title: Three-pathway electromagnetically induced transparency in coupled-cavity optomechanical system.
abstract: Recently Qu and Agarwal [Phys. Rev. A 22, 031802 (2013)] found a three-pathway electromagnetically induced absorption (TEIA) phenomenon within a mechanically coupled two-cavity system, where there exist a sharp EIA dip in the broad electromagnetically induced transparency peak in the transmission spectrum. In this work, we study the response of a probe light in a pair of directly coupled microcavities with one mechanical mode. We find that in addition to the sharp TEIA dip within a broad EIT window as found by Qu and Agarwal, three-pathway electromagnetically induced transparency (TEIT) within the broad EIT window could also exist under certain conditions. We give explicit physical explanations and detailed calculations. Our results provide a method for controlling transition between TEIA and TEIT in coupled optomechanical systems, and reveal the multiple pathways interference is versatile for controlling light.
authors.forename: Fu-Chuan
authors.initials: FC
authors.lastname: Lei
authors.forename: Ming
authors.initials: M
authors.lastname: Gao
authors.forename: Chunguang
authors.initials: C
authors.lastname: Du
authors.forename: Qing-Li
authors.initials: QL
authors.lastname: Jing
authors.forename: Gui-Lu
authors.initials: GL
authors.lastname: Long