Bistability and squeezing of the librational mode of an optically trapped nanoparticle

Abstract

We systematically investigate the bistable behavior and squeezing property of the librational mode of a levitated nonspherical nanoparticle trapped by laser beams. By expanding the librational potential to the forth order of the librational angle $\theta$, we find that the nonlinear coefficient of this mode is dependent only on the size and material of nanoparticle, but independent of trapping potential shape. The bistability and hysteresis are displayed when the driving frequency is red-detuned to the librational mode. In the blue-detuned region, we have studied squeezing of the variance of librational mode in detail, which has potential application for measurement of angle and angular momentum.

16 pages, 6 figures, accepted for Phys. Rev. A

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Cited by in corpus (6)

• Mechanical squeezing via unstable dynamics in a microcavity
• Strong mechanical squeezing in a standard optomechanical system by pump modulation
• Auxiliary-cavity-assisted ground-state cooling of optically levitated nanosphere in the unresolved-sideband regime
• Controllable generation of mechanical quadrature squeezing via dark-mode engineering in cavity optomechanics
• Prethermalization and nonreciprocal phonon transport in a levitated optomechanical array
• Universal quantum gates between nitrogen-vacancy centers in a levitated nanodiamond