WO/2009/011439 is referenced by 9 patents.

An optical filter that transmits light of the visible light region includes a dielectric substrate; a dielectric layer that is formed on a surface of the dielectric substrate; and a first metal structure group in which a plurality of first metal structures are arranged two-dimensionally in an isolated state in the in-plane direction of the dielectric substrate, that is provided between the dielectric substrate and the dielectric layer, comprising: the first metal structures having first and second lengths in first and second directions orthogonal to each other, which lengths are equal to or less than a first wavelength in the visible light region; and a transmittance of the first wavelength being reduced or a reflectance being increased by surface plasmons induced on a surface of the first metal structures by resonance between light incident on the dielectric substrate or the dielectric layer and the first metal structures.

Optical filter
Application Number
Publication Number
Application Date
July 14, 2008
Publication Date
January 22, 2009
Inao Yasuhisa
Ogino Masaya
Yamada Tomohiro
Inao Yasuhisa
Ogino Masaya
Yamada Tomohiro
Canon Kabushiki Kaisha
G02B 05/20
G02B 05/18
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