Near-field optical transducers for thermal assisted magnetic and optical data storage
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United States of America Patent
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Feb 12, 2008
Grant Date -
Apr 14, 2005
app pub date -
Oct 10, 2003
filing date -
Oct 10, 2003
priority date (Note) -
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Abstract
An optical transducer comprises an optical element for directing an electromagnetic wave to a focal region and a metallic nano-structure having a longitudinal axis substantially parallel to an electric field of the electromagnetic wave, the metallic nano-structure being positioned outside of the optical element, wherein the electromagnetic wave produces surface plasmons on the metallic nano-structure. A cladding material having a refractive index differing from the refractive index of the optical element can be positioned adjacent to a surface of the metallic nano-structure. Magneto-optical recording heads that include the transducers and disc drives that include the magneto-optical recording heads are also included.
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