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In this paper, we use the 'Quasi Normal Modes' (QNM) approach for discussingthe transmission properties of double-side opened optical cavities: inparticular, this approach is specified for one dimensional (1D) 'Photonic BandGap' (PBG) structures. Moreover, we conjecture that the density of the modes(DOM) is a dynamical variable which has the flexibility of varying with respectto the boundary conditions as well as the initial conditions; in fact, the e.m.field generated by two monochromatic counter-propagating pump waves leads tointerference effects inside a quarter-wave (QW) symmetric 1D-PBG structure.Finally, here, for the first time, a large number of theoretical assumptions onQNM metrics for an open cavity, never discussed in literature, are proved, anda simple and direct method to calculate the QNM norm for a 1D-PBG structure isreported.

Quasi Normal Modes description of transmission properties for Photonic Band Gap structures