Optical control element
First Claim
1. An optical control element formed from a photonic crystal, said optical control element comprising:
- a first portion in the photonic crystal that has a first refraction index;
a second portion in the photonic crystal that has a second refraction index lower than the first refraction index; and
a refraction-index-distributed type defect wave guide;
wherein a difference between an effective refraction index of the first portion and an effective refraction index of the second portion changes continuously along a wave guiding direction of the refraction-index-distributed type defect wave guide.
1 Assignment
0 Petitions
Accused Products
Abstract
An optical control element is disclosed that can be made small and has a low loss, and is able to provide group speed control and wavelength dispersion of short light pulses. The optical control element is formed from a photonic crystal, and includes a first portion having a first refraction index in the photonic crystal, a second portion having a second refraction index lower than the first refraction index, and a refraction-index-distributed type defect wave guide. A difference effective refraction indexes between the first portion and the second portion near the refraction-index-distributed type defect wave guide, changing continuously or stepwise along a wave guiding direction of the refraction-index-distributed type defect wave guide.
18 Citations
28 Claims
-
1. An optical control element formed from a photonic crystal, said optical control element comprising:
-
a first portion in the photonic crystal that has a first refraction index;
a second portion in the photonic crystal that has a second refraction index lower than the first refraction index; and
a refraction-index-distributed type defect wave guide;
wherein a difference between an effective refraction index of the first portion and an effective refraction index of the second portion changes continuously along a wave guiding direction of the refraction-index-distributed type defect wave guide. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
-
-
2. An optical control element formed from a photonic crystal, said optical control element comprising:
-
a first portion in the photonic crystal that has a first refraction index;
a second portion in the photonic crystal that has a second refraction index lower than the first refraction index; and
a refraction-index-distributed type defect wave guide;
wherein a difference between the refraction index of the first portion and the refraction index of the second portion changes continuously along a wave guiding direction of the refraction-index-distributed type defect wave guide.
-
-
3. An optical control element formed from a photonic crystal, said optical control element comprising:
-
a first portion in the photonic crystal that has a first refraction index;
a second portion in the photonic crystal that has a second refraction index lower than the first refraction index; and
a refraction-index-distributed type defect wave guide;
wherein a difference between an effective refraction index of the first portion and an effective refraction index of the second portion changes stepwise along a wave guiding direction of the refraction-index-distributed type defect wave guide.
-
-
4. An optical control element formed from a photonic crystal, said optical control element comprising:
-
a first portion in the photonic crystal that has a first refraction index;
a second portion in the photonic crystal that has a second refraction index lower than the first refraction index; and
a refraction-index-distributed type defect wave guide;
wherein a difference between the refraction index of the first portion and the refraction index of the second portion changes stepwise along a wave guiding direction of the refraction-index-distributed type defect wave guide.
-
Specification