Patent ID: 7903339

Claim:
An omnidirectional reflector comprising: alternating first and second layers, said first layer of a first material having a first predefined thickness with an outer surface and a refractive index between 2 and 4; and said second layer of a second material having a second predefined thickness with an outer surface and a refractive index between 1 and 3, said outer surface of said second layer extending across said outer surface of said first layer, said first layer in direct contact with and extending across said second layer; wherein said first layer and said second layer have a refractive index contrast between 0.2 and 1.0; said first predefined thickness, said second predefined thickness and said refractive index contrast between 0.2 and 1.0 providing a multilayer stack having a reflection band of less than 200 nanometers when viewed from angles between 0 degrees and 80 degrees; said multilayer stack having more than three layers.