Strong and tunable nonlinear optomechanical coupling in a low-loss system

• Published in: Nature physics Vol. 6; no. 9; pp. 707 - 712
• Main Authors: Zwickl, B. M, Sankey, J. C, Jayich, A. M, Harris, J. G. E, Yang, C
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 01-09-2010; Nature Publishing Group
• Subjects: Atomic; Classical and Continuum Physics; Complex Systems; Condensed Matter Physics; Control systems; Couplings; Degrees of freedom; Devices; Displacement; Flexibility; Holes; Joining; Mathematical analysis; Mathematical and Computational Physics; Membranes; Molecular; Nonlinear systems; Optical and Plasma Physics; Optics; Physics; Physics and Astronomy; Quantum physics; Theoretical
• ISSN: 1745-2473; 1745-2481
• DOI: 10.1038/nphys1707

A major goal in optomechanics is to observe and control quantum behaviour in a system consisting of a mechanical resonator coupled to an optical cavity. Work towards this goal has focused on increasing the strength of the coupling between the mechanical and optical degrees of freedom. However, the form of this coupling is crucial in determining which phenomena can be observed in such a system. Here we demonstrate that avoided crossings in the spectrum of an optical cavity containing a flexible dielectric membrane enable us to realize several different forms of the optomechanical coupling. These include cavity detunings that are (to lowest order) linear, quadratic or quartic in the membrane’s displacement, and a cavity finesse that is linear in (or independent of) the membrane’s displacement. All these couplings are realized in a single device with extremely low optical loss and can be tuned over a wide range
in situ
. In particular, we find that the quadratic coupling can be increased three orders of magnitude beyond previous devices. As a result of these advances, the device presented here should be capable of demonstrating the quantization of the membrane’s mechanical energy.
An optical cavity coupled to a micrometre-sized mechanical resonator offers the opportunity to see quantum effects in relatively large structures. It is now shown that a variety of coupling mechanisms enable investigation of these fascinating systems in a number of different ways.