SPR-POF Sensor Performance Comparison

An SPR fiber sensor has also been used to compare the performance of the new approach with a “classic” plasmonic approach [9 (link)]. Figure 3 shows the SPR-POF sensor with the experimental setup. The plasmonic platform was realized as described in [9 (link),26 (link)]. In this SPR sensor, the length of the sensing region is about 10 mm. The photoresist layer is 1500 nm thick and the gold film is 60 nm, presenting a good adhesion to the substrate too. In this configuration (SPR-POF sensor), we have used a more expensive “spectral interrogation” [9 (link),26 (link)]. Here, the experimental setup consists of a halogen lamp (HL-2000-LL, Ocean Optics, Dunedin, FL, USA) illuminating the sensor and a spectrum analyzer (USB2000+UV–VIS spectrometer, Ocean Optics, Dunedin, FL, USA) connected to a computer, as shown in Figure 3. The spectral emission of the lamp ranges from 360 nm to 1700 nm and the spectrometer is sensitive from 300 nm to 1050 nm.