Normal-Mode Splitting in a Weakly Coupled Optomechanical System
Massimiliano Rossi (University of Camerino)
Nenad Kralj (University of Camerino)
Stefano Zippilli (University of Camerino, Istituto Nazionale di Fisica Nucleare - Sezione di Perugia)
Riccardo Natali (University of Camerino, Istituto Nazionale di Fisica Nucleare - Sezione di Perugia)
Antonio Borrielli (Institute of Materials for Electronics and Magnetism - Nanoscience-Trento-FBK Division)
Gregory Pandraud (TU Delft - EKL Processing, TU Delft - Else Kooi Laboratory)
Enrico Serra (TU Delft - Else Kooi Laboratory, TU Delft - Electronic Components, Technology and Materials, Trento Institute for Fundamental Physics and Applications)
Giovanni Di Giuseppe (Istituto Nazionale di Fisica Nucleare - Sezione di Perugia, University of Camerino)
David Vitali (Istituto Nazionale di Ottica, Consiglio Nazionale delle Ricerche, Istituto Nazionale di Fisica Nucleare - Sezione di Perugia, University of Camerino)
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Abstract
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.