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30 August 2019 Three-dimensional simulation on near-field light generated by semiconductor ring resonator with metal nano-antenna for heat-assisted magnetic recording
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Abstract
Heat-assisted magnetic recording (HAMR) is a promising technology for achieving more than 10 Tbit/inch2 recording density. A near-field transducer (NFT), which forms a small light spot on a recording medium, is necessary in HAMR. However, the heat generated by the NFT would melt the NFT itself. To solve this problem, the authors have proposed a novel device, in which a metal nano-antenna is attached to a semiconductor ring resonator. In this paper, the near-field light generated by the semiconductor ring resonator with the metal nano-antenna was analyzed through a numerical simulation to optimize the structure of the device. The simulation was conducted using the finite element method based on a 3-dimensional model. It was found that how to excite a desired eigenmode selectively among some eigenmodes is important to make the device effective, and that various design parameters such as the length of the nano-antenna and the distance between the ring resonator and the nano-antenna can be optimized.
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Ryuichi Katayama and Satoshi Sugiura "Three-dimensional simulation on near-field light generated by semiconductor ring resonator with metal nano-antenna for heat-assisted magnetic recording", Proc. SPIE 11125, ODS 2019: Industrial Optical Devices and Systems, 1112506 (30 August 2019); https://doi.org/10.1117/12.2530827
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