Metallic slit aperture as a near-field optical head for heat-assisted magnetic recording

Satoshi Omodani, Toshiharu Saiki, Minoru Obara

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Heat assisted magnetic recording (HAMR) technique requires an optical head that can efficiently generate a subwavelength optical spot. The results of finite difference time domain simulation shows that two subwavelength rectangular holes adjacent to a metallic slit aperture make an optical spot from the slit smaller and its peak intensity higher. A subwavelength spot of 82×46 nm2 (full width at half maximum) in the recording medium is obtainable when a pair of rectangular holes is flanked adjacent to the slit aperture with a much smaller distance than the optical wavelength. This configuration provides a high transmittance of the slit aperture and a high expectation for a high controllability of both a thickness of the slit and a distance between the slit and the rectangular hole by the use of the planar process. By using a plasmon waveguide to guide light into the metallic slit aperture, a thin and efficient optical head for HAMR is achieved.

Original languageEnglish
Article number013101
JournalJournal of Applied Physics
Volume105
Issue number1
DOIs
Publication statusPublished - 2009

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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