We design, optimize, fabricate, and characterize highly reflective quasi-omnidirectional multilayered structures with a wide angular and spectral range. We consider chirped structures with layers of gradually varying thicknesses and structures made by stacking Bragg-type sub-structures, and we maximized their numerically calculated reflectance averaged over different spectral ranges keeping a minimum thickness for given pairs of refractive indices. We fabricated some of these structures with porous silicon with a low refractive contrast between adjacent layers, and compared their measured optical properties to the theoretical results and to previous works. We obtained relatively thin quasi-omnidirectional mirrors with wide bands over different wavelength ranges that compare favorably to others reported in the literature.

我们设计、优化、制造和表征具有宽角度和光谱范围的高反射准全向多层结构。我们考虑具有逐渐变化的厚度层的啁啾结构和通过堆叠布拉格型子结构制成的结构，并且我们最大化它们在不同光谱范围内平均的数值计算反射率，对于给定的折射率对保持最小厚度。我们用相邻层之间具有低折射对比度的多孔硅制造了其中一些结构，并将其测量的光学特性与理论结果和以前的工作进行了比较。我们获得了相对较薄的准全向反射镜，在不同波长范围内具有宽带，与文献中报道的其他反射镜相比具有优势。