to 7) (d p = 30 nm, and L p = 5, 8.7, and 12.4 μm, respectively).Back to article page