Design of optical bio-sensor using polymeric waveguide

We present a detailed design of an optical bio-sensor using polymeric waveguides intended for blood glucose concentration measurements. Our proposed device is based on a vertical two-waveguide ARROW structure, simplifying fabrication and avoiding post tuning of sensor parameters. The theoretical analysis based on coupled mode theory and transfer matrix techniques is presented whereby ad device dimensions and parameters are calculated. For a 2cm sensor, output optical power in one guide can swing by approximately 17% depending on glucose concentration. Such results represent a significant improvement in performance when comparing with conventional Mach-Zehnder sensors.