  We theoretically investigate the optical and mechanical properties of a
double cavity optomechanical system with one stationary and two harmonically
bound mirrors. We show that it is possible for the mechanical mirrors in this
system to posses negative effective mass. Working within the strong coupling
and the resolved sideband regime, we show that the displacement of the middle
resonator is multistable under certain constrains. We also point to the
existence of optomechanically induced absorption (OMIA) and Fano resonance.
Owing to the negative effective mass, our scheme can be exploited in the study
of quantum optomechanical metamaterials.
