Plasmon shield to shape and reduce optical spot

Details Plasmon shield to shape and reduce optical spot Plasmon shield to shape and reduce optical spot

2010-05-28

2011-10-11

Neyzari, Ali (Department: 2627)

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

C369S013330, C369S112270, C369S013130, C360S245300, C360S059000

Reexamination Certificate

active

08036069

ABSTRACT:
A TAMR head is disclosed with a triangular shaped plasmon antenna covered on two sides with a plasmon layer that generates an edge plasmon mode along a vertex of the two plasmon sides formed opposite a main pole layer. A plasmon shield (PS) is formed along the ABS and opposite the vertex to confine an electric field from the edge plasmon mode within a small radius of the edge plasmon tip thereby reducing the optical spot size on the magnetic medium and enhancing writability. An end of a waveguide used to direct input electromagnetic radiation to the plasmon antenna adjoins a PS side opposite the ABS. In one embodiment, a magnetic shield may be formed along the ABS and adjoins the PS so that a first PS section terminates at the ABS and faces the vertex while a second PS section is formed between the magnetic shield and waveguide end.

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Co-pending US Patent HT09-003, U.S. Appl. No. 12/456,290, filed Jun. 15, 2009, “Plasmon Antenna With Magnetic Core for Thermally Assisted Magnetic Recording,” assigned to the same assignee as the current invention.

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