Complex rotational dynamics of multiple spheroidal particles in a circularly polarized, dual beam trap

Brzobohatý, Oto; Arzola, Alejandro V.; Šiler, Martin; Chvátal, Lukáš; Jákl, Petr; Simpson, Stephen H.; Zemánek, Pavel

doi:10.1364/oe.23.007273

Cited by 44 publications

(44 citation statements)

References 54 publications

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“…4 inset) results in synchronous rotation similar to that observed for dielectric spheroids. 51,52 Optical binding forces act to constrain the centres of the wires to a single axis while spin optical angular momentum causes them to rotate in synchrony, in perfect alignment, at least when thermal fluctuations are neglected. The rotation rates vary with the nanowire lengths, increasing to a maximum at L ≈ 0.5 µm (for nanowires with d = 50 nm), and then decreasing towards zero (see Fig.…”

Section: Nanowire Thickness (Nm)mentioning

confidence: 99%

Optical Binding of Nanowires

et al. 2017

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Multiple scattering of light induces structured interactions, or optical binding forces, between collections of small particles. This has been extensively studied in the case of microspheres. However, binding forces are strongly shape dependent: here, we turn our attention to dielectric nanowires. Using a novel numerical model we uncover rich behavior. The extreme geometry of the nanowires produces a sequence of stationary and dynamic states. In linearly polarized light, thermally stable ladder-like structures emerge. Lower symmetry, sagittate arrangements can also arise, whose configurational asymmetry unbalances the optical forces leading to nonconservative, translational motion. Finally, the addition of circular polarization drives a variety of coordinated rotational states whose dynamics expose fundamental properties of optical spin. These results suggest that optical binding can provide an increased level of control over the positions and motions of nanoparticles, opening new possibilities for driven self-organization and heralding a new field of self-assembling optically driven micromachines.

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Section: Nanowire Thickness (Nm)mentioning

confidence: 99%

Optical Binding of Nanowires

et al. 2017

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“…In the case of small molecules with a sharp internal transition, the ro-translational motion can be laser cooled by exploiting the methods developed for atoms [12][13][14]. Micron-sized particles in solution and low vacuum can be trapped and manipulated rotationally with optical tweezers and vortex beams [15][16][17][18][19][20][21][22][23]. A first step towards controlling the ro-translational state of a nanometer-sized rod in high vacuum was demonstrated only recently [24].…”

Section: Introductionmentioning

confidence: 99%

Rotranslational cavity cooling of dielectric rods and disks

et al. 2016

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We study the interaction of dielectric rods and disks with the laser field of a high finesse cavity. The quantum master equation for the coupled particle-cavity dynamics, including Rayleigh scattering, is derived for particle sizes comparable to the laser wavelength. We demonstrate that such anisotropic nanoparticles can be captured from free flight at velocities higher than those required to capture dielectric spheres of the same volume, and that efficient ro-translational cavity cooling into the deep quantum regime is achievable.

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“…Recently, there has been some effort to exploit that anisotropically shaped nanoparticles enhance the interaction with the cavity field [19][20][21][22]. While such nanoparticles can be well controlled in solution and low vacuum [23][24][25][26][27][28][29][30][31][32], coherence experiments involving the orientational degrees of freedom [21,22,[33][34][35][36] are still pending. Understanding the spatio-orientational decoherence processes in such experiments with ultra-cold anisotropic nanoparticles is a prerequisite for exploiting the quantum motion of the center of mass and the orientation.…”

Section: Introductionmentioning

confidence: 99%

Spatio-orientational decoherence of nanoparticles

2016

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Motivated by trapping and cooling experiments with non-spherical nanoparticles, we discuss how their combined rotational and translational quantum state is affected by the interaction with a gaseous environment. Based on the quantum master equation in terms of orientation-dependent scattering amplitudes, we evaluate the localization rate for gas collisions off an anisotropic van der Waals-type potential and for photon scattering off an anisotropic dielectric. We also show how pure angular momentum diffusion arises from these open quantum dynamics in the limit of weak anisotropies.

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Complex rotational dynamics of multiple spheroidal particles in a circularly polarized, dual beam trap

Cited by 44 publications

References 54 publications

Optical Binding of Nanowires

Optical Binding of Nanowires

Rotranslational cavity cooling of dielectric rods and disks

Spatio-orientational decoherence of nanoparticles

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