Simulation on split-ring-resonator-type device for heat-assisted magnetic recording

Ryuichi Katayama; Satoshi Sugiura

doi:10.1117/12.2678075

4 October 2023 Simulation on split-ring-resonator-type device for heat-assisted magnetic recording

Ryuichi Katayama, Satoshi Sugiura

Proceedings Volume 12684, ODS 2023: Industrial Optical Devices and Systems; 1268406 (2023) https://doi.org/10.1117/12.2678075
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

Heat-assisted magnetic recording (HAMR) is a promising technology to increase the recording density of hard disk drives. A near-field transducer (NFT), which forms a small light spot on the recording medium, is necessary in HAMR. We previously proposed a device for HAMR, in which a metal nano-antenna as an NFT is attached to a semiconductor ring resonator as a light source. There are even and odd modes in this device. Because the near-field light is generated at the nano-antenna tip only in the even mode, how to excite the even mode selectively is an important issue. For this purpose, we introduced a split-ring-resonator-type device and investigated its effectiveness through a numerical simulation considering gain. When a narrow gap was placed at the nano-antenna bottom (Type 1) or at the opposite side to the nano-antenna bottom (Type 2) in the ring resonator, the gain for the even mode became higher than that for the odd mode. When the gap width increased, the gain difference became maximum at a certain width and then gradually decreased. The energy density at the nano-antenna tip for Type 1 was higher than that for Type 2. As the gap width increased, the energy density for Type 1 increased. Moreover, in Type 1, when the nano-antenna position was varied from outside to inside the ring resonator, the gain difference gradually decreased and the energy density increased. Therefore, the gap width and nano-antenna position should be designed considering the trade-off relationship between the gain difference and energy density.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Ryuichi Katayama and Satoshi Sugiura "Simulation on split-ring-resonator-type device for heat-assisted magnetic recording", Proc. SPIE 12684, ODS 2023: Industrial Optical Devices and Systems, 1268406 (4 October 2023); https://doi.org/10.1117/12.2678075

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