Optical waveguide and thermally-assisted magnetic recording head therewith
US8270791B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 5, 2010 |
| Grant date | Sep 18, 2012 |
| Priority date | — |
| Expiry date | Oct 5, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0021
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical waveguide of the invention includes a core that is a waveguide through which light propagates; and a cladding that surrounds the core. The core has a plate shape and includes a wide core base part onto which the light is incident, a taper part that is connected to the core base part and of which a width is gradually tapered along a propagation direction, and a narrow front end core part that is connected to the taper part and that extends along the propagation direction. A grating is provided on one of planar surfaces of the wide core base part, the grating is formed by engraving a number of concave grooves having a rectangular cross section on the planar surface along a width direction thereof, the grating is formed to be optically coupled with laser light that is incident perpendicularly onto the grating formation surface, a frequency (grating pitch: pitch of the concave grooves) of the grating is smaller than a wavelength (defined as a wavelength in the cladding) of the perpendicularly incident laser light, and a groove depth H1 of the grating is formed with respect to a thickness H2 of the core base part so that a relationship H1=(0.33 to 0.67)×H2 is satisfied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.