The future of optical devices involves manipulation of nanoscale structure. Thus, novel samples that incorporate both photonic crystal (PC) structure and metamaterial properties, known as PC metamaterials, are proposed. First, metamaterials with no PC structure are fabricated as nanorod or nanohelical structures and characterized to extract their optical constants. Then, a computational model for the metamaterial within a PC structure was developed to calculate the photonic bandgap (PBG). These results show that a large PBG with the desired directionality can be achieved with these PC metamaterials.
The BRDF describes optical scatter off realistic surfaces. The microfacet BRDF model assumes geometric optics but is computationally simple compared to wave optics models. In this work, MERL BRDF data is fitted to the original Cook-Torrance microfacet model, and a modified Cook-Torrance model using the polarization factor in place of the mathematically problematic cross section conversion and geometric attenuation terms. The results provide experimental evidence that this modified Cook-Torrance model leads to improved fits, particularly for large incident and scattered angles. These results are expected to lead to more accurate BRDF modeling for remote sensing.