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:
Mar. 24, 2009
Filed:
Jan. 31, 2006
Susumu Noda, Kyoto, JP;
Takashi Asano, Kyoto, JP;
Seiichi Takayama, Chuo-ku, JP;
Ranko Hatsuda, Chuo-ku, JP;
Susumu Noda, Kyoto, JP;
Takashi Asano, Kyoto, JP;
Seiichi Takayama, Chuo-ku, JP;
Ranko Hatsuda, Chuo-ku, JP;
TDK Corporation, Tokyo, JP;
Abstract
An objective of the present invention is to provide a two-dimensional photonic crystal in which a complete photonic band gap (PBG), i.e. a photonic band gap that is effective for both a TE-polarized light and a TM-polarized light within a predetermined wavelength range, is created and an adequate width of the complete PBG can be ensured. A slab-shaped bodyconsisting of a birefringent material is provided with holesperiodically arranged in a triangular lattice pattern, where a plane shape of the hole is an equilateral triangle. The PBG for the TE-polarized light and the PBG for the TM-polarized light can be independently set by adjusting anisotropy in the refractive index of the body, i.e. a refractive index in a direction vertical to the bodyand a refractive index in a direction parallel to the bodyThis construction makes it possible to ensure an adequate width of the complete PBG.