Patent ID: 9715047
Date: 2017-07-25
CPC Classifications: G02B,Y10T

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 n the high index material has an index of refraction n 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 where λ long TE a first band edge for a first long wavelength in the transverse electric mode and λ short TE is a second band edge for a first short wavelength in the transverse electric mode, and the range to mid-range ratio for the transverse magnetic mode is determined by where λ long TM is a third band edge for a second long wavelength in the transverse magnetic mode and λ short TM is a fourth band edge for a second short wavelength in the transverse magnetic mode.