Coherent mechanical noise cancellation and cooperativity competition in optomechanical arrays
Matthijs H.J. De Jong (Kavli institute of nanoscience Delft, TU Delft - Dynamics of Micro and Nano Systems, TU Delft - QN/Groeblacher Lab)
J. Li (Kavli institute of nanoscience Delft, TU Delft - QN/Groeblacher Lab, Zhejiang University)
C.M. Gartner (Kavli institute of nanoscience Delft, TU Delft - QN/Groeblacher Lab)
Richard Norte (TU Delft - Dynamics of Micro and Nano Systems)
Simon Groeblacher (TU Delft - QN/Groeblacher Lab, Kavli institute of nanoscience Delft)
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Abstract
Studying the interplay between multiple coupled mechanical resonators is a promising new direction in the field of optomechanics. Understanding the dynamics of the interaction can lead to rich new effects, such as enhanced coupling and multi-body physics. In particular, multi-resonator optomechanical systems allow for distinct dynamical effects due to the optical cavity coherently coupling mechanical resonators. Here, we study the mechanical response of two SiN membranes and a single optical mode, and find that the cavity induces a time delay between the local and cavity-transduced thermal noises experienced by the resonators. This results in an optomechanical phase lag that causes destructive interference, cancelling the mechanical thermal noise by up to 20 dB in a controllable fashion and matching our theoretical expectation. Based on the effective coupling between membranes, we further propose, derive, and measure a collective effect, cooperativity competition on mechanical dissipation, whereby the linewidth of one resonator depends on the coupling efficiency (cooperativity) of the other resonator.