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Two-dimensional photonic crystal optical multiplexer/demultiplexer

外国特許コード F110005156
整理番号 A112-27US
掲載日 2011年8月24日
出願国 アメリカ合衆国
出願番号 50788903
公報番号 20050146778
公報番号 7590325
出願日 平成15年3月26日(2003.3.26)
公報発行日 平成17年7月7日(2005.7.7)
公報発行日 平成21年9月15日(2009.9.15)
国際出願番号 JP2003003762
国際公開番号 WO2003081304
国際出願日 平成15年3月26日(2003.3.26)
国際公開日 平成15年10月2日(2003.10.2)
優先権データ
  • 特願2002-086221 (2002.3.26) JP
  • 2003WO-JP03762 (2003.3.26) WO
発明の名称 (英語) Two-dimensional photonic crystal optical multiplexer/demultiplexer
発明の概要(英語) (US7590325)
The present invention provides an optical multiplexer/demultiplexer that can be smaller in size and higher in Q-factor or efficiency.
This object is achieved by the following construction.
In a slab-shaped body 11, low refractive index areas 12 having a refractive index lower than that of the material of the body 11 are periodically arranged to construct a two-dimensional photonic crystal, in which a waveguide 13 is formed by not boring holes 12 linearly.
A donor type cluster defect 14 is formed by not boring holes 12 at two ore more lattice points located adjacent to the waveguide 13.
With this construction, only a specific wavelength of light included in the light propagating through the waveguide 13 resonates at the donor type cluster 14, and the light thus trapped is released to the outside (demultiplexing).
Conversely, only a specific wavelength of light may be introduced through the donor type cluster defect 14 into the waveguide 13 (multiplexing).
特許請求の範囲(英語) [claim1]
1. A two-dimensional photonic crystal optical multiplexer/demultiplexer, comprising: a slab-shaped body;
a plurality of modified refractive index areas having a refractive index different from that of the body, which are periodically arranged in the body;
a waveguide formed in the body making defects of the modified refractive index areas linearly; and
a cluster defect located in proximity to the waveguide and composed of two or more adjacent defects without intervening non-defects, the defects being locations where the modified refractive index areas should exist, based on their periodic arrangement, but do not.
[claim2]
2. The two-dimensional photonic crystal optical multiplexer/demultiplexer according to claim 1, wherein the cluster defect is composed of three defects adjacent to each other in the form of a triangle.
[claim3]
3. The two-dimensional photonic crystal optical multiplexer/demultiplexer according to claim 1, wherein the cluster defect is composed of three defects adjacent to each other on a straight line parallel to the waveguide.
[claim4]
4. The two-dimensional photonic crystal optical multiplexer/demultiplexer according to claim 3, wherein the cluster defect composed of three defects adjacent to each other on a straight line is located on a fourth row of the modified refractive index areas from the waveguide.
[claim5]
5. A two-dimensional photonic crystal optical multiplexer/demultiplexer, comprising: a slab-shaped body;
two or more forbidden band zones formed in the body;
a plurality of modified refractive index areas having a refractive index different from that of the body, which are periodically arranged within each forbidden band zone of the body with a periodic cycle that is differently determined for each forbidden band zone;
a waveguide passing through all the forbidden band zones, which is formed by making defects of the modified refractive index areas linearly within each forbidden band zone; and
point-like defect resonators each composed of a point-like defect which is composed of one or more defects adjacent to each other and is formed in proximity to the waveguide within each of the forbidden band zones.
[claim6]
6. The two-dimensional photonic crystal optical multiplexer/demultiplexer according to claim 5, wherein at least one of the point-like defects each formed in proximity to the waveguide within each of the forbidden band zones is a cluster defect composed of two or more defects adjacent to each other.
[claim7]
7. The two-dimensional photonic crystal optical multiplexer/demultiplexer according to claim 6, wherein at least one of the point-like defects each formed in each of the forbidden band zones is a cluster defect composed of three defects adjacent to each other in the form of a triangle.
[claim8]
8. The two-dimensional photonic crystal optical multiplexer/demultiplexer according to claim 6, wherein at least one of the point-like defects each formed in each of the forbidden band zones is a cluster defect composed of three defects adjacent to each other on a straight line parallel to the waveguide.
[claim9]
9. The two-dimensional photonic crystal optical multiplexer/demultiplexer according to claim 8, wherein the cluster defect composed of three defects adjacent to each other on a straight line is located on a fourth row of the modified refractive index areas from the waveguide.
[claim10]
10. The two-dimensional photonic crystal optical multiplexer/demultiplexer according to claim 1, wherein the thickness of the modified refractive index area is 20 to 30% of the thickness of the body.
[claim11]
11. The two-dimensional photonic crystal optical multiplexer/demultiplexer according to claim 1, wherein the modified refractive index area is a low refractive index area whose refractive index is lower than that of the body.
[claim12]
12. The two-dimensional photonic crystal optical multiplexer/demultiplexer according to claim 11, wherein the low refractive index area is a hole.
[claim13]
13. The two-dimensional photonic crystal optical multiplexer/demultiplexer according to claim 5, wherein the defect of the modified refractive index area is composed of a modified refractive index area whose thickness extends from one face of the body to 5 to 40% of a thickness of the body.
[claim14]
14. The two-dimensional photonic crystal optical multiplexer/demultiplexer according to claim 13, wherein the thickness of the modified refractive index area is 20 to 30% of the thickness of the body.
[claim15]
15. The two-dimensional photonic crystal optical multiplexer/demultiplexer according to claim 5, wherein the modified refractive index area is a low refractive index area whose refractive index is lower than that of the body.
[claim16]
16. The two-dimensional photonic crystal optical multiplexer/demultiplexer according to claim 15, wherein the low refractive index area is a hole.
[claim17]
17. The two-dimensional photonic crystal optical multiplexer/demultiplexer according to claim 16, wherein the defect of the modified refractive index area is a donor type defect formed by not boring a hole in the body.
[claim18]
18. The two-dimensional photonic crystal optical multiplexer/demultiplexer according to claim 16, wherein the defect of the modified refractive index area is an acceptor type defect formed by providing a hole having a diameter larger than that of the other holes.
  • 発明者/出願人(英語)
  • NODA SUSUMU
  • MOCHIZUKI MASAMITU
  • ASANO TAKASHI
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
米国特許分類/主・副
  • 385/129
  • 385/45
  • 385/130
  • 385/131
参考情報 (研究プロジェクト等) CREST Function Evolution of Materials and Devices based on Electron/Photon Related Phenomena AREA
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