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Two-dimensional photonic crystal optical multiplexer/demultiplexer

Foreign code F110005156
File No. A112-27US
Posted date Aug 24, 2011
Country United States of America
Application number 50788903
Gazette No. 20050146778
Gazette No. 7590325
Date of filing Mar 26, 2003
Gazette Date Jul 7, 2005
Gazette Date Sep 15, 2009
International application number JP2003003762
International publication number WO2003081304
Date of international filing Mar 26, 2003
Date of international publication Oct 2, 2003
Priority data
  • P2002-086221 (Mar 26, 2002) JP
  • 2003WO-JP03762 (Mar 26, 2003) WO
Title Two-dimensional photonic crystal optical multiplexer/demultiplexer
Abstract (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).
Scope of claims [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.
  • Inventor, and Inventor/Applicant
  • NODA SUSUMU
  • MOCHIZUKI MASAMITU
  • ASANO TAKASHI
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
IPC(International Patent Classification)
Reference ( R and D project ) CREST Function Evolution of Materials and Devices based on Electron/Photon Related Phenomena AREA
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