| 摘要 |
A polarization element includes: a base; a plurality of metal thin wires provided on the base along a predetermined alignment axis; and a plurality of protection films covering each of the plurality of metal thin wires. In the element, each of the protection films covers an upper end and both sidewalls of one of the metal thin wires. Further, a width of a part, which is on the upper end of the one of the metal thin wires, of the each of the protection films in a direction of the alignment axis is larger than a width obtained by summing a width of the one of the metal thin wires in the direction of the alignment axis and widths of parts, which are on the both sidewalls of the one of the metal thin wires, of the each of the protection films in the direction of the alignment axis. The protection films on sidewalls, which are opposed to each other, of the metal thin wires that are adjacent form an air gap.
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