Abstract
Investigation of refractive index (RI) and temperature response of unsaturated polyester resin (UPR)/polymethylmethacrylate (PMMA) based waveguides is presented. Three type waveguide structures were fabricated which are straight waveguide (sensor A), curved waveguide (sensor B) and half-filled core waveguide (sensor C). Simple fabrications were done by engraving PMMA sheets using CNC engraving machine to form grooves with cross section of 1×1 mm2. The grooves were then filled with UPR as core material. To investigate the RI response, the waveguides were immersed in glucose solution with various concentration values having RI of 1.33 to 1.3547. Meanwhile, for temperature response characterization, the sensors were placed in distilled water while heated using magnetic stirrer with temperature variation of 35°C-85°C with increment of 5°C. The results showed that the sensors showed good RI sensitivity and linearity with the highest sensitivity of -48.476 dB/RIU. It was also observed that the sensors were temperature dependent. The highest error due to temperature effect is -1.8×10−4 RIU/°C.
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