Optical Review

, Volume 21, Issue 5, pp 568–575 | Cite as

Simulation on near-field light generated by metal nano-dot on GaAs substrate for heat source of heat-assisted magnetic recording

Special Section: The 23rd International Symposium on Optical Memory “ISOM’13, Korea” Regular Papers
First Online:
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Accepted:

Abstract

Heat-assisted magnetic recording (HAMR) is promising for achieving more than 1 Tb/inch2 recording density. A near-field transducer (NFT), which forms a hot spot of 10–100 nm in diameter on a recording medium, is necessary in HAMR. In this study, localized surface plasmons generated by a metal nano-dot in a novel device for a heat source of heat-assisted magnetic recording were analyzed using a simple model in which a metal hemisphere was formed on a GaAs substrate and a quasi-electrostatic approximation. The scattering and absorption efficiencies as well as the enhancement factor were investigated for several kinds of metal. As a result, their dependence on the wavelength and the polarization direction of the incident light was clarified.

Keywords

heat-assisted magnetic recording near-field transducer near-field light localized surface plasmon metal nano-dot quasi-electrostatic approximation 
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Copyright information

© The Optical Society of Japan 2014

Authors and Affiliations

  1. 1.Department of Information Electronics, Faculty of EngineeringFukuoka Institute of TechnologyFukuokaJapan

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