Figure 9.

(a) Projected photonic band structure of a 1D PhC made of PS (n₁ = 1.6) and tellurium (n₂ = 4.6) layers with a thicknesses ratio of d₁/d₂ = 2. The red lines are the light lines having a slope corresponding to the speed of light in air. Reproduced with permission.¹⁸³ Copyright 1998, American Association for the Advancement of Science. (b) 2D plot of calculated reflectance spectra of a PhC consisting of 10 pairs of PS and tellurium layers with thicknesses of 1.0 μm and 0.5 μm, respectively for TE- and TM-polarizations as a function of the incident angle from air. The grey scale indicates the value of the reflectivity (white = 100% reflection). The relatively low reflectivity of TM-polarized light for incident angles ranging from 60 to 80° is due to the Brewster angle effect. (c) Reflectance spectra of 20 pairs of dielectric layers calculated by transfer matrix method as a function of refractive index ratios with a fixed thickness of 100 nm for each layer. (d) The peak reflectivity vs. the ratio between high and low refractive indices is plotted for several different numbers of pairs of high and low refractive index layers.