Plasmonic structured color filters for hyperspectral detection
The aspects of the disclosed embodiments are directed to a filter that includes a substrate, a dielectric layer disposed on the substrate in a pattern, leaving exposed portions of the substrate. A metallic layer is deposited over the dielectric layer and exposed portions of the substrate forming metallic structures over the exposed portions of the substrate and complementary metal patterns on the dielectric layer. A face of the filter is configured in a complimentary square checkerboard pattern, alternating between the metallic structures over the exposed portions of the substrate and complementary metal patterns on the dielectric layer. The filter is configured to operate when wavelengths of light impinge upon the checkerboard face of the filter and excite the metallic structures that are patterned atop the dielectric layer.
1 . A plasmonic filter comprising:
a substrate;
a dielectric layer disposed on the substrate as a continuous layer;
a metallic layer deposited over the dielectric layer in a checkerboard pattern forming a top array of metallic structures and in a complementary checkerboard pattern forming a bottom array of complementary metallic structures,
wherein the dielectric layer vertically separates the top array of metallic structures from the bottom array of complementary metallic structures.
2 . The plasmonic filter according to claim 1 , wherein the filter is configured to operate when wavelengths of light impinge upon the checkerboard pattern face of the filter and excite the top array of metallic structures.
3 . The plasmonic filter according to claim 2 , wherein horizontal transmission of light between the top array of metallic structures is reduced by plasmons generated by the excitation of the top array.
4 . The plasmonic filter according to claim 1 , wherein the substrate is a transparent substrate.
5 . The plasmonic filter according to claim 1 , wherein the plasmonic filter is directly deposited upon a hyperspectral detector.
6 . A method of forming a plasmonic filter, the method comprising:
depositing a substrate;
depositing a dielectric layer on the substrate in a continuous layer;
depositing a metallic layer over the dielectric layer in a checkerboard pattern forming a top array of metallic structures and in a complementary checkerboard pattern forming a bottom array of complementary metallic structures,
wherein the dielectric layer vertically separates the top array of metallic structures from the bottom array of complementary metallic structures.
7 . The method according to claim 6 , wherein the filter is configured to operate when wavelengths of light impinge upon the checkerboard pattern face of the filter and excite the top array of metallic structures.
8 . The method according to claim 6 , wherein the substrate is a transparent substrate.