Recording head with focusing structure
AssigneeSeagate Technology LLC
InventorsRuoxi Yang, YongJun Zhao, Nan Zhou, Weibin Chen, Huaqing Yin, Michael Allen Seigler
Life of this patent
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Abstract
A recording head includes a near-field transducer proximate a media-facing surface of the recording head and a waveguide that overlaps and delivers light to the near-field transducer. The recording head includes subwavelength-sized focusing mirror comprising first and second reflectors disposed on cross track sides of the near-field transducer. Each of the first and second reflectors is spaced apart from the media-facing surface by a distance, D, measured along an axis normal to the media-facing surface.
Claims20
A recording head, comprising:
- a near-field transducer (NFT) comprising a peg, where the peg has a distal end positioned proximate a media-facing surface of the recording head;
- a waveguide that overlaps and delivers light to the near-field transducer;
- and
- a subwavelength-sized focusing mirror comprising first and second reflectors on cross track sides of the near-field transducer, wherein the first reflector has an NFT-facing side that varies in distance spaced apart from the NFT and the second reflector has an NFT-facing side that varies in distance spaced apart from the NFT corresponding to the varying distance of the first NFT-facing side and each of the first and second NFT-facing sides begin at a first position spaced apart from the distal end of the peg by a distance, D, measured along an axis normal to the media-facing surface, where the distal end of the peg is closer to the media-facing surface than the first position, and end at a second position spaced apart from the media-facing surface greater than D along the axis normal to the media-facing surface where each of the first and second reflectors has a distal side opposite and parallel to the media-facing surface and coupled to the NFT-facing side at the second position.
A recording head, comprising:
- a near-field transducer (NFT) comprising a peg, where the peg has a distal end positioned proximate a media-facing surface of the recording head;
- a waveguide that overlaps and delivers light to the near-field transducer;
- and
- a subwavelength focusing mirror comprising first and second reflectors on cross track sides of the near-field transducer, wherein the first reflector has an NFT-facing side that varies in distance spaced apart from the NFT and the second reflector has an NFT-facing side that varies in distance spaced apart from the NFT corresponding to the varying distance of the first NFT-facing side and each of the NFT-facing sides begin at a first position spaced apart from the distal end of the peg by a distance, D, as measured along an axis normal to the media-facing surface, where the distal end of the peg is closer to the media-facing surface than the first position, and end at a second position spaced apart from the media-facing surface greater than D along the axis normal to the media-facing surface, wherein D is about 5% to about 10% of a height of the near-field transducer as measured along the axis normal to the media-facing surface where each of the first and second reflectors has a distal side opposite and parallel to the media-facing surface and coupled to the NFT-facing side at the second position.
Dependencies are inferred from the claim text.