All-optical sub-Kelvin sympathetic cooling of a levitated microsphere in vacuum

Arita, Yoshihiko; Bruce, Graham D.; Wright, E. M.; Simpson, Stephen H.; Zemánek, Pavel; Dholakia, Kishan

doi:10.1364/optica.466337

Cited by 17 publications

(13 citation statements)

References 16 publications

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“…More broadly, such ''optically bound matter'' may lead to self-organized systems 23,24 . In our case, this showed a purely optical route for sympathetic cooling wherein both the directly cooled particle and the adjacent trapped particle achieved temperatures below 1K 22 .…”

Section: Multiple Birefringent Particles In Vacuummentioning

confidence: 61%

“…To this end, in our recent studies we confined two birefringent trapped particles with control over the inter-particle separation. In this case, whilst holding two particles, we performed parametric feedback cooling upon one of them while observing the behaviour of the adjacent trapped particle 22 . Two such rotating microparticles trapped in close proximity may exhibit optical binding: This is an interaction mediated by light scattering whose strength is dependent on the inter-particle separation 23 .…”

Section: Multiple Birefringent Particles In Vacuummentioning

confidence: 99%

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Rotational levitated optomechanics with birefringent particles

Dholakia

2023

SPIE-CLP Conference on Advanced Photonics 2023

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Section: Multiple Birefringent Particles In Vacuummentioning

confidence: 61%

Section: Multiple Birefringent Particles In Vacuummentioning

confidence: 99%

Rotational levitated optomechanics with birefringent particles

Dholakia

2023

SPIE-CLP Conference on Advanced Photonics 2023

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“…Additionally, we illustrate how the presence of a second particle alters the trapping potential experienced by the first particle. These interactions of two or more particles in the array will be a topic of future study, as they may open new frontiers in optical binding, synchronization, and sympathetic control over particle motion. , …”

Section: Discussionmentioning

confidence: 99%

“…These interactions of two or more particles in the array will be a topic of future study, as they may open new frontiers in optical binding, synchronization, and sympathetic control over particle motion. 35,36 ■ ASSOCIATED CONTENT * sı Supporting Information…”

Section: ■ Conclusionmentioning

confidence: 99%

Fano Resonance-Assisted All-Dielectric Array for Enhanced Near-Field Optical Trapping of Nanoparticles

Conteduca,

Khan,

Martínez Ruiz

et al. 2023

ACS Photonics

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Near-field optics can overcome the diffraction limit by creating strong optical gradients to enable the trapping of nanoparticles. However, it remains challenging to achieve efficient, stable trapping without heating and thermal effects. Dielectric structures have been used to address this issue but usually offer weak trap stiffness. In this work, we exploit the Fano resonance effect in an all-dielectric quadrupole nanostructure to realize a 20-fold enhancement of trap stiffness, compared to the off-resonance case. This enables a high effective trap stiffness of 1.19 fN/nm for 100 nm diameter polystyrene nanoparticles with 4.2 mW/μm2 illumination. Furthermore, we demonstrate the capability of the structure to simultaneously trap two particles at distinct locations within the nanostructure array.

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“…Most significantly, these techniques have recently enabled motional cooling of nanoparticles towards and into their quantum mechanical ground state, in single and multiple degrees of freedom [7][8][9][10] with the future promise of macroscopic entanglement [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Synchronization of spin-driven limit cycle oscillators optically levitated in vacuum

Brzobohatý¹,

Martin²,

Jákl³

et al. 2023

Preprint

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We explore, experimentally and theoretically, the emergence of coherent coupled oscillations and synchronization between a pair of non-Hermitian, stochastic, opto-mechanical oscillators, levitated in vacuum. Each oscillator consists of a polystyrene microsphere trapped in a circularly polarized, counter-propagating Gaussian laser beam. Non-conservative, azimuthal forces, deriving from inhomogeneous optical spin, push the micro-particles out of thermodynamic equilibrium. For modest optical powers each particle shows a tendency towards orbital circulation. Initially, their stochastic motion is weakly correlated. As the power is increased, the tendency towards orbital circulation strengthens and the motion of the particles becomes highly correlated. Eventually, centripetal forces overcome optical gradient forces and the oscillators undergo a collective Hopf bifurcation. For laser powers exceeding this threshold, a pair of limit cycles appear, which synchronize due to weak optical and hydrodynamic interactions. In principle, arrays of such Non-Hermitian elements can be arranged, paving the way for opto-mechanical topological materials or, possibly, classical time crystals. In addition, the preparation of synchronized states in levitated optomechanics could lead to new and robust sensors or alternative routes to the entanglement of macroscopic objects.

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All-optical sub-Kelvin sympathetic cooling of a levitated microsphere in vacuum

Abstract: We demonstrate all-optical sympathetic cooling of a laser-trapped microsphere to sub-Kelvin temperatures, mediated by optical binding to a feedback-cooled adjacent particle. Our study opens prospects for multi-particle quantum entanglement and sensing in levitated optomechanics.

Cited by 17 publications

References 16 publications

Rotational levitated optomechanics with birefringent particles

Rotational levitated optomechanics with birefringent particles

Fano Resonance-Assisted All-Dielectric Array for Enhanced Near-Field Optical Trapping of Nanoparticles

Synchronization of spin-driven limit cycle oscillators optically levitated in vacuum

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