| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical device for efficiently generating a change in a refraction index while preventing a surface reflection of an incident light. <P>SOLUTION: An optical device 1 includes a substrate 2, plural columnar parts 3 arranged on a surface of the substrate 2 at a pitch P not longer than that of an incident light, a medium 6 filling gaps 5 between the columnar parts 3 and having a refraction index different from the columnar parts 3, and membranous parts 4 having a refraction index different from that of the columnar parts 3 and arranged at positions to cover an entire surface of an incident surface of light consisting of any one or more of surfaces of surfaces 2a of the substrate 2, end surfaces 3a of the columnar parts 3, or a surface of a medium 6. The membranous parts 4 have a membrane thickness exhibiting an anti-reflection function by an interferential action, and a volume ratio between the columnar parts 3 and the medium 6 changes in a direction along the surface of the substrate 2. <P>COPYRIGHT: (C)2012,JPO&INPIT |
