The application of the photonic crystal (PC) waveguide (WG) as the light delivery system in the heat-assisted magnetic recording (HAMR) system is demonstrated. The structure consists of a 90° bending PC waveguide and a ridge dielectric waveguide taper coupler. Three-dimensional (3D) models of structures are built and simulated in order to determine light coupling and transmission efficiencies. Geometric parameters including the taper length ( L TP ), coupler inlet width ( W FW ), and PC waveguide width ( W WG ) are investigated. The initial simulation shows that the transmission efficiency of over 90% can be achieved with the coupler integrated with the straight PC waveguide. However, the overall transmission efficiency is substantially reduced to 53.8% when the coupler is attached to the 90° bending PC waveguide. Our analysis shows that the wave mode matching and light decay rate in the waveguide cavity are significant contributing factors. The transmission efficiency increases to around 60.8% after some modification of the bending region.
Watcharakitchakorn, O., & Silapunt, R. (2018). Design and modeling of the photonic crystal waveguide structure for heat-Assisted magnetic recording. Advances in Materials Science and Engineering, 2018. https://doi.org/10.1155/2018/8097841