Optical head, information storage apparatus, optical head...

Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system

Reexamination Certificate

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C369S126000, C385S147000

Reexamination Certificate

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11501257

ABSTRACT:
An optical head has a first propagation section made of a first low extinction material and installed along an optical axis, a pair of second propagation sections which, being made of a second low extinction material, sandwich the first propagation section, a pair of first confining sections which, being made of a material with propagation capability lower than that of the second propagation sections, further sandwich the first propagation section and second propagation sections from outside the second propagation sections, and a pair of third propagation sections which, being made of a material with light propagation capability higher than that of the first confining sections, further sandwich the first confining sections from outside. Also, an optical head design apparatus calculates a complex propagation constant along an optical axis by solving an equation which is based on F matrices, and thereby design an optical head in a far-sighted manner.

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Matsumoto et al.; “Fabrication of a Near-Field Optical Fiber Probe with a Nanomeric Metallized Protrusion”; Optical Review, Vo. 5, No. 6; pp. 369-373; 1998.
Yatsui et al.; “Increasing throughput of a near-field optical fiber probe over 1000 times by the use of a triple-tapered structure”; Applied Physics Letters, vol. 73, No. 15; pp. 2090-2092; Oct. 12, 1998.

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