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Two-dimensional photonic crystal and optical device using the same

Foreign code F110003701
File No. J1017-06WO,701
Posted date Jul 4, 2011
Country United States of America
Application number 79419205
Gazette No. 20080124037
Gazette No. 7912335
Date of filing Dec 28, 2005
Gazette Date May 29, 2008
Gazette Date Mar 22, 2011
International application number JP2005024066
International publication number WO2006070867
Date of international filing Dec 28, 2005
Date of international publication Jul 6, 2006
Priority data
  • P2004-378706 (Dec 28, 2004) JP
  • 2005WO-JP24066 (Dec 28, 2005) WO
Title Two-dimensional photonic crystal and optical device using the same
Abstract (US7912335)
An object of the present invention is to provide a two-dimensional photonic crystal in which conditions for both the TE-polarized light and the TM-polarized light can be easily satisfied.
A body includes a first area having a triangular lattice pattern arrangement of a circular hole and a second area having a triangular lattice pattern arrangement of an equilateral triangular holes.
Therefore, the TE-PBG which is a photonic band gap (PBG) for the TE-polarized light is created in the first area, and the TM-PBG which is a PBG for the TM-polarized light is created in the second area.
Parameters such as the period and size of the holes can be independently set for the first area and the second area, so that an energy region common to the TE-PBG and the TM-PBG (i.e. absolute PBG) can be made larger and easily created.
Forming a waveguide and resonators and or the like corresponding to an energy within the absolute PBG allows formation of a polarized light multiplexer/demultiplexer and a frequency (wavelength) multiplexer/demultiplexer without depending on polarized light or the like.
Scope of claims [claim1]
1. A two-dimensional photonic crystal having a periodic arrangement of refractive index distribution in a slab-shaped body, comprising: a) a first area having a photonic band gap for TE-polarized light; and
b) a second area provided adjacent to the first area and having a photonic band gap for TM-polarized light, in which at least a part of an energy region is common to the photonic band gap of the TE-polarized light,
wherein a waveguide passing through both the first area and the second area is provided for conducting light having energy within the part of the common energy region, the waveguide being defects created linearly in the first area connected to defects created linearly in the second area, and passing continuously through both the first and second areas, and
a resonator is provided in the vicinity of the waveguides of the first area and the second area respectively, where the resonator resonates with the polarized light corresponding to the area.
[claim2]
2. The two-dimensional photonic crystal according to claim 1, wherein a second waveguide passing through either the first area or the second area and interposing the resonator of the given area with the waveguide is formed.
[claim3]
3. The two-dimensional photonic crystal according to claim 1, wherein a second waveguide passing through both of the first area and the second area and interposing the resonators of the both areas with the waveguide is formed.
[claim4]
4. A two-dimensional photonic crystal wherein the two-dimensional photonic crystal according to claim 1 functions as a single construction unit; a plurality of the construction units are connected; and waveguides in the entire construction units are connected continuously.
[claim5]
5. The two-dimensional photonic crystal according to claim 1, wherein the body thickness is consistent in the entire areas.
[claim6]
6. An optical function element using the two-dimensional photonic crystal according to claim 1.
[claim7]
7. The two-dimensional photonic crystal according to claim 1, wherein the refractive index distribution of the first area has a triangular lattice pattern arrangement of modified refractive index areas of a circular shape, and the refractive index distribution of the second area has a triangular lattice pattern arrangement of modified refractive index areas of an equilateral triangular shape.
  • Inventor, and Inventor/Applicant
  • NODA SUSUMU
  • ASANO TAKASHI
  • TAKAYAMA SEIICHI
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • TDK
IPC(International Patent Classification)
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