The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 11, 2008
Filed:
Oct. 02, 2006
Susumu Noda, Uji, JP;
Takashi Asano, Kyoto, JP;
Yoshihiro Akahane, Itami, JP;
President, Kyoto University, Kyoto, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
In 2D photonic crystals, cavities having a heightened Q factor are made available, wherein combining the high Q cavities with waveguides affords channel add/drop filters having high resolution. In a cavity constituted by a point defect within a 2D photonic crystal, the 2D photonic crystal is configured by an arrangement, in a two-dimensional lattice of points defined in a slab (), of low-refractive-index substances () having a low refractive index relative to the slab () and being of identical dimension and shape. The point defect () contains a plurality of three or more lattice points that neighbor one another, and in these lattice points no low-refractive-index substances () are arranged; therein the dimension of the low-refractive-index substance () that should be arranged to correspond to at least one of the lattice points nearest the point defect () is dimensionally altered from a predetermined dimension.