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Normal-mode splitting is the most evident signature of strong coupling between two interacting subsystems. It occurs when two subsystems exchange energy between themselves faster than they dissipate it to the environment. Here we experimentally show that a weakly coupled optomechanical system at room temperature can manifest normal-mode splitting when the pump field fluctuations are antisquashed by a phase-sensitive feedback loop operating close to its instability threshold. Under these conditions the optical cavity exhibits an effectively reduced decay rate, so that the system is effectively promoted to the strong coupling regime.

Original languageEnglish
Article number073601
Pages (from-to)1-5
Number of pages5
JournalPhysical Review Letters
Volume120
Issue number7
DOIs
Publication statusPublished - 2018

ID: 44903552