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 isolat
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.
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1. An optical filter that transmits or reflects light of a first wavelength, a transmittance of the first wavelength being made minimal or a reflectance of the first wavelength being made maximal by localized plasmons induced on a metal, the optical filter comprising: a substrate; anda first metal s
1. An optical filter that transmits or reflects light of a first wavelength, a transmittance of the first wavelength being made minimal or a reflectance of the first wavelength being made maximal by localized plasmons induced on a metal, the optical filter comprising: a substrate; anda 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 a dielectric surface of the substrate, that is provided on the dielectric surface of the substrate,wherein the first metal structures have a first length in a first direction and a second length in a second direction orthogonal to the first direction, the first length and the second length being less than or equal to the first wavelength. 2. The optical filter according to claim 1, wherein a period at which the first metal structures in the first metal structure group are arranged is less than or equal to the first wavelength. 3. The optical filter according to claim 1, wherein the first length and the second length are the same. 4. The optical filter according to claim 3, wherein the first metal structures are in a square shape. 5. The optical filter according to claim 1, wherein a thickness of the first metal structures is less than or equal to the first wavelength. 6. The optical filter according to claim 1, wherein the first metal structures consist of aluminium, or an alloy or a mixture including aluminium. 7. The optical filter according to claim 1, wherein a dielectric constant of the dielectric surface of the substrate and a dielectric constant of a dielectric layer of the optical filter are the same. 8. The optical filter according to claim 1, wherein the dielectric surface of the substrate is comprised of any one selected from the group consisting of silicon dioxide, titanium dioxide, and silicon nitride. 9. The optical filter according to claim 1, wherein the first length and the second length are within a range of 110 nm or more and 160 nm or less, a thickness of the first metal structures is within a range of 10 nm or more and 100 nm or less, a period at which the first metal structures are arranged is within a range of 340 nm or more and 450 nm or less, and the first wavelength is within a range of 550 nm or more and less than 650 nm. 10. The optical filter according to claim 1, wherein the first length and the second length are within a range of 90 nm or more and less than 130 nm, a thickness of the first metal structures is within a range of 10 nm or more and 100 nm or less, a period at which the first metal structures are arranged is within a range of 260 nm or more and 340 nm or less, and the first wavelength is within a range of 450 nm or more and less than 550 nm. 11. The optical filter according to claim 1, wherein the first length and the second length are within a range of 60 nm or more and less than 100 nm, a thickness of the first metal structures is within a range of 10 nm or more and 100 nm or less, a period at which the first metal structures are arranged is within a range of 180 nm or more and 280 nm or less, and the first wavelength is within a range of 350 nm or more and less than 450 nm. 12. The optical filter according to claim 1, wherein the optical filter comprises two or more of the first metal structure groups in an in-plane direction of the dielectric surface of the substrate, and wherein periods at which the first metal structures comprising the two or more first metal structure groups are arranged are different from each other, and the two or more first metal structure groups are arranged in different regions of the dielectric surface of the substrate. 13. The optical filter according to claim 1, further comprising, in addition to the first metal structure group, a second metal structure group in which a plurality of second metal structures are arranged two-dimensionally in an isolated state in an in-plane direction of the dielectric surface of the substrate, wherein the second metal structures have a third length in the first direction and a fourth length in the second direction, and the third length and the fourth length are less than or equal to a second wavelength different from the first wavelength,wherein the third length is different from the first length, or the fourth length is different from the second length,wherein the first metal structure group and the second metal structure group are arranged in different regions of the dielectric surface of the substrate, andwherein a transmittance of the second wavelength is made minimal or a reflectance of the second wavelength is made maximal by localized surface plasmons induced on a surface of the second metal structures. 14. The optical filter according to claim 1, wherein the optical filter comprises two or more of the first metal structure groups in an in-plane direction of the dielectric surface of the substrate, and wherein the two or more first metal structure groups are arranged in overlapping regions. 15. The optical filter according to claim 1, wherein the optical filter comprises two or more of the first metal structure groups in an in-plane direction of the dielectric surface of the substrate, wherein periods at which the first metal structures comprising the two or more first metal structure groups are arranged are different from each other, andwherein the two or more first metal structure groups are arranged in overlapping regions. 16. A light-detecting device comprising a photoelectric converting portion, an electron circuit, and the optical filter according to claim 1. 17. An image capturing device comprising a pixel area, a scanning circuit, and the light-detecting device according to claim 16. 18. A camera comprising a lens, a recording medium and the image capturing device according to claim 17. 19. The optical filter according to claim 1, wherein the optical filter further comprising a dielectric layer with which the first metal structure group is covered. 20. The optical filter according to claim 19, wherein a distance from the surface of the dielectric layer to the surface of the first metal structures is less than or equal to a value d expressed by the following formula: d=λres22nΔλFW in which λres denotes a plasmon resonance wavelength of the first metal structures, n denotes a refractive index of the dielectric layer, and λλFW denotes a full width at half maximum of a resonance spectrum of the first metal structure. 21. The optical filter according to claim 20, wherein a distance from the surface of the dielectric layer to the surface of the first metal structures is less than or equal to a value d expressed by the following formula: d=λres-ΔλHW2n in which λres denotes a plasmon resonance wavelength of the first metal structures, n denotes a refractive index of the dielectric layer, and ΔλHW denotes a half width at half maximum of a resonance spectrum of the first metal structure.
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이 특허에 인용된 특허 (6)
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