Synchronizing noncontact rack-and-pinion devices

Nasiri, Mojtaba; Miri, MirFaez; Golestanian, Ramin

doi:10.1063/1.3694050

Cited by 9 publications

(6 citation statements)

References 27 publications

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“…Since re ik•r = ike ik•r we immediately find the recoil force Eq. (3), which leads to the lateral forces (6) and (7). We are now left with a remarkable conclusion.…”

mentioning

confidence: 84%

“…In recent years, lateral Casimir (surface-surface) and Casimir-Polder (atom-surface) [5] forces have received attention due to their potential to realise contactless force transmission [6,7], as well as novel types of sensors and clocks [8]. All of these works rely on corrugated surfaces [9][10][11][12][13][14], gratings [15][16][17][18], or gyrotopic response [19].…”

mentioning

confidence: 99%

“…Our next step is to recognise that the excited-state interatomic force can be understood as a recoil force originating from the exchange of excitations with the environment, for which we present an alternative derivation of Eq. (3) [and thereby Eqs (6) and (7)], based on emission spectra instead of forces [42]. To do this we begin by calculating the spontaneous decay rate for atom A in the excited state |1i in the presence of a second atom B.…”

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confidence: 99%

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Lateral interatomic dispersion forces

2020

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Van der Waals forces between atoms and molecules are universally assumed to act along the line separating them. Inspired by recent works on e↵ects which can propel atoms parallel to a macroscopic surface via the Casimir-Polder force, we predict a lateral van der Waals force between two atoms, one of which is in an excited state with non-zero angular momentum and the other is isotropic and in its ground state. The resulting force acts in the same way as a planetary gear, in contrast to the rack-and-pinion motion predicted in works on the lateral Casimir-Polder force in the analogous case, for which the force predicted here is the microscopic origin. We illustrate the e↵ect by predicting the trajectories of an excited caesium in the vicinity of ground-state rubidium, finding behaviour qualitatively di↵erent to that if lateral forces are ignored.

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“…Since re ik•r = ike ik•r we immediately find the recoil force Eq. (3), which leads to the lateral forces (6) and (7). We are now left with a remarkable conclusion.…”

mentioning

confidence: 84%

mentioning

confidence: 99%

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confidence: 99%

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Lateral interatomic dispersion forces

2020

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“…Tiny elements are also susceptible to wear [9][10][11], thus the operation lifetime of miniaturized machines is a concern. To remedy these problems, it has been noticed that the lateral Casimir force [12][13][14][15] can intermesh noncontact parts of nanomachines [16][17][18][19][20][21][22][23][24]. In view of designing useful nanoscale mechanical devices, the dependence of Casimir force between bodies on their material and geometrical properties is still a subject of intense investigation [25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Casimir rack and pinion: Mechanical rectification of periodic multi-harmonic signals

Dehyadegari,

Miri,

Etesami

2015

Preprint

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We study noncontact rack and pinion composed of a corrugated plate and a corrugated cylinder intermeshed via the lateral Casimir force. We assume that the rack position versus time is a periodic multi-harmonic signal. We show that in a large domain of parameter space and at room temperature, the device acts as a mechanical rectifier: The pinion rotates with a nonzero average velocity and lifts up an external load. The thermal noise may even facilitate the device operation.

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“…The magnitude of this force is significant when H is less than a micron [3]. Therefore the Casimir effect must be taken into account in designing micro-and nano-devices [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Nonmonotonic Casimir interaction: The role of amplifying dielectrics

Soltani

Sarabadani²,

Zakeri

2017

Phys. Rev. A

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The normal and the lateral Casimir interactions between corrugated ideal metallic plates in the presence of an amplifying or an absorptive dielectric slab has been studied by the path-integral quantization technique. The effect of the amplifying slab, which is located between corrugated conductors, is to increase the normal and lateral Casimir interactions, while the presence of the absorptive slab diminishes the interactions. These effects are more pronounced if the thickness of the slab increases, and also if the slab comes closer to one of the bounding conductors. When both bounding ideal conductors are flat, the normal Casimir force is non-monotonic in the presence of the amplifying slab and the system has a stable mechanical equilibrium state, while the force is attractive and is weakened by intervening the absorptive dielectric slab in the cavity. By replacing one of the flat conductors by a flat ideal permeable plate the force becomes non-monotonic and the system has an unstable mechanical equilibrium state in the presence of either an amplifying or an absorptive slab. When the left side plate is conductor and the right one is permeable, the force is non-monotonic in the presence of a double-layer DA (dissipative-amplifying) dielectric slab with a stable mechanical equilibrium state, while it is purely repulsive in the presence of a double-layer AD (amplifying-dissipative) dielectric slab.

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Synchronizing noncontact rack-and-pinion devices

Cited by 9 publications

References 27 publications

Lateral interatomic dispersion forces

Lateral interatomic dispersion forces

Casimir rack and pinion: Mechanical rectification of periodic multi-harmonic signals

Nonmonotonic Casimir interaction: The role of amplifying dielectrics

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