Figure 6: Comparative study of the sensors’ absorptivity, transmissivity, and reflectivity. +: Sensor 1: Silicon based substrate with 2 hours of pG-AuNPs incubation period, ○: Sensor 2: Silicon substrate with 4 hours of pG-AuNPs incubation period. ✩ : Sensor 3: Silicon/Silicon Dioxide substrate with 4 hours of pG-AuNPs incubation period. Results on Glutaraldehyde surface on cleaned Si substrate is also shown for comparison. (a): Transmission and reflection curves, (b) Absorption curves.