Ridge waveguide with recess

Details Ridge waveguide with recess Ridge waveguide with recess

2007-09-18

2007-09-18

Dinh, Tan (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C385S038000

Reexamination Certificate

active

10402880

ABSTRACT:
A ridge waveguide having a recessed ridge forming an isolated tip at a terminal end of the waveguide's aperture efficiently couples light into a spot adjacent to the tip in a medium below the terminal end of the waveguide which is significantly smaller than the light's wavelength. The waveguide is used to heat a recording medium via the small spot for heat assisted recording or to pattern substrates by photolithography with line width exposures that are significantly smaller than the wavelength of light. The body of the waveguide may also be recessed away from the medium in an area surrounding the waveguide's aperture to further confine the energy emerging from the waveguide to the small spot adjacent the tip in the medium.

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