Non-dichroic omnidirectional structural color
First Claim
1. A non-dichroic omnidirectional structural color comprising:
- a multilayer stack having an absorbing layer, a first layer made from a first material having a first index of refraction and a first predefined thickness extending across said absorbing layer, and a second layer made from a second material having a second index of refraction and a second predefined thickness extending across said first layer;
said absorbing layer is selected from the group consisting of chromium, nickel, carbon, graphite, graphene, titanium, vanadium, aluminum, cobalt, silver, molybdenum, niobium, iron, steel, tungsten and alloys thereof;
said multilayer stack reflecting a single narrow band of visible electromagnetic radiation having a reflectance between 65-80% of incident light waves, a width of less than 200 nanometers and a center wavelength shift of less than 50 nanometers when viewed from angles between 0 and 45 degrees and exposed to a source of broadband electromagnetic radiation.
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Abstract
A non-dichroic omnidirectional structural color multilayer structure. The non-dichroic omnidirectional structural color multilayer structure has an absorbing layer, a first layer extending across the absorbing layer, and a second layer extending across the first layer. The multilayer structure can reflect a narrow band of electromagnetic radiation that has a width of less than 500 nanometers and a center wavelength shift of less than 200 nanometers when the multilayer structure is viewed from angles between 0 and 45 degrees. In addition, the absorbing layer can block electromagnetic radiation reflected off of a surface that is proximate to the multilayer structure and thereby afford for a “pure” color that is not contaminated by reflected light from surrounding surfaces.
214 Citations
15 Claims
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1. A non-dichroic omnidirectional structural color comprising:
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a multilayer stack having an absorbing layer, a first layer made from a first material having a first index of refraction and a first predefined thickness extending across said absorbing layer, and a second layer made from a second material having a second index of refraction and a second predefined thickness extending across said first layer; said absorbing layer is selected from the group consisting of chromium, nickel, carbon, graphite, graphene, titanium, vanadium, aluminum, cobalt, silver, molybdenum, niobium, iron, steel, tungsten and alloys thereof; said multilayer stack reflecting a single narrow band of visible electromagnetic radiation having a reflectance between 65-80% of incident light waves, a width of less than 200 nanometers and a center wavelength shift of less than 50 nanometers when viewed from angles between 0 and 45 degrees and exposed to a source of broadband electromagnetic radiation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A process for producing a non-dichroic omnidirectional structural color paint pigment, the process comprising;
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providing an absorbing layer, the absorbing layer being selected from the group consisting of chromium, nickel, carbon, graphite, graphene, titanium, vanadium, aluminum, cobalt, silver, molybdenum, niobium, iron, steel, tungsten and alloys thereof; providing a first layer extending over the absorbing layer, the first layer having a first thickness and a first index of refraction; providing a second layer extending over the first layer, the second layer having a second thickness and a second index of refraction, the absorbing layer, first layer and second layer reflecting a single narrow band of visible electromagnetic radiation having a reflectance of between 65-80% of incident light waves, a width of less than 200 nanometers and a center wavelength shift of less than 50 nanometers when viewed from angles between 0 and 45 degrees and exposed to a source of broadband electromagnetic radiation. - View Dependent Claims (14, 15)
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Specification