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Photonic crystal coupling defect waveguide

外国特許コード F110003351
整理番号 A241-30WO
掲載日 2011年6月23日
出願国 アメリカ合衆国
出願番号 59147105
公報番号 20070280592
公報番号 7440658
出願日 平成17年3月1日(2005.3.1)
公報発行日 平成19年12月6日(2007.12.6)
公報発行日 平成20年10月21日(2008.10.21)
国際出願番号 JP2005003366
国際公開番号 WO2005085921
国際出願日 平成17年3月1日(2005.3.1)
国際公開日 平成17年9月15日(2005.9.15)
優先権データ
  • 特願2004-058536 (2004.3.3) JP
  • 2005WO-JP03366 (2005.3.1) WO
発明の名称 (英語) Photonic crystal coupling defect waveguide
発明の概要(英語) (US7440658)
A photonic crystal directional coupler composed of at least two linear defect waveguides introduced into a photonic crystal.
The medium constant and the lattice constant of the photonic crystal at the photonic crystal directional coupling part, the sizes and shapes of the elements constituting the periodical structure of the photonic crystal are varied.
Thereby the difference in propagation constant between the even and odd modes of the photonic crystal directional coupling part is increased, thus shortening the coupling length of the photonic crystal directional coupler.
特許請求の範囲(英語) [claim1]
1. A photonic crystal coupling defect waveguide comprising: a photonic crystal including photonic crystal elements constituting a periodic structure and, for suppressing propagation of an electromagnetic field including light or a radio wave of a specific wavelength or in a specific frequency range;
and
a coupling waveguide including at least two waveguides, each of which includes a line defect that is a plurality of defects which are portions where the photonic crystal elements constituting the periodic structure of the photonic crystal are locally removed as line and forms the waveguide in the photonic crystal, and an input end or an output end for inputting and/or outputting the electromagnetic field and, which are mode-coupled to each other and, in which an electromagnetic field inputted to one of the waveguides causes an electromagnetic field to be propagated to the other waveguide,whereinby one of or more than one of (1) effectively changing a medium constant including one of or more than one of a dielectric constant, a refractive index, a conductivity and a magnetic permeability of the photonic crystal, (2) effectively changing size or shape of the photonic crystal elements, and (3) changing a lattice constant indicating a periodic interval of the photonic crystal elements,(a) band structures of an even mode and an odd mode of the coupling waveguide are shifted with respect to a normalized frequency, or (b) the band structures of the even mode and the odd mode of the coupling waveguide are respectively changed at different degrees;
and by this, a difference in propagation constant between the even mode and the odd mode at a normalized frequency is made large, and a coupling length of a mode-coupled propagating electromagnetic wave which propagates in the coupling waveguide is made short,further whereinin the part of the photonic crystal including the part of or the whole of the coupling waveguide, the shape of the photonic crystal elements are not changed with respect to the another part, and the lattice constant and the size of the photonic crystal elements are changed similarly and at a same rate as compared with the another part.
  • 発明者/出願人(英語)
  • FURUYA KATSUMI
  • KOMORI KAZUHIRO
  • YAMAMOTO NORITSUGU
  • WATANABE YOSHINORI
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
国際特許分類(IPC)
参考情報 (研究プロジェクト等) CREST Creation of Nanodevices and System Based on New Physical Phenomena and Functional Principles AREA
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