公开(公告)号：US10127938B2

公开(公告)日：2018-11-13

申请号：US15784429

申请日：2017-10-16

Applicant: Seagate Technology LLC

Inventor： Aidan Dominic Goggin ,  Kelly Elizabeth Hamilton ,  Paula Frances McElhinney ,  Fadi El Hallak

IPC: G11B11/00 ,  G11B5/48 ,  G02B6/136 ,  G02B6/132 ,  G02B6/122 ,  G02B6/126 ,  G02B6/27 ,  G11B11/105 ,  G11B5/60 ,  G11B7/1387 ,  G11B5/00

Abstract: An apparatus includes an input coupler configured to receive light excited by a light source. A near-field transducer (NFT) is positioned at a media-facing surface of a write head. A layered waveguide is positioned between the input coupler and the NFT and configured to receive the light output from the input coupler in a transverse electric (TE) mode and deliver the light to the NFT in a transverse magnetic (TM) mode. The layered waveguide comprises a first layer extending along a light-propagation direction. The first layer is configured to receive light from the input coupler. The first layer tapers from a first cross track width to a second cross track width where the second cross track width is narrower than the first cross track width. The layered waveguide includes a second layer that is disposed on the first layer. The second layer has a cross sectional area in a plane perpendicular to the light propagation direction that increases along the light propagation direction. The cross sectional area of the second layer is smaller proximate to the input coupler and larger proximate to the NFT.

公开(公告)号：US20180211685A1

公开(公告)日：2018-07-26

申请号：US15412144

申请日：2017-01-23

Applicant: Seagate Technology LLC

Inventor： Reyad Mehfuz ,  Aidan Dominic Goggin ,  Kelly Elizabeth Hamilton ,  John Bernard McGurk

IPC: G11B5/48 ,  G02B6/14 ,  G02B6/125

CPC classification number: G11B5/4866 ,  G02B6/125 ,  G02B6/14 ,  G11B5/6088 ,  G11B2005/0021

Abstract: A write head comprises a waveguide core configured to receive light emitted in a crosstrack direction from a light source at a fundamental transverse electric (TE00) mode. The waveguide core comprises a first turn that receives the light in the crosstrack direction redirects the light to an opposite crosstrack direction and a second turn that redirects the light to a direction normal to a media-facing surface of the write head. The waveguide core comprises a straight section that couples the first and second turns and a branched portion extending from the straight section. The branched portion is configured to convert the light to a higher-order (TE10) mode. A near-field transducer at the media-facing surface is configured to receive the light at the TE10 mode from the waveguide and directs surface plasmons to a recording medium in response thereto.