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:
May. 04, 2010
Filed:
Aug. 30, 2005
Susumu Noda, Kyoto, JP;
Takashi Asano, Kyoto, JP;
Hitoshi Kitagawa, Ota-ku, JP;
Seiichi Takayama, Chuo-ku, JP;
Susumu Noda, Kyoto, JP;
Takashi Asano, Kyoto, JP;
Hitoshi Kitagawa, Ota-ku, JP;
Seiichi Takayama, Chuo-ku, JP;
Abstract
The present invention intends to provide a two-dimensional photonic crystal having a wide photonic band gap (PBG). In a slab-shaped body, a number of holes, whose sectional shape on a plane parallel to the slab surface is an equilateral triangle, are periodically arranged in a triangular lattice pattern. The upper and lower sides of the holesare covered with the material of the body. The aforementioned sectional shape is uneven along the direction perpendicular to the slab surface. This construction expands the PBG for TM-polarized light and thereby increases its energy region overlapping with the PBG for TE-polarized light. This overlapping section is the complete PBG. If a ray of light whose wavelength corresponds to an energy level within the complete PBG, neither the TE-polarized nor TM-polarized component of the light can be propagated through the photonic crystal. Therefore, even if a waveguide and/or a resonator is provided in the photonic crystal, the light having the aforementioned wavelength will never leak from the waveguide or resonator into the photonic crystal.