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Two-dimensional photonic crystal slab having three-dimensional local structure

Foreign code F110005158
File No. A112-31US
Posted date Aug 24, 2011
Country United States of America
Application number 53711903
Gazette No. 20060051042
Gazette No. 7397994
Date of filing Dec 5, 2003
Gazette Date Mar 9, 2006
Gazette Date Jul 8, 2008
International application number JP2003015635
International publication number WO2004053548
Date of international filing Dec 5, 2003
Date of international publication Jun 24, 2004
Priority data
  • P2002-355631 (Dec 6, 2002) JP
  • 2003WO-JP15635 (Dec 5, 2003) WO
Title Two-dimensional photonic crystal slab having three-dimensional local structure
Abstract (US7397994)
The present invention aims to provide a two-dimensional photonic crystal having an optical resonator, which allows the control of the front/back emission ratio of light.
To achieve this object, a refractive index member made of a material having a refractive index different from that of air is mounted on a two-dimensional photonic crystal having a body in which holes are periodically arranged.
In this construction, the body and the refractive index member cooperatively function as an optical resonator located at the position where the refractive index member is mounted.
The light emitted from this optical resonator is stronger on the side having a higher refractive index, i.e. on the side where the refractive index member is mounted.
Accordingly, the light emitted from the side where the refractive index member is mounted is stronger than the light emitted from the other side.
The ratio of the emission intensity of the two rays of light and, i.e. the front/back emission ratio, can be controlled by changing the material, shape and/or size of the refractive index member.
Scope of claims [claim1]
1. A two-dimensional photonic crystal slab having a three-dimensional local structure, comprising:
a) a slab-shaped body;
b) a plurality of areas having a refractive index different from that of the body, which are periodically arranged in the body;
and
c) an optical resonator formed by mounting a refractive index member on the surface of the body.
[claim2]
2. The two-dimensional photonic crystal slab having a three-dimensional local structure according to claim 1, further comprising: a waveguide formed by providing a linear defect of the modified refractive index areas in proximity to the refractive index member.
[claim3]
3. The two-dimensional photonic crystal slab having a three-dimensional local structure according to claim 1, wherein two or more pieces of the refractive index members differing in material, shape or size are mounted on the body.
[claim4]
4. The two-dimensional photonic crystal slab having a three-dimensional local structure according to claim 1, wherein a point-like defect of the modified refractive index areas are provided within the body and a refractive index member is additionally mounted at the position of the point-like defect.
[claim5]
5. The two-dimensional photonic crystal slab having a three-dimensional local structure according to claim 4, wherein a plurality of point-like defects of the modified refractive index areas having different resonant wavelengths are provided within the body, and a plurality of the refractive index members identical in material, shape and size are arranged on a surface of the body at positions of the point-like defects.
[claim6]
6. The two-dimensional photonic crystal slab having a three-dimensional local structure according to claim 1, wherein the refractive index members are mounted on both sides of the body.
[claim7]
7. The two-dimensional photonic crystal slab having a three-dimensional local structure according to claim 6, wherein the refractive index members are mounted at the same position on both sides of the body.
[claim8]
8. The two-dimensional photonic crystal slab having a three-dimensional local structure according to claim 7, wherein identical refractive index members are mounted at the same position on both sides of the body.
[claim9]
9. The two-dimensional photonic crystal slab having a three-dimensional local structure according to claim 1, wherein it is provided with a point-like defect of the modified index areas asymmetrical between front and back sides.
[claim10]
10. The two-dimensional photonic crystal slab having a three-dimensional local structure according to claim 1, wherein the refractive index member is made of the same material as that of the body.
[claim11]
11. The two-dimensional photonic crystal slab having a three-dimensional local structure according to claim 1, wherein the refractive index member is made of a material whose refractive index changes when the material receives an external operation.
[claim12]
12. A two-dimensional photonic crystal slab having a three-dimensional local structure, comprising:
a) a slab-shaped body:
b) a plurality of areas having a refractive index different from that of the body, which are periodically arranged in the body;
and
c) a refractive index member mounted on the surface of the body, wherein the refractive index member is a cylinder whose top is concave or convex.
[claim13]
13. A method of manufacturing the two-dimensional photonic crystal slab having a three-dimensional local structure of claim 1, the method comprising: a process for creating a refractive index member in which a gas material used for creating a refractive index member is introduced onto a two-dimensional photonic crystal and a focused ion beam is irradiated onto the crystal to deposit the refractive index member.
[claim14]
14. A method of manufacturing the two-dimensional photonic crystal slab having a three-dimensional local structure of claim 1, the method comprising: a process for creating a refractive index member in which a refractive index member beforehand is mounted onto the two-dimensional photonic crystal with a nanomanipulator.
[claim15]
15. A two-dimensional photonic crystal slab having a three-dimensional local structure wherein the slab functions as an optical multiplexer/demultiplexer and the slab comprises:
a) a slab-shaped body;
b) a plurality of areas having a refractive index different from that of the body, which are periodically arranged in the body;c) an optical resonator formed by mounting a refractive index member on the surface of the body;
and
d) a waveguide formed by providing linearly arranged defects of the modified refractive index areas in proximity to the refractive index member.
  • Inventor, and Inventor/Applicant
  • NODA SUSUMU
  • ASANO TAKASHI
  • TANAKA YOSHINORI
  • 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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