Theoretical (dashed line) and experimental (solid line) reflectivity spectra. (a) Sinusoidal, (b) Gaussian, and (c) Bragg refractive index profiles at 8°. The corresponding reflectivity spectra at 68° are shown in panels (d), (e), and (f), respectively. The intersection of the PBG between 8° and 68° is shown as a gray band. The nmin and nmax were 1.2 and 2.4, respectively, and the total physical thickness was 7,760 nm for each structure. The inset image shows an optical microscopy surface zone for (a) sinusoidal (b) Gaussian and (c) Bragg profiles. The scale bar corresponds to 200 μm.
Ariza-Flores et al. Nanoscale Research Letters 2012 7:391 doi:10.1186/1556-276X-7-391