Abstract
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.
Highlights
Photonic crystals (PCs) are periodical optical micro- and nanostructures that receive increasing attention due to their ability to manipulate light propagation while maintaining high transmission efficiency. ey are typically designed based on their energy band gap to prohibit certain wavelengths. ey can be arranged in one dimension (1D) [1, 2], two dimensions (2D) [3,4,5], and three dimensions (3D) depending on guiding requirements. e 2D photonic crystal (PC) structure is the most popular choice for optical devices and has found various applications such as integrated circuits (ICs), wave filters or multiplexers, and waveguides [6,7,8,9,10,11,12,13]. e PC’s excellent transmission properties [14,15,16] and physical flexibility are attractive to minuscule WG fabrication
Several heat-assisted magnetic recording (HAMR) light delivery systems have been proposed, for example, the structure consisting of grating, slab waveguide, and near-field transducer (NFT) [24], the fiber optic connected with a spot-size converter (SSC) [25], and the butt-grating structure associated with multilayer core and cladding [26]. ese proposed light deliveries, suffer from power losses at different locations and produce less than 50% transmission efficiency
For WWG 1.0a√3 μm, there are 3 structures with LTP 5 μm that achieve over 90% coupling efficiency, that is, 94.6% for WFW 15 μm, 97.4% for WFW 25 μm, and 90.8% for WFW 30 μm. e 1.0a√3 μm width is chosen for integration with the 90° bending structure to form the proposed light delivery structure since it provides larger guiding area at the bending section
Summary
E application of the photonic crystal (PC) waveguide (WG) as the light delivery system in the heat-assisted magnetic recording (HAMR) system is demonstrated. E structure consists of a 90° bending PC waveguide and a ridge dielectric waveguide taper coupler. Ree-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. E initial simulation shows that the transmission efficiency of over 90% can be achieved with the coupler integrated with the straight PC waveguide. 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.
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