Measurement of the Casimir torque

Somers, David A. T.; Garrett, Joseph L.; Palm, Kevin J.; Munday, Jeremy N.

doi:10.1038/s41586-018-0777-8

Cited by 98 publications

(84 citation statements)

References 39 publications

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“…Our approach does not depend on approximations such as weak anisotropy or neglecting retardation effects, and can be generalized to other types of media, such as metamaterials [34], multiferroics [35], topological matter [41], biaxial materials [31], and non-reciprocal materials [42]. The recently reported measurements of the Casimir torque [20] should instigate further investigations for which this result is of considerable importance. ACKNOWLEDGMENTS WB thanks B. J. Hoenders for a useful email exchange.…”

Section: Discussionmentioning

confidence: 84%

“…1). Several experimental setups to detect the torque have been proposed [16][17][18][19], but only recently has this phenomenon been observed experimentally [20].…”

Section: Introductionmentioning

confidence: 99%

“…The recent development of the experimental observation of the Casimir torque [20] will instigate more investigations on this phenomenon, which necessitates a systematic and transparent formalism to describe it theoretically. The main obstacle is the failure of the usual decomposition into perpendicular s-polarized (or transverse electric) and p-polarized (transverse magnetic) modes.…”

Section: Introductionmentioning

confidence: 99%

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Maxwell eigenmode approach to the Casimir-Lifshitz torque

Broer

Liow

2019

Phys. Rev. A

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More than forty years ago, Barash published a calculation of the full retarded Casimir-Lifshitz torque for planar birefringent media with arbitrary degrees of anisotropy. An independent theoretical confirmation has been lacking since. We report a systematic and transparent derivation of the torque between two media with both electric and magnetic birefringence. Our approach, based on an eigenmode decomposition of Maxwell's equations, generalizes Barash's result for electrically birefringent materials, and can be generalized to a wide range of anisotropic materials and finite thickness effects. *

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Section: Discussionmentioning

confidence: 84%

“…1). Several experimental setups to detect the torque have been proposed [16][17][18][19], but only recently has this phenomenon been observed experimentally [20].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Maxwell eigenmode approach to the Casimir-Lifshitz torque

Broer

Liow

2019

Phys. Rev. A

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“…Though the Casimir-Lifshitz torque was theoretically predicted as early as 1961 1 , it was only in 2018 that its existence was experimentally confirmed 6 . With this accomplishment, further investigations of the magnitude and nature of the torque are indispensable for the ultimate goal of feasible practical applications.…”

Section: Introductionmentioning

confidence: 99%

“…While this degree of sensitivity has now been established as achievable by the precision experiment in Ref. 6 , theoretical efforts to augment the magnitude of torque from material considerations 7,8 as well as techniques such as application of an external magnetic field 10 had been underway. Reference 11 predicted a Casimir torque between photonic topological insulators tunable by an external magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Effect of excess charge carriers and fluid medium on the magnitude and sign of the Casimir-Lifshitz torque

et al. 2019

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Last year, we reported a perturbative theory of the Casimir-Lifshitz torque between planar biaxially anisotropic materials in the retarded limit [Phys. Rev. Lett. 120, 131601 (2018)], which is applied here to study the change of sign and magnitude of the torque with separation distance in biaxial black phosphorus having excess charge carriers. The study is carried out both in vacuum as well as in a background fluid medium. The presence of extra charge carriers and that of an intervening fluid medium are both found to promote enhancement of the magnitude of the torque between identical slabs. The degree of enhancement of the magnitude of torque increases not only with an increased carrier concentration but also with separation distance. In the non-identical case when different planes of anisotropic black phosphorus face each other, owing to the non-monotonic characteristic of the sign-reversal effect of the torque, the enhancement by carrier addition and intervening medium also becomes non-monotonic with distance. In the presence of a background medium, the non-monotonic degree of enhancement of the torque is observed even between identical slabs.

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Mode Coupling in Electromechanical Systems: Recent Advances and Applications

Guo

Fang

Chen

et al. 2023

Adv Elect Materials

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Mode interactions have recently become the focus of intense research in micro/nanoelectromechanical systems (M/NEMS) due to their ability to improve device performance and explore the frontiers of fundamental physics. Understanding and controlling coupling between vibrational modes are critical for the development of advanced M/NEMS devices. This review summarizes the recent advances in studies of coupling between multiple modes in M/NEMS resonators, focusing especially on experimental developments and practical applications. First, depending on spatial distribution of interacting modes, this review divides the coupled mechanism in three types: intermode, near‐neighbor, and long‐range coupling. Then, several fundamental physics approaches based on mechanical‐mode coupling, including linear and nonlinear coupling, modal localization, synchronization, and phonon manipulation are reviewed. This review also introduces sensing applications by using coupled mechanical modes. Finally, the state‐of‐the‐art open questions and challenges are reviewed.

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Measurement of the Casimir torque

Cited by 98 publications

References 39 publications

Maxwell eigenmode approach to the Casimir-Lifshitz torque

Maxwell eigenmode approach to the Casimir-Lifshitz torque

Effect of excess charge carriers and fluid medium on the magnitude and sign of the Casimir-Lifshitz torque

Mode Coupling in Electromechanical Systems: Recent Advances and Applications

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