Lateral Casimir Force on a Rotating Particle near a Planar Surface

Manjavacas, Alejandro; Rodríguez-Fortuño, Francisco J.; Abajo, F. Javier García de; Zayats, Anatoly V.

doi:10.1103/physrevlett.118.133605

Cited by 88 publications

(95 citation statements)

References 43 publications

(66 reference statements)

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“…The first term corresponds to the interaction of fluctuating dipole moment of the particle with thermal fields induced by the particle itself. By calculating induced thermal field using Green's function, it can be shown that this does not lead to any lateral force on the particle because of translational invariance [61]. Note that we are primarily interested in the lateral forces since the perpendicular forces exist in the near-field of all materials [59] and cannot be used to detect PPHC.…”

Section: Experimental Proposalmentioning

confidence: 99%

Thermal spin photonics in the near-field of nonreciprocal media

Khandekar

Jacob

2019

New J. Phys.

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The interplay of spin angular momentum and thermal radiation is a frontier area of interest to nanophotonics as well as topological physics. Here, we show that a thick planar slab of a nonreciprocal material, despite being at thermal equilibrium with its environment, can exhibit nonzero photon spin angular momentum and nonzero radiative heat flux in its vicinity. We identify them as the persistent thermal photon spin and the persistent planar heat current respectively. With a practical example system, we reveal that the fundamental origin of these phenomena is connected to the spinmomentum locking of thermally excited evanescent waves. We also discover spin magnetic moment of surface polaritons that further clarifies these features. We then propose an imaging experiment based on Brownian motion that allows one to witness these surprising features by directly looking at them using a lab microscope. We further demonstrate the universal behavior of these near-field thermal radiation phenomena through a comprehensive analysis of gyroelectric, gyromagnetic and magneto-electric nonreciprocal materials. Together, these results expose a surprisingly little explored research area of thermal spin photonics with prospects for new avenues related to non-Hermitian topological photonics and radiative heat transport.

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Section: Experimental Proposalmentioning

confidence: 99%

Thermal spin photonics in the near-field of nonreciprocal media

Khandekar

Jacob

2019

New J. Phys.

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“…We also investigate different dynamic behaviors of a nanosphere and a nanodumbbell. This nanorotor torque sensor will be particularly suitable to detect the long-sought vacuum friction [7][8][9][10]. A fast rotating neutral nanoparticle can convert quantum and thermal vacuum fluctuations to radiation emission.…”

mentioning

confidence: 99%

Ultrasensitive torque detection with an optically levitated nanorotor

Ahn¹,

Xu²,

Bang³

et al. 2020

Nat. Nanotechnol.

219

180

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Torque sensors such as the torsion balance enabled the first determination of the gravitational constant by Cavendish [1] and the discovery of Coulomb's law. Torque sensors are also widely used in studying small-scale magnetism [2,3], the Casimir effect [4], and other applications [5]. Great effort has been made to improve the torque detection sensitivity by nanofabrication and cryogenic cooling. The most sensitive nanofabricated torque sensor has achieved a remarkable sensitivity of 10 −24 Nm/ √Hz at millikelvin temperatures in a dilution refrigerator [6]. Here we dramatically improve the torque detection sensitivity by developing an ultrasensitive torque sensor with an optically levitated nanorotor in vacuum. We measure a torque as small as (1.2±0.5)×10 −27 Nm in 100 seconds at room temperature. Our system does not require complex nanofabrication or cryogenic cooling. Moreover, we drive a nanoparticle to rotate at a record high speed beyond 5 GHz (300 billion rpm). Our calculations show that this system will be able to detect the long-sought vacuum friction [7-10] near a surface under realistic conditions. The optically levitated nanorotor will also have applications in studying nanoscale magnetism [2,3] and quantum geometric phase [11].

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“…For linearly polarized dipoles, the optical force has no lateral components [21][22][23][24] and acts exclusively along z (vertical force). The vertical component F z (h) is conservative, allowing us to calculate the potential energy landscape U (h) = F z dz of the dipole in the vicinity of the surface.…”

Section: A Optical Force On Dipoles Above Two-dimensional Sheetsmentioning

confidence: 99%

“…Although a lateral force (directed alongx orŷ) may exist for circularly polarized dipoles [21][22][23][24], corresponding to the terms ∇G ij with i = j , here we are interested on the vertical force component only, which is given by the terms ∂G ij /∂z…”

Section: Appendix B: Time-averaged Force On a Dipole Near A Surfacementioning

confidence: 99%

Repulsion of polarized particles from two-dimensional materials

2018

Self Cite

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Repulsion of nanoparticles, molecules, and atoms from surfaces can have important applications in nanomechanical devices, microfluidics, optical manipulation, and atom optics. Here, through the solution of a classical scattering problem, we show that a dipole source oscillating at a frequency ω can experience a robust and strong repulsive force when its near-field interacts with a two-dimensional material. As an example, the case of graphene is considered, showing that a broad bandwidth of repulsion can be obtained at frequencies for which propagation of plasmon modes is allowed 0

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Lateral Casimir Force on a Rotating Particle near a Planar Surface

Cited by 88 publications

References 43 publications

Thermal spin photonics in the near-field of nonreciprocal media

Thermal spin photonics in the near-field of nonreciprocal media

Ultrasensitive torque detection with an optically levitated nanorotor

Repulsion of polarized particles from two-dimensional materials

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