Simulation on temperature rise using ring-resonator-type device with optimized nano-antenna structure for heat-assisted magnetic recording

Heat-assisted magnetic recording (HAMR) is a promising technology for improving the recording density of hard disk drives. A near-field transducer (NFT), which forms a small light spot on a recording medium, is necessary in HAMR. We previously proposed a novel device, in which a metal nano-antenna as an NFT is attached to a semiconductor ring resonator as a light source. In this study, the temperature rise including the recording medium using this device was numerically simulated. It was found that the temperature rise of nano-antenna can be significantly reduced while heating the recording medium sufficiently by optimizing the nano-antenna structure.