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A linear taper is applied on a slab waveguide to control the divergence angle of the light. In this research, the slab waveguide design consists of silicon (Si) and SiO2 as the core and the substrate, respectively. The tapered design is optimized by measuring of Full-Width Half Maximum (FWHM) of the light after propagation in a Finite Different Time Domain (FDTD). The simulation results show that the optimized taper design is obtained when its length LT and width WL are 125 µm and 10 µm, respectively. This value is the optimal length to get the small diffraction angle of light during propagation in the waveguide. Thus, the divergence angle of the input light of the slab waveguide can be minimized by using this structure. One purpose of this research is to develop a miniaturized optical technology that is like the size of a chip.

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One of the techniques of wireless power transmission (WPT) which can be used to transmit power to long distances is optical WPT (OWPT). In this OWPT system, a camera with a color segmentation method and a color marker are used for target recognition. However, this method has disadvantages because it is very sensitive to the brightness of the environment and detection errors occur due to same-color objects in the visible spectrum. An infrared LED marker is put on the target and a bandpass filter lens is put on the camera to solve these problems in indoor applications. Due to the limitation on the detected size of single LEDs by the camera, the operational distance of this method is only 60-70 cm between target and camera. For outdoor applications, a blinking infrared LED marker is used. Using these methods, target recognition for indoor and outdoor applications of OWPT using infrared LED markers has been successfully demonstrated.

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