Spectrum filtering for visual displays and imaging having minimal angle dependence
First Claim
1. An optical spectrum filtering device comprising:
- an interference filter assembly comprising a dielectric material having a refractive index of greater than about 1.5 disposed between a pair of parallel reflective surfaces;
wherein the filter assembly is capable of transmitting a portion of an electromagnetic spectrum to generate a filtered output having a predetermined range of wavelengths that displays minimal angle dependence so that the predetermined range of wavelengths varies less than or equal to about 50 nm from an incidence angle of 0 to an incidence angle of 90°
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Accused Products
Abstract
An optical spectrum filtering device, e.g., color filter, having reduced angle dependence is provided that comprises an interference filter assembly comprising a high refractive index dielectric material, such as a Fabry-Perot based resonator structure. The filter assembly is capable of transmitting a portion of an electromagnetic spectrum into the dielectric material to generate a filtered output with a predetermined range of wavelengths that displays minimal angle dependence, when viewed from a range of incidence angles ranging from normal (0°) to 90°. Methods of making minimal angle dependent optical spectrum filters and reducing angle dependence for such devices are also provided.
49 Citations
24 Claims
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1. An optical spectrum filtering device comprising:
an interference filter assembly comprising a dielectric material having a refractive index of greater than about 1.5 disposed between a pair of parallel reflective surfaces;
wherein the filter assembly is capable of transmitting a portion of an electromagnetic spectrum to generate a filtered output having a predetermined range of wavelengths that displays minimal angle dependence so that the predetermined range of wavelengths varies less than or equal to about 50 nm from an incidence angle of 0 to an incidence angle of 90°
.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An optical spectrum filtering device comprising:
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an interference filter assembly comprising an optical metamaterial having a refractive index of greater than about 2 disposed between a pair of parallel reflective surfaces, wherein each reflective surface comprises a metal and the optical metamaterial comprises a metallic grating structure comprising a plurality of subwavelength slits having a dielectric material embedded in the subwavelength slits; and wherein the filter assembly is capable of transmitting a portion of an electromagnetic spectrum into the dielectric material to generate a filtered output having a predetermined range of wavelengths that exits the filter assembly, wherein the filtered output has a predetermined range of wavelengths and displays minimal angle dependence so that the predetermined range of wavelengths varies less than or equal to about 50 nm from an incidence angle of 0 to an incidence angle of 90°
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19. An optical spectrum filtering device comprising:
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an interference filter assembly comprising a high refractive index dielectric material disposed between a pair of parallel reflective surfaces, wherein each reflective surface comprises a distributed Bragg Reflector (DBR) or a 1-dimensional photonic crystal; and wherein the filter assembly is capable of transmitting a portion of an electromagnetic spectrum into the dielectric material to generate a filtered output having a predetermined range of wavelengths that exits the filter assembly, wherein the filtered output has a predetermined range of wavelengths and displays minimal angle dependence so that the predetermined range of wavelengths varies less than or equal to about 50 nm from an incidence angle of 0 to an incidence angle of 90°
. - View Dependent Claims (20)
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21. A method of making an optical spectrum filtering device having minimal angle dependence, the method comprising:
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applying a polymeric resist material to a dielectric material having a refractive index of greater than about 2 and contacting the polymeric resist with a mold having a predetermined height; etching the polymeric resist and dielectric material; and applying a metal over the remaining dielectric material to form an interference filter assembly having the refractive index of greater than about 2 comprising a pair of parallel reflective surfaces, wherein a filtered output from the interference filter assembly generates a predetermined range of wavelengths that displays minimal angle dependence so that the predetermined range of wavelengths varies less than or equal to about 50 nm from an incidence angle of 0 to an incidence angle of 90°
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22. A method of reducing angle dependence of an optical spectrum filtering device, the method comprising:
incorporating a dielectric material having a refractive index of greater than about 1.5 into an interference filter assembly comprising a pair of parallel reflective surfaces, wherein each reflective surface comprises a metal;
so that the filter assembly generates a filtered output having a predetermined range of wavelengths that deviates less than or equal to 50 nm when the filter assembly is observed from incidence angles ranging from 0 to 90°
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23. An optical spectrum filtering device comprising:
a resonance filter assembly that displays minimal angle dependence comprising a resonator structure comprising an electrically conductive metal grating structure that forms an optical metamaterial, wherein the electrically conductive metal grating structure comprises at least two openings capable of transmitting a portion of an electromagnetic spectrum to generate a filtered and polarized output having a predetermined range of wavelengths via optical resonance, wherein the predetermined range of wavelengths varies less than or equal to about 50 nm from an incidence angle of 0 to an incidence angle of 90°
.- View Dependent Claims (24)
Specification