Patent ID: 7697810
Filing Date: 2010-04-13
Classification: B82Y,G02B

Abstract:
1. A three-dimensional photonic crystal comprising a structure made of a first medium and a second medium having a refractive index lower than that of the first medium, which are periodically arranged in a three-dimensional direction, wherein the structure has a first layer, a second layer, a third layer, and a fourth layer arranged in this order, the structure in each of the first and third layers extending in a first direction, and the structure in each of the second and fourth layers extending in a second direction, wherein the structure of each layer includes a flat surface as one end surface in a stacking direction of the first layer to the fourth layer, and a first structural portion, a second structural portion, and a third structural portion that are periodically arranged in an extending direction of the structure, the first structural portion having a first width along the flat surface and a first height from the flat surface, the second structural portion having a second width larger than the first width and a second height larger than the first height, and the third structural portion having a width and a height that continuously or stepwise change in the extending direction of the structure, and wherein the flat surface of the first structural portion of one of two adjacent layers in the first layer to the fourth layer contacts a surface opposite to the flat surface of the second structural portion of the other of the two adjacent layers.