Fig. (2): The RI sensor system.
Result and discussion
The experimental setup is displayed in Fig. 2. Firstly, the response of the fundamental SCS fiber configuration with 125 μm diameter of CLF (i.e. without etching) towards the in air determined which revealed a reasonably good extinction ratio, as shown in Fig. 3(A-C). Then, RI sensitivity of the assembled SCS configuration was investigated by immersing the sensor to various concentrations of NaCl solution corresponding to different RIs in range of 1.333-1.382 to investigate the surrounding RI response of SCS, while the temperature was preserved at the room temperature (25C).