Apparatus and method for coupling light to a thin film...

Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium

Reexamination Certificate

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C369S044230, C369S013110, C385S014000, C385S050000

Reexamination Certificate

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07151738

ABSTRACT:
An optical waveguide comprises a core guiding layer; a cladding layer positioned adjacent to the core guiding layer; a reflective layer positioned adjacent to the cladding layer; and a grating for coupling light into the core guiding layer; wherein the cladding layer has a thickness such that a ray reflected from the reflective layer is phase matched to an incident ray at the grating. A method of coupling electromagnetic radiation into the optical waveguide is also described.

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J. H. Harris et al., “Theory and Design of Periodic Couplers,”Applied Optics, vol. 11, No. 10, Oct. 1972, pp. 2234-2241.
T. Tamir et al., “Analysis and Design of Grating Couplers,”Applied Physics, vol. 14, Jun. 28, 1977, pp. 235-254.

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