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Advances in Materials Science and Engineering
Volume 2018, Article ID 8097841, 11 pages
Research Article

Design and Modeling of the Photonic Crystal Waveguide Structure for Heat-Assisted Magnetic Recording

Department of Electronic and Telecommunication Engineering, King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand

Correspondence should be addressed to Rardchawadee Silapunt;

Received 7 December 2017; Accepted 10 January 2018; Published 28 February 2018

Academic Editor: Andres Sotelo

Copyright © 2018 Orrathai Watcharakitchakorn and Rardchawadee Silapunt. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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 (LTP), coupler inlet width (WFW), and PC waveguide width (WWG) 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.