  We demonstrate the existence of the phenomenon of the inverse
electromagnetically induced transparency (IEIT) in an opto mechanical system
consisting of a nanomechanical mirror placed in an optical cavity. We show that
two weak counter-propagating identical classical probe fields can be completely
absorbed by the system in the presence of a strong coupling field so that the
output probe fields are zero. The light is completely confined inside the
cavity and the energy of the incoming probe fields is shared between the cavity
field and creation of a coherent phonon and resides primarily in one of the
polariton modes. The energy can be extracted by a perturbation of the external
fields or by suddenly changing the $Q$ of the cavity.
