This Master Thesis is dedicated to photonic crystal, in particular to macroporous silicon. We introduce the concepts of crystallography, and symmetry, and important associated tools to its study, the Reciprocal lattice, and the Brillouin Zone. We also give a brief explanation of anodic macropore formation in silicon; the method used in-site to produce photonic crystals. It follows a section explaining Fourier Transform spectrometry, and how it was used in the present work. Following it, we introduce our main software tools, which we have learned and used extensively throughout the development of this Thesis. We go into certain detail, to point some important aspects, or simply to provide a quick use guide. We finally present the results of our measures and simulations, the comparisons made and the conclusion that we can extract from our experiments.