News Column

Patent Issued for Gradient Index Optical Waveguide Coupler

July 1, 2014



By a News Reporter-Staff News Editor at Journal of Technology -- Seagate Technology LLC (Cupertino, CA) has been issued patent number 8755650, according to news reporting originating out of Alexandria, Virginia, by VerticalNews editors.

The patent's inventor is Peng, Chubing (Minnetonka, MN).

This patent was filed on September 8, 2011 and was published online on June 17, 2014.

From the background information supplied by the inventors, news correspondents obtained the following quote: "The present disclosure relates to optical components used in applications such as heat assisted magnetic recording (HAMR). A HAMR device utilizes a magnetic recording media (e.g., hard drive disk) that is able to overcome superparamagnetic effects that might otherwise limit the areal data density of typical magnetic media. In order to record on this media, a small portion of the media must be locally heated while being written to by a magnetic write head. A coherent light source such as a laser may provide the energy to create these hot spots, and optical components, e.g., built in to a slider that houses the write head, are configured direct this energy onto the media."

Supplementing the background information on this patent, VerticalNews reporters also obtained the inventor's summary information for this patent: "Various embodiments described herein are generally directed to methods, systems, and apparatuses that facilitate providing light in a selected waveguide mode for a near field transducer of a heat assisted magnetic recording head. In one embodiment, a waveguide of an apparatus includes a core layer extending along a propagation length of the waveguide. A cladding layer surrounds at least part of the core layer along the propagation length. A gradient index material layer is disposed beside the core layer along a portion of the propagation length where light is launched into the waveguide via an input facet. The gradient index material layer is configured to direct light from the input facet to the core layer at least along the portion of the propagation length.

"In another embodiment, a method involves coupling a light source to an input facet that directs light from the light source to a) a core layer of a waveguide, and b) a gradient index material layer disposed beside the core layer along a portion of a propagation length of the waveguide. The light is launched from the light source into the input facet so that the gradient index material layer directs the light to the core layer at least along the portion of the propagation length.

"These and other features and aspects of various embodiments may be understood in view of the following detailed discussion and accompanying drawings."

For the URL and additional information on this patent, see: Peng, Chubing. Gradient Index Optical Waveguide Coupler. U.S. Patent Number 8755650, filed September 8, 2011, and published online on June 17, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8755650.PN.&OS=PN/8755650RS=PN/8755650

Keywords for this news article include: Seagate Technology LLC.

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Source: Journal of Technology