title: Optomechanically-induced transparency in parity-time-symmetric microresonators.
abstract: Optomechanically-induced transparency (OMIT) and the associated slowing of light provide the basis for storing photons in nanoscale devices. Here we study OMIT in parity-time (PT)-symmetric microresonators with a tunable gain-to-loss ratio. This system features a sideband-reversed, non-amplifying transparency, i.e., an inverted-OMIT. When the gain-to-loss ratio is varied, the system exhibits a transition from a PT-symmetric phase to a broken-PT-symmetric phase. This PT-phase transition results in the reversal of the pump and gain dependence of the transmission rates. Moreover, we show that by tuning the pump power at a fixed gain-to-loss ratio, or the gain-to-loss ratio at a fixed pump power, one can switch from slow to fast light and vice versa. These findings provide new tools for controlling light propagation using nanofabricated phononic devices.
authors.affiliation: 1] The Key Laboratory of Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Science, Shanghai 201800,China [2] CEMS, RIKEN, Saitama, 351-0198, Japan [3] Department of Physics, Henan Normal University, Xinxiang 453007, China.
authors.forename: H
authors.initials: H
authors.lastname: Jing
authors.affiliation: Electrical and Systems Engineering, Washington University, St. Louis, Missouri 63130, U.S.A.
authors.forename: Şahin K
authors.initials: ŞK
authors.lastname: Özdemir
authors.affiliation: Department of Physics, Henan Normal University, Xinxiang 453007, China.
authors.forename: Z
authors.initials: Z
authors.lastname: Geng
authors.affiliation: Department of Automation, Tsinghua University, Beijing 100084, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Zhang
authors.affiliation: 1] CEMS, RIKEN, Saitama, 351-0198, Japan [2] School of physics, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Xin-You
authors.initials: XY
authors.lastname: Lü
authors.affiliation: Electrical and Systems Engineering, Washington University, St. Louis, Missouri 63130, U.S.A.
authors.forename: Bo
authors.initials: B
authors.lastname: Peng
authors.affiliation: Electrical and Systems Engineering, Washington University, St. Louis, Missouri 63130, U.S.A.
authors.forename: Lan
authors.initials: L
authors.lastname: Yang
authors.affiliation: 1] Electrical and Systems Engineering, Washington University, St. Louis, Missouri 63130, U.S.A. [2] Physics Department, The University of Michigan, Ann Arbor, MI 48109-1040, U.S.A.
authors.forename: Franco
authors.initials: F
authors.lastname: Nori