Patent ID: 7054056
Filing Date: 2006-05-30
Classification: B82Y,G02B

Abstract:
1. A photonic crystal forming an optical element, said photonic crystal comprising: a plurality of substances which have different refractive indices and which are arranged to form a periodic structure having a fixed period length along an axis of the photonic crystal; wherein a constituent ratio of the substances at each period of the periodic structure is different from a constituent ratio of the substances at a previous period, such that a constituent ratio of the substances gradually changes along the axis of the photonic crystal, so that anomalous refraction of incident light, which is made up of light having a plurality of different wavelengths, traveling through the photonic crystal occurs at different positions on the axis in the photonic crystal based on the different wavelengths of the incident light, and so that a direction of advance of the incident light in the photonic crystal is different for the different wavelengths of the incident light.