Geometry-induced Casimir suspension of oblate bodies in fluids

Alejandro W. Rodriguez, M. T.Homer Reid, Francesco Intravaia, Alexander Woolf, Diego A.R. Dalvit, Federico Capasso, Steven G. Johnson

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

We predict that a low-permittivity oblate body (disk-shaped object) above a thin metal substrate (plate with a hole) immersed in a fluid of intermediate permittivity will experience a metastable equilibrium (restoring force) near the center of the hole. Stability is the result of a geometry-induced transition in the sign of the force, from repulsive to attractive, that occurs as the disk approaches the hole - in planar or nearly planar geometries, the same material combination yields a repulsive force at all separations, in accordance with the Dzyaloshinski-Lifshitz-Pitaevski condition of fluid-induced repulsion between planar bodies. We explore the stability of the system with respect to rotations and lateral translations of the disks and demonstrate interesting transitions (bifurcations) in the rotational stability of the disks as a function of their size. Finally, we consider the reciprocal situation in which the disk-plate materials are interchanged and find that in this case the system also exhibits metastability. The forces in the system are sufficiently large to be observed in experiments and should enable measurements based on the diffusion dynamics of the suspended bodies.

Original languageEnglish (US)
Article number180402
JournalPhysical review letters
Volume111
Issue number18
DOIs
StatePublished - Oct 29 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Geometry-induced Casimir suspension of oblate bodies in fluids'. Together they form a unique fingerprint.

  • Cite this

    Rodriguez, A. W., Reid, M. T. H., Intravaia, F., Woolf, A., Dalvit, D. A. R., Capasso, F., & Johnson, S. G. (2013). Geometry-induced Casimir suspension of oblate bodies in fluids. Physical review letters, 111(18), [180402]. https://doi.org/10.1103/PhysRevLett.111.180402