Abstract

We propose a scheme to investigate the perfect photon absorption in a hybrid atom-optomechanical system under and beyond the low-excitation limit. The perfect photon absorption is present in both cases and always accompanied by the optical bistability or multistability. We find that the coupling with the atomic ensemble provides the sufficient and necessary condition for the perfect photon absorption in such a system, but the optomechanical coupling is only a necessary condition for the bistability (in the low-excitation regime)/multistability (beyond the low-excitation limit). It is especially interesting that the optical nonlinearities induced by the nonlinear optomechanical interaction and nonlinear atomic excitation can be overlap-added, which results in the optical multistability and further causes an additional perfect photon absorption point.

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