OPTICAL ELEMENT, IMAGE SENSOR INCLUDING THE OPTICAL ELEMENT, AND IMAGE PICKUP APPARATUS INCLUDING THE IMAGE SENSOR

摘要

An optical element (501) includes a plurality of optical filters having different characteristics. The element includes a first optical filter (505) including a first metal structure group (503) including first metal structures periodically arranged in an in-plane direction of a substrate (502) surface and a second optical filter (506) including a second metal structure group (504) including second metal structures periodically arranged in the in-plane direction, the second metal structure group exhibiting a plasmon resonance condition different from that of the first metal structure group. The optical distance (507) between the first metal structures adjacent to each other is in a range of 0.75 to 1.25 times the optical distance (507) between the second metal structures adjacent to each other.