Sensitivity of micromechanical actuation on amorphous to crystalline phase transformations under the influence of Casimir forces

Ghozotkhar, Mehdi Sedighi; Broer, Wijnand; Palasantzas, G.; Kooi, Bart J.

doi:10.1103/physrevb.88.165423

Cited by 43 publications

(51 citation statements)

References 48 publications

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“…For this purpose (11) has been used where the reflection coefficients are given by (12) and (4). The latter equation was expressed in terms of the dimensionless variables with account of (14). We show that if the plate is made of dielectric material its thickness may have a profound effect on the Casimir free energy of a film.…”

Section: Silica Filmsmentioning

confidence: 99%

“…They are responsible for interaction of electrically neutral, but polarizable, particles with material surfaces [7,8,9,10], find applications in nanoscience [11,12,13,14], play important role in many effects of condensed matter physics [15,16,17,18,19,20], and are even used in elementary particle physics for constraining some theoretical predictions beyond the standard model [21,22,23].…”

Section: Introductionmentioning

confidence: 99%

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Casimir free energy of dielectric films: classical limit, low-temperature behavior and control

Mostepanenko¹

2017

J. Phys.: Condens. Matter

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Abstract. The Casimir free energy of dielectric films, both free-standing in vacuum and deposited on metallic or dielectric plates, is investigated. It is shown that the values of the free energy depend considerably on whether the calculation approach used neglects or takes into account the dc conductivity of film material. We demonstrate that there are the material-dependent and universal classical limits in the former and latter cases, respectively. The analytic behavior of the Casimir free energy and entropy for a free-standing dielectric film at low temperature is found. According to our results, the Casimir entropy goes to zero when the temperature vanishes if the calculation approach with neglected dc conductivity of a film is employed. If the dc conductivity is taken into account, the Casimir entropy takes the positive value at zero temperature, depending on the parameters of a film, i.e., the Nernst heat theorem is violated. By considering the Casimir free energy of SiO 2 and Al 2 O 3 films deposited on a Au plate in the framework of two calculation approaches, we argue that physically correct values are obtained by disregarding the role of dc conductivity. A comparison with the well known results for the configuration of two parallel plates is made. Finally, we compute the Casimir free energy of SiO 2 , Al 2 O 3 and Ge films deposited on high-resistivity Si plates of different thicknesses and demonstrate that it can be positive, negative and equal to zero. The effect of illumination of a Si plate with laser light is considered. Possible applications of the obtained results to thin films used in microelectronics are discussed.

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Section: Silica Filmsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Casimir free energy of dielectric films: classical limit, low-temperature behavior and control

Mostepanenko¹

2017

J. Phys.: Condens. Matter

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“…[11][12][13] for a review). In so doing, puzzling findings concerning the role of dissipation of free charge carriers in metals have been reported [14][15][16][17][18][19] and important applications of dispersion forces in micromechanical systems [20][21][22] and nanochips [23] have been proposed.…”

Section: Introductionmentioning

confidence: 99%

How to observe the giant thermal effect in the Casimir force for graphene systems

Bimonte

Mostepanenko

2017

Phys. Rev. A

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A differential measurement scheme is proposed which allows for a clear observation of the giant thermal effect for the Casimir force, that was recently predicted to occur in graphene systems at short separation distances. The difference among the Casimir forces acting between a metal-coated sphere and the two halves of a dielectric plate, one uncoated and the other coated with graphene, is calculated in the framework of the Dirac model using the rigorous formalism of the polarization tensor. It is shown that in the proposed configuration both the difference among the Casimir forces and its thermal contribution can be easily measured using already existing experimental setups.An observation of the giant thermal effect should open opportunities for modulation and control of dispersion forces in micromechanical systems based on graphene and other novel 2D-materials.

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“…Furthermore, we introduce the Casimir bifurcation parameter δ Cas = τ m Cas /kθ 0 , which represents the ratio of the minimum Casimir torque τ m Cas = τ Cas (θ = 0) and the maximum restoring torque kθ 0 [44,45], and the bifurcation parameter for the electrostatic force…”

Section: Modeling Of Dynamical Systemmentioning

confidence: 99%

Dependence of chaotic actuation dynamics of Casimir oscillators on optical properties and electrostatic effects

et al. 2018

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Abstract. With Casimir and electrostatic forces playing a crucial role for the performance and stability of microelectromechanical systems (MEMS), the presence of chaotic behavior, which is often unavoidable, leads to device malfunction due to stiction. Therefore, we investigate here how the optical properties of different materials influence the chaotic behavior of electrostatic torsional MEMS due to changes in magnitude of the Casimir forces and torques. We consider the materials Au, which is a good conductor, AIST, which is a phase change material being close to metal in the crystalline state, and finally doped SiC as a very poor conductor. For the conservative systems, there is no chaotic behavior and the analysis of phase portraits and bifurcation diagrams reveal the strong sensitivity of stable actuation dynamics on the material optical properties, while applied electrostatic potentials lead faster to instability and stiction for higher conductivity materials. For the driven systems, the Melnikov method is used to study the chaotic behavior. The results from this method are supported by the study of the contours of the transient time to stiction in the phase plane, which reveal a substantially increased chaotic behavior for higher conductivity materials, associated with stronger Casimir torques and applied electrostatic potentials.

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Sensitivity of micromechanical actuation on amorphous to crystalline phase transformations under the influence of Casimir forces

Cited by 43 publications

References 48 publications

Casimir free energy of dielectric films: classical limit, low-temperature behavior and control

Casimir free energy of dielectric films: classical limit, low-temperature behavior and control

How to observe the giant thermal effect in the Casimir force for graphene systems

Dependence of chaotic actuation dynamics of Casimir oscillators on optical properties and electrostatic effects

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