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Two-dimensional photonic crystal optical resonator and optical reflector using interference between point defects

Foreign code F110005157
File No. A112-28US
Posted date Aug 24, 2011
Country United States of America
Application number 50814503
Gazette No. 20050147371
Gazette No. 6996319
Date of filing Mar 26, 2003
Gazette Date Jul 7, 2005
Gazette Date Feb 7, 2006
International application number JP2003003763
International publication number WO2003081305
Date of international filing Mar 26, 2003
Date of international publication Oct 2, 2003
Priority data
  • P2002-086222 (Mar 26, 2002) JP
  • 2003WO-JP03763 (Mar 26, 2003) WO
Title Two-dimensional photonic crystal optical resonator and optical reflector using interference between point defects
Abstract (US6996319)
The present invention provides a two-dimensional photonic crystal optical resonator and reflector having high light-extracting efficiency.
A two-dimensional photonic crystal consisting of a slab-shaped body is created by periodically arranging holes having a refractive index different from that of the body.
A waveguide is formed by providing a linear zone where no hole is bored.
Two acceptor type point defects are formed by enlarging two holes spaced apart from each other by a distance L in the longitudinal direction of the waveguide.
An appropriate selection of the distance L suppresses or increases the reflection and transmission of light at the point defects, allowing an efficient extraction of light resonating at the point defects.
This allows the body to be used as an optical resonator for producing a resonance of light between the two point defects or optical reflector for reflecting light at the two point defects.
Scope of claims [claim1]
1. A two-dimensional photonic crystal optical resonator using interference between point defects, characterized in that it comprises:
a) a slab-shaped body;
b) a plurality of modified refractive index areas having a refractive index different from that of the body, which are periodically arranged in the body;c) one waveguide formed in the body by making defects of the modified refractive index areas linearly;
and
d) a point-like defect pair consisting of two point-like defects of the same type, which are located in proximity to the waveguide and spaced apart from each other in the longitudinal direction of the waveguide by a distance (2n-1)/4 times as long as the resonance wavelength of interest, where n is a positive integer,and in that it extracts light from the waveguide in the body at one of the two point-like defects that is first encountered by the light propagating through the waveguide.
[claim2]
2. The two-dimensional photonic crystal optical resonator using interference between point defects according to claim 1, characterized in that each defect of the point-like defect pair is a cluster defect composed of two or more defects adjacent to each other.
[claim3]
3. The two-dimensional photonic crystal optical resonator using interference between point defects according to claim 1, characterized in that each defect constituting the point-like defect pair is located at the same distance from the waveguide.
[claim4]
4. The two-dimensional photonic crystal optical resonator using interference between point defects according to claim 1, characterized in that the modified refractive index areas consist of holes bored in the body.
[claim5]
5. A two-dimensional photonic crystal optical resonator using interference between point defects, characterized in that it comprises:
a) a slab-shaped body;
b) a plurality of modified refractive index areas having a refractive index different from that of the body, which are periodically arranged in the body;c) a waveguide formed in the body by making defects of the modified refractive index areas linearly;
and
d) a point-like defect pair consisting of two point-like defects of the same type, which are located in proximity to the waveguide and spaced apart from each other in the longitudinal direction of the waveguide by a distance n/2 times as long as a resonance wavelength of interest, where n is a positive integer.
[claim6]
6. The two-dimensional photonic crystal optical resonator using interference between point defects according to claim 5, characterized in that each defect of the point like-defect pair is a cluster defect composed of two or more defects adjacent to each other.
[claim7]
7. The two-dimensional photonic crystal optical resonator using interference between point defects according to claim 5, characterized in that each defect constituting the point like-defect pair is an optical reflector consisting of two point defects of the same type, which are spaced apart from each other in the longitudinal direction of the waveguide by a distance m/2 times as long as the resonance wavelength of interest, where m is a positive integer and n>m.
[claim8]
8. The two-dimensional photonic crystal optical resonator using interference between point defects according to claim 7, characterized in that another optical reflector is located in opposition to the aforementioned optical reflector across the waveguide and in a width-direction of the waveguide.
[claim9]
9. The two-dimensional photonic crystal optical resonator using interference between point defects according to claim 7, characterized in that the point-like defect constituting the optical reflector is a cluster defect.
[claim10]
10. The two-dimensional photonic crystal optical resonator using interference between point defects according to claim 5, characterized in that the waveguide contains a laser medium.
[claim11]
11. The two-dimensional photonic crystal optical resonator using interference between point defects according to claim 5, characterized in that each defect constituting the point-like defect pair is located at the same distance from the waveguide.
[claim12]
12. The two-dimensional photonic crystal optical resonator using interference between point defects according to claim 5, characterized in that the modified refractive index areas consist of holes bored in the body.
[claim13]
13. A two-dimensional photonic crystal optical reflector using interference between point defects, characterized in that it comprises:
a) a slab-shaped body;b) a plurality of modified refractive index areas having a refractive index different from that of the body, which are periodically arranged in the body;c) a waveguide formed in the body by making defects of the modified refractive index areas linearly;
and
d) a point-like defect pair consisting of two point-like defects of the same type, which are located in proximity to the waveguide and spaced apart from each other in the longitudinal direction of the waveguide by a distance m/2 times as long as a resonance wavelength of interest, where m is a positive integer.
[claim14]
14. The two-dimensional photonic crystal optical reflector using interference between point defects according to claim 13, characterized in that it comprises another point-like defect pair of the same type located in opposition to the aforementioned point-like defect pair across the waveguide and in a width-direction of the waveguide.
[claim15]
15. The two-dimensional photonic crystal optical reflector using interference between point defects according to claim 13, characterized in that each defect constituting the point-like defect pair is located at the same distance from the waveguide.
[claim16]
16. The two-dimensional photonic crystal optical reflector using interference between point defects according to claim 13, characterized in that the modified refractive index areas consist of holes bored in the body.
[claim17]
17. The two-dimensional photonic crystal optical reflector using interference between point defects according to claim 13, characterized in that each defect of the point like-defect pair is a cluster defect composed of two or more defects adjacent to each other.
  • Inventor, and Inventor/Applicant
  • NODA SUSUMU
  • 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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