Optical waveguides – Planar optical waveguide – Thin film optical waveguide
Reexamination Certificate
2006-03-28
2006-03-28
Ullah, Akm Enayet (Department: 2874)
Optical waveguides
Planar optical waveguide
Thin film optical waveguide
C359S586000
Reexamination Certificate
active
07020373
ABSTRACT:
A one-dimensional photonic crystal has a spatial distribution in which the refractive index periodically varies in a first direction that light is caused to be propagated and in which the refractive index is uniform in a second direction perpendicular to the first direction. An antireflective coating structure for the one-dimensional photonic crystal includes a thin-film having a refractive index and a thickness determined by a predetermined calculation method. A two or three-dimensional photonic crystal comprises two or more media that have different refractive indexes and are arranged in a two or three-dimensional pattern. An antireflective coating structure for the two or three-dimensional photonic crystal includes a thin-film comprising one of the media included in the photonic crystal. In the structure, the thin-film is disposed on an end face of the photonic crystal so as to increase the incident efficiency of light entering the photonic crystal. Thereby, the reflection of the photonic crystal is securely prevented in a simple manner.
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Shirane Masayuki
Ushida Jun
NEC Corporation
Ostrolenk Faber Gerb & Soffen, LLP
Ullah Akm Enayet
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