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We study the photon generation from vacuum via the Dynamical Casimir Effectin a cavity containing a N-level detector in equally-spaced resonant ladderconfiguration or N-1 identical resonant two-level atoms. If the modulationfrequency equals exactly twice the unperturbed cavity frequency, the photongrowth goes on steadily for odd N, while for even N at most N-2 photons can begenerated. This finding is corroborated by numerical calculations. In the limit$N\to\infty$ we obtain the harmonic oscillator model of the detector, whichadmits analytical results.

Dynamical Casimir Effect in cavity with N-level detector or N-1 two-level atoms