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US 2003/0142385 A1Published application
Optical element
AssigneeNippon Sheet Glass Co., Ltd.
InventorsShigeo Kittaka, Kazuaki Oya, Masatoshi Nara
Life of this patent
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Abstract
In the invention, light incident onto an end surface of one-dimensional photonic crystal is phase-modulated in the same period and direction as those of the photonic crystal to thereby propagate only specific high-order band light in the photonic crystal. That is, a phase modulation unit for generating phase-modulated wave having the same period as that of the periodic structure is disposed adjacent or close to a light incident surface of the periodic structure.
Claims9
An optical element comprising:
- a multilayer structure containing repetition of a periodic structure as at least one repeatable region of a predetermined period, an end surface of said multilayer structure substantially perpendicular to layer surfaces of said multilayer structure being used as a light input surface;
- wherein said optical element further comprises:
- a phase modulation unit disposed adjacent or close to said light input surface for generating phase-modulated wave having the same period as the period of said periodic structure in a laminating direction of said multilayer structure.
Dependencies are inferred from the claim text.