Enhancement of three-mode optomechanical interaction by feedback-controlled light
Nenad Kralj (University of Camerino)
Massimiliano Rossi (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, Trento Institute for Fundamental Physics and Applications)
Gregory Pandraud (TU Delft - EKL Processing)
Enrico Serra (Trento Institute for Fundamental Physics and Applications, TU Delft - Electronic Components, Technology and Materials)
Giovanni Di Giuseppe (University of Camerino, Istituto Nazionale di Fisica Nucleare - Sezione di Perugia)
David Vitali (Istituto Nazionale di Fisica Nucleare - Sezione di Perugia, University of Camerino)
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Abstract
We realise a feedback-controlled optical Fabry-Pérot cavity in which the transmitted cavity output is used to modulate the input amplitude fluctuations. The resulting phase-dependent fluctuations of the in-loop optical field, which may be either sub-shot or super-shot noise, can be engineered to favourably affect the optomechanical interaction with a nanomechanical membrane placed within the cavity. Here we show that in the super-shot-noise regime ('anti-squashed light') the in-loop field has a strongly reduced effective cavity linewidth, corresponding to an increased optomechanical cooperativity. In this regime, feedback improves the simultaneous resolved-sideband cooling of two nearly degenerate membrane mechanical modes by one order of magnitude.
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