Anti-reflection waveguide for heat-assisted magnetic recording
AssigneeHGST Netherlands B.V.
InventorsSeheon Kim, Takuya Matsumoto, Shen Ren, Barry C. Stipe
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Abstract
A system, according to one embodiment, includes a magnetic head having: a near field transducer, an optical waveguide for illumination of the near field transducer, and an anti-reflection block positioned along the optical waveguide farther from a media facing side of the magnetic head than the near field transducer. The anti-reflection block is positioned a distance from the near field transducer to destructively interfere with light reflected away from the near field transducer. Other systems, methods, and computer program products are described in additional embodiments.
Claims20
A system, comprising:
- a magnetic head having:
- a near field transducer;
- an optical waveguide for illumination of the near field transducer;
- and
- an anti-reflection block positioned along the optical waveguide farther from a media facing side of the magnetic head than the near field transducer,
- wherein the anti-reflection block is positioned a distance from the near field transducer to destructively interfere with light reflected away from the near field transducer.
A system, comprising:
- a magnetic head having:
- a near field transducer;
- an optical waveguide for illumination of the near field transducer;
- and
- an anti-reflection block positioned along the optical waveguide farther from a media facing side of the magnetic head than the near field transducer,
- wherein the anti-reflection block is positioned a distance from the near field transducer to destructively interfere with light reflected away from the near field transducer,
- wherein the distance results in a near zero reflectance of light from the near field transducer in the waveguide of less than about 0.1% light reflectance,
- wherein a height of the anti-reflection block in a height direction is less than about 200 nm.
Dependencies are inferred from the claim text.