Non-color shifting multilayer structures
First Claim
1. An omnidirectional structural color multilayer thin film comprising:
- a multilayer stack having a reflector layer, a dielectric layer extending over said reflector layer, an absorber layer extending over said dielectric layer and an outer dielectric layer extending over the absorber layer, said outer dielectric layer made from a dielectric material selected from the group consisting of ZnS and MgF2;
said multilayer stack reflecting a band of visible electromagnetic radiation having a predetermined full width at half maximum (FWHM) of less than 200 nm and a predetermined color shift in the form of a hue shift of less than 30°
on an a*b* color map when said multilayer stack is exposed to broadband electromagnetic radiation and viewed from angles between 0 and 45°
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Abstract
An omnidirectional multilayer thin film is provided. The multilayer thin film includes a multilayer stack having a first layer of a first material and a second layer of a second material, the second layer extending across the first layer. The multilayer stack reflects a narrow band of electromagnetic radiation having a full width at half maximum (FWHM) of less than 300 nanometers (nm) and a color/hue shift of less than 30 degrees when the multilayer stack is exposed to broadband electromagnetic radiation and viewed from angles between 0 and 45 degrees. In some instances, the multilayer stack has a total thickness of less than 2 microns (μm). Preferably, the multilayer thin film has a total thickness of less than 1.5 μm and more preferably less than 1.0 μm.
199 Citations
20 Claims
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1. An omnidirectional structural color multilayer thin film comprising:
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a multilayer stack having a reflector layer, a dielectric layer extending over said reflector layer, an absorber layer extending over said dielectric layer and an outer dielectric layer extending over the absorber layer, said outer dielectric layer made from a dielectric material selected from the group consisting of ZnS and MgF2; said multilayer stack reflecting a band of visible electromagnetic radiation having a predetermined full width at half maximum (FWHM) of less than 200 nm and a predetermined color shift in the form of a hue shift of less than 30°
on an a*b* color map when said multilayer stack is exposed to broadband electromagnetic radiation and viewed from angles between 0 and 45°
. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification