A Review of Optical Waveguide Biosensor Especially in Diamond Waveguide

Nowadays optical waveguide biosensor has attracted much attention because it can solve the problems of detection equipment, such as low integration, large volume and low efficiency, in the field of food quality control. This article summarizes the existing problems in optical waveguide biosensors, and shows the solutions from two aspects: material selection and device configuration. Diamond is considered to be a new type of optical waveguide material instead of silicon, thanks to its excellent optical properties and corrosion resistance. In device configuration, the characteristics and advantages of several common waveguide structures are introduced, and some reasonable composite design are supposed to have a positive effect on improving the detection sensitivity of waveguide.