Patent ID: 8736959

Claim:
An omnidirectional reflector comprising: a multilayer stack having a plurality of layers of high index of refraction material H1, H2, H3 . . . Hn and a plurality of layers of low index of refraction material L1, L2, L3 . . . Lm, said plurality of layers of high index of refraction material and plurality of layers of low index of refraction material alternately stacked on top of each other; said plurality of layers of high index of refraction material and plurality of layers of low index of refraction material each having a predefined thickness of d H1 , d H2 , d H3 . . . d Hn and d L1 , d L2 , d L3 . . . d Lm , respectively, and said d H1 thickness not generally equal to said d H2 , d H3 . . . or d Hn thickness and said d L1 thickness not generally equal to said d L2 , d L3 . . . or d Lm thickness such that said multilayer stack has a non-periodic layered structure; and said multilayer stack defining a reflector having a single reflection band with a center wavelength in the visible spectrum, said single reflection band being a reflectance greater than 60% of said center wavelength of a narrow band of electromagnetic radiation, said single reflection band also having a full width at half maximum (FWHM) of less than 200 nanometers and a shift of said center wavelength of less than 75 nanometers when said reflector is viewed from angles between 0 degrees and 45 degrees.