Hannover 2016 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 49: Optomechanics I
Q 49.6: Talk
Thursday, March 3, 2016, 12:15–12:30, f342
Position-Squared Coupling in a Tunable Optomechanical Cavity — •Taofiq Paraiso1, Mahmoud Kalaee3, Leyun Zang1, Hannes Pfeifer1, Florian Marquardt2, and Oskar Painter3 — 1MPI for the Science of Light, Germany — 2FAU Erlangen-Nürnberg, Germany — 3Caltech, Pasadena, CA, USA
Position-squared optomechanical coupling has been proposed as a means of performing the long-sought-after continuous quantum non-demolition (QND) measurements of a mechanical field. The stored energy in a mechanical resonator, proportional to its average squared displacement (x2), can be used to infer quantum jumps of photons or phonons. Despite significant technical advances made in recent years, achieving a x2 coupling large enough for preparing non-classical quantum states of mesoscopic mechanical resonators remains an open challenge. Here we demonstrate giant x2 coupling in a multimoded optomechanical resonator [1]. The device is a double-slotted quasi-2D photonic crystal cavity supporting a pair of optical resonances that both couple to the motion of the structure. Integrated capacitors are used to drive the system from the linear regime into the x2 coupling regime and to tune the optical normal mode splitting to arbitrarily small values. From independent measurements of the avoided crossing of the optical modes and of the static and dynamical spring effects, we measure a vacuum x2 coupling rate up to 5 orders of magnitudes larger than in conventional systems. We anticipate these novel platforms to enable the demonstration of quantum nonlinearities in optomechanics.
[1] T. Paraiso et al., Phys. Rev. X 5, 041024 (2015)