Planar waveguide for heat assisted magnetic recording

Details Planar waveguide for heat assisted magnetic recording Planar waveguide for heat assisted magnetic recording

2006-04-11

2006-04-11

Doan, Jennifer (Department: 2874)

Optical waveguides

Planar optical waveguide

C385S130000, C385S131000, C385S132000

Reexamination Certificate

active

07027700

ABSTRACT:
Recording heads are provided that comprise a magnetic write pole, and a planar waveguide positioned adjacent to the magnetic write pole, the planar waveguide including a first metal layer, a second metal layer, a first optical layer positioned between the first and second metal layers, and a second optical layer for coupling an electromagnetic wave to the first optical layer at a resonant incident angle. The second optical layer for coupling an electromagnetic wave to the first optical layer at a resonant incident angle is positioned adjacent to a surface of the second metal layer opposite the first optical layer and/or a diffraction grating. A mode index lens can also be provided for confining the electromagnetic wave in a direction parallel to the plane of the first optical layer. Disc drives incorporating the recording heads and a method of magnetic recording performed by the recording heads are also disclosed.

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