Coupling librational and translational motion of a levitated nanoparticle in an optical cavity

Liu, Shengyan; Li, Tongcang; Yin, Zhang‐qi

doi:10.1364/josab.34.0000c8

Cited by 15 publications

(13 citation statements)

References 39 publications

(52 reference statements)

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“…In complementary observations, gyroscopic stabilisation of the translational motion [145,213] and the orientation [173] has been observed by rotating particles at high speed. Coupling of rotational and translational degrees of freedom has also been shown for certain lower-symmetry particle morphologies, such as disks [226], while coupling between rotational and translational modes can also be enhanced in an optical cavity [227,228] or by painting a spot on the surface of a sphere and performing a continuous joint measurement of two motional modes [229]. For dumbbell-shaped particles, where the moments of inertia of the various rotational modes are comparable, the spinning motion about the symmetry axis couples the two degrees of librational motion, which results in precessional motion [167,230].…”

Section: Temperature Sensing and Controlmentioning

confidence: 94%

Initiating revolutions for optical manipulation: the origins and applications of rotational dynamics of trapped particles

Bruce

Rodríguez‐Sevilla

Dholakia

2020

Advances in Physics: X

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The fastest-spinning man-made object is a tiny dumbbell rotating at 5 GHz. The smallest wind-up motor is constructed from a DNA molecule. Picoliter volumes of fluids are remotely controlled and their viscosity precisely measured using microrheometers based on miniscule rotating particles. Theoretical predictions for extraordinarily weak forces related to the presence of dark matter, dark energy and vacuum-induced friction might be revealed, and the surprising properties of light have already been experimentally evidenced. All of these exciting landmarks have only been possible thanks to the torque exerted by light, which enables rotation of an optically trapped particle. Here, we review how light can impart torque on optically trapped particles, paying close attention to the design of the properties of both the particle and the light field. We detail how the maximum achievable rotation speed is limited by the environment, but can simultaneously be used to infer properties of the surrounding medium and of the light field itself. We also review the state-of-the-art applications of light-driven rotors, as well as proposals for the next generation of measurements, particularly at the classical-quantum interface, which can be performed using rotating optically trapped objects.

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Section: Temperature Sensing and Controlmentioning

confidence: 94%

Initiating revolutions for optical manipulation: the origins and applications of rotational dynamics of trapped particles

Bruce

Rodríguez‐Sevilla

Dholakia

2020

Advances in Physics: X

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“…The rotational motion of a levitated liquid differs from that of a levitated solid (described in Refs. [68][69][70][71][72][73][74][75]) in several important respects. These include the liquid's electromagnetic and mechanical isotropy (which should more closely approximate free rotation),the independence between the liquid's external shape and its rotation, and, in the case of superfluid 4 He, dissipationless nonrigid body rotational motion.…”

Section: Rotations a Towards Quantum Nondemolition Measurements mentioning

confidence: 99%

Cavity optomechanics in a levitated helium drop

et al. 2017

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We describe a proposal for a type of optomechanical system based on a drop of liquid helium that is magnetically levitated in vacuum. In the proposed device, the drop would serve three roles: its optical whispering-gallery modes would provide the optical cavity, its surface vibrations would constitute the mechanical element, and evaporation of He atoms from its surface would provide continuous refrigeration. We analyze the feasibility of such a system in light of previous experimental demonstrations of its essential components: magnetic levitation of mm-scale and cm-scale drops of liquid He, evaporative cooling of He droplets in vacuum, and coupling to high-quality optical whispering-gallery modes in a wide range of liquids. We find that the combination of these features could result in a device that approaches the single-photon strong-coupling regime, due to the high optical quality factors attainable at low temperatures. Moreover, the system offers a unique opportunity to use optical techniques to study the motion of a superfluid that is freely levitating in vacuum (in the case of 4 He). Alternatively, for a normal fluid drop of 3 He, we propose to exploit the coupling between the drop's rotations and vibrations to perform quantum nondemolition measurements of angular momentum.

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“…The side‐band cooling scheme of the torsional mode was also proposed 48 . This work stimulated a series of works such as the decoherence mechanism of the librational modes, 49,50 and coupling librational modes with the internal spins 51,52 or the translational degree of freedom 53 . Recently, the translational mode of an optically levitated nanoparticle coupling with a cavity has been cooled to its ground state experimentally and theoretically 36,54‐56 .…”

Section: Introductionmentioning

confidence: 97%

Quantum ground state cooling of translational and librational modes of an optically trapped nanoparticle coupling cavity

Xiao

Xiong

Zhao

et al. 2021

Quantum Engineering

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We systematically investigate the nonlinearity of librational and translational modes, and present a theoretical scheme for quantum ground state cooling of both librational and translational modes of an optically levitated nonspherical nanoparticle via cavity mode. By expanding the trapping potential to the fourth order of both the translational and librational freedom degrees, we obtain the inherent nonlinearity of them and their nonlinear coupling. Through stability analysis, bi‐ and multistability are presented in this system, when either the librational or the translational drive is red‐detuning. The system will be stabilized if and only if these two drives are both blue‐detuning. In order to obtain the quantum ground states of the motional modes of ellipsoidal nanoparticle, a cavity mode is utilized to cool the librational and translational modes. By optimizing the frequencies and amplitudes of drives and residual air pressure, the quantum ground states of the librational and translational modes can be realized at the same time.

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Coupling librational and translational motion of a levitated nanoparticle in an optical cavity

Cited by 15 publications

References 39 publications

Initiating revolutions for optical manipulation: the origins and applications of rotational dynamics of trapped particles

Initiating revolutions for optical manipulation: the origins and applications of rotational dynamics of trapped particles

Cavity optomechanics in a levitated helium drop

Quantum ground state cooling of translational and librational modes of an optically trapped nanoparticle coupling cavity

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