Enhancement of three-mode optomechanical interaction by feedback-controlled light

Nenad Kralj, Massimiliano Rossi, Stefano Zippilli, Riccardo Natali, Antonio Borrielli, Gregory Pandraud, Enrico Serra, Giovanni Di Giuseppe, David Vitali*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

20 Citations (Scopus)


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.

Original languageEnglish
Article number034014
Pages (from-to)1-12
Number of pages12
JournalQuantum Science and Technology
Issue number3
Publication statusPublished - 2017


  • cavity optomechanics
  • in-loop optical fields
  • mechanical resonators
  • optical measurement and feedback


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