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 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 material has an index of refraction nL from about 1.3 to about 2.5;
the high index material has an index of refraction nH of greater than or equal to about 3.0;
the multilayer photonic structure is substantially transparent to visible wavelengths of light and has an IR reflectivity band and a UV reflectivity band; 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
20 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 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 material has an index of refraction nL from about 1.3 to about 2.5; the high index material has an index of refraction nH of greater than or equal to about 3.0; the multilayer photonic structure is substantially transparent to visible wavelengths of light and has an IR reflectivity band and a UV reflectivity band; 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 - 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 material, L is a layer of the low index material, 0.5 L are half layers of low index 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 material has an index of refraction nL from about 1.3 to about 2.5; the high index material has an index of refraction nH of greater than or equal to about 3.0; the multi-layer photonic structure comprises a reflectivity band for light in the infrared spectrum and a reflectivity band for light in the ultraviolet spectrum; 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 - 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 substantially transparent to visible light and having a first reflectivity band having a bandwidth for light in the infrared spectrum and a second reflectivity band for light in the ultraviolet spectrum, the coating comprising:
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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%, 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 material, L is a layer of the low index 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 material positioned on a top and a bottom of the multilayer photonic structure, wherein; N is an integer≧
1;the low index material has an index of refraction nL from about 1.3 to about 2.5; the high index material has an index of refraction nH of greater than or equal to about 3.0; and the range to mid-range ratio for the transverse electric mode is determined by - View Dependent Claims (18, 19, 20)
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Specification