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:
Dec. 20, 2007
Ranko Hatsuda, Chuo-ku, JP;
Susumu Noda, Uji, JP;
Takashi Asano, Kyoto, JP;
Yoshinori Tanaka, Kyoto, JP;
Eiji Miyai, Kyoto, JP;
Ranko Hatsuda, Chuo-ku, JP;
Susumu Noda, Uji, JP;
Takashi Asano, Kyoto, JP;
Yoshinori Tanaka, Kyoto, JP;
Eiji Miyai, Kyoto, JP;
Kyoto University, Kyoto, JP;
TDK Corporation, Tokyo, JP;
Abstract
The present invention intends to provide a two-dimensional photonic crystal having a high level of mechanical strength and functioning as a high-efficiency resonator. The two-dimensional photonic crystal according to the present invention includes a slab layerunder which a clad layeris located. In the slab layer, areashaving a refractive index different from that of the slab layerare cyclically arranged to create a two-dimensional photonic crystal. A portion of the cyclic arrangement of the areasare omitted to form a point-like defect. This defectfunctions as a resonator at which a specific wavelength of light resonates. An air-bridge cavityfacing the point-like defectis formed over a predetermined range of the clad layer. In this construction, the clad layersupports the slab layerexcept for the range over which the air-bridge spaceis formed. Therefore, the two-dimensional photonic crystal has a high level of mechanical strength. The presence of the air-bridge spaceunder the point-like defectmakes it easy to confine light at the point-like defectby the difference in the refractive index between the slab layerand the air. Thus, the point-like defectfunctions as a high-performance resonator.