Normal-Mode Splitting in a Weakly Coupled Optomechanical System

Year: 2018

Authors: Rossi M., Kralj N., Zippilli S., Natali R., Borrielli A., Pandraud G., Serra E., Di Giuseppe G., Vitali D.

Autors Affiliation: School of Higher Studies ‘C. Urbani’, University of Camerino, 62032 Camerino, Macerata, Italy; School of Science and Technology, Physics Division, University of Camerino, 62032 Camerino, Macerata, Italy; INFN, Sezione di Perugia, 06123 Perugia, Italy; Institute of Materials for Electronics and Magnetism, Nanoscience-Trento-FBK Division, 38123 Povo, Trento, Italy; Delft University of Technology, Else Kooi Laboratory, 2628 Delft, The Netherlands; Istituto Nazionale di Fisica Nucleare, TIFPA, 38123 Povo, Trento, Italy; CNR-INO, L.go Enrico Fermi 6, I-50125 Firenze, Italy

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.


Volume: 120 (7)      Pages from: 073601-1  to: 073601-5

More Information: We acknowledge the support of the European Union
DOI: 10.1103/PhysRevLett.120.073601

Citations: 40
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