Multi-layer photonic structures having omni-directional reflectivity and coatings incorporating the same
First Claim
1. A multi-layer photonic structure comprising alternating layers of high index material and low index material having a form [0.5 L H (LH)N 0.5 L] where H is a layer of high index material, L is a layer of low index material, 0.5 L are half layers of low index dielectric material positioned on a top and a bottom of the multilayer photonic structure, and N is a number of pairs of layers of high index material and layers of low index material, wherein:
- N is an integer≧
1;
the low index dielectric material has an index of refraction nL from about 1.3 to about 2.5;
the high index dielectric material has an index of refraction nH of greater than or equal to about 3.0, wherein nH>
nL, and the half layers of low index dielectric material pass visible wavelengths of light and reflect UV and IR wavelengths of light such that the multilayer photonic structure is substantially transparent to visible wavelengths of light and has an IR reflectivity band and a UV reflectivity band, wherein a reflectance of the multilayer photonic structure is about 100% within the IR reflectivity band and within the UV reflectivity band for light having angles of incidence from about 0 degrees to about 80 degrees relative to the multi-layer photonic structure; and
the multi-layer photonic structure has a range to mid-range ratio greater than about 20% in a transverse electric mode and a transverse magnetic mode, and wherein the range to mid-range ratio for the transverse electric mode is determined by
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Abstract
A multi-layer photonic structure may include alternating layers of high index material and low index material having a form [H(LH)N] where, H is a layer of high index material, L is a layer of low index material and N is a number of pairs of layers of high index material and layers of low index material. N may be an integer ≧1. The low index dielectric material may have an index of refraction nL from about 1.3 to about 2.5. The high index dielectric material may have an index of refraction nH from about 1.8 to about 3.5, wherein nH>nL and the multi-layer photonic structure comprises a reflectivity band of greater than about 200 nm for light having angles of incidence from about 0 degrees to about 80 degrees relative to the multi-layer photonic structure. The multi-layer photonic structure may be incorporated into a paint or coating system thereby forming an omni-directional reflective paint or coating.
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Citations
19 Claims
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1. A multi-layer photonic structure comprising alternating layers of high index material and low index material having a form [0.5 L H (LH)N 0.5 L] where H is a layer of high index material, L is a layer of low index material, 0.5 L are half layers of low index dielectric material positioned on a top and a bottom of the multilayer photonic structure, and N is a number of pairs of layers of high index material and layers of low index material, wherein:
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N is an integer≧
1;the low index dielectric material has an index of refraction nL from about 1.3 to about 2.5; the high index dielectric material has an index of refraction nH of greater than or equal to about 3.0, wherein nH>
nL, and the half layers of low index dielectric material pass visible wavelengths of light and reflect UV and IR wavelengths of light such that the multilayer photonic structure is substantially transparent to visible wavelengths of light and has an IR reflectivity band and a UV reflectivity band, wherein a reflectance of the multilayer photonic structure is about 100% within the IR reflectivity band and within the UV reflectivity band for light having angles of incidence from about 0 degrees to about 80 degrees relative to the multi-layer photonic structure; andthe multi-layer photonic structure has a range to mid-range ratio greater than about 20% in a transverse electric mode and a transverse magnetic mode, and wherein the range to mid-range ratio for the transverse electric mode is determined by - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A UV-IR reflective multilayer photonic structure comprising layers of high index material and low index material having a form [0.5 L H (LH)N 0.5 L] where H is a layer of high index dielectric material, L is a layer of the low index dielectric material, 0.5 L are half layers of low index dielectric material positioned on a top and a bottom of the multilayer photonic structure, and N is the number pairs of layers of high index material and layers of low index materials, wherein:
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N is an integer≧
1;the low index dielectric material has an index of refraction nL from about 1.3 to about 2.5; the high index dielectric material has an index of refraction nH of greater than or equal to about 3.0 , wherein nH>
nL and, for angles of incidence from about 0 degrees to about 80 degrees, the half layers of low index dielectric material reflect wavelengths of light in an infrared spectrum and an ultraviolet spectrum such that the multi-layer photonic structure comprises a reflectivity band greater than about 300 nm for light in the infrared spectrum, a reflectivity band greater than about 50 nm for light in the ultraviolet spectrum, and the half layers of low index dielectric material pass wavelengths of light in a visible spectrum such that the multi-layer photonic structure is substantially transparent to visible light for angles of incidence from about 0 degrees to about 15degrees; andthe multi-layer photonic structure has a range to mid-range ratio greater than about 20% in a transverse electric mode and a transverse magnetic mode, and wherein the range to mid-range ratio for the transverse electric mode is determined by - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An article of manufacture comprising a broadband omni-directionally reflective coating with at least one reflectivity band comprising a bandwidth greater than about 250 nm for angles of light incident on the coating from about 0°
- to about 80°
, the coating comprising;a binder and a plurality of multi-layer photonic structures dispersed in the binder, wherein the multi-layer photonic structures have a range to mid-range value in a transverse electric mode and a transverse magnetic mode from about 20% to about 50% and at least one reflectivity band having a bandwidth greater than about 250 nm for angles of light incident on the multilayer photonic structure from about 0°
to at least about 45°
, wherein the multilayer photonic structure comprises layers of high index material and low index material having a form [0.5 L H(LH)N 0.5 L] where H is a layer of high index dielectric material, L is a layer of the low index dielectric material, N is the number of pairs of layers of high index material and layers of low index materials, 0.5 L are half layers of low index dielectric material positioned on a top and a bottom of the multilayer photonic structure, wherein;N is an integer≧
1;the low index dielectric material has an index of refraction nL from about 1.3 to about 2.5; the high index dielectric material has an index of refraction nH of greater than or equal to about 3.0 and nH >
nL;the half layers of low index dielectric material pass wavelengths of light in a visible spectrum and reflect wavelengths of light in an infrared spectrum and an ultraviolet spectrum such that the at least one reflectivity band comprises a first reflectivity band having a bandwidth greater than about 300 nm for light in the infrared spectrum, a second reflectivity band greater than about 50 nm for light in the ultraviolet spectrum, and the multi-layer photonic structure is substantially transparent to visible light; and the range to mid-range ratio for the transverse electric mode is determined by - View Dependent Claims (18, 19)
- to about 80°
Specification