1-Dimensional (1D) photonics crystals with and without defects have been numerically studied using efficient Transfer Matrix Method (TMM). Detailed numerical recipe of the TMM has been laid out. Dispersion relation is verified for the periodic Photonics Band Gap (PBG) structure. When there are defects, the transmission spectrum can be decomposed into one or more quasi modes with excellent agreement. The Density of States (DOS) is obtained from the phase derivative of the transmission spectrum. Greens function is also obtained showing much sharper mode characteristics when the excitation source is localized at the peaks of the quasi modes.
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