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Engineering Casimir interactions with epsilon-near-zero materials

Miguel Camacho1,2, Tao Gong3,4, Benjamin Spreng3, Iñigo Liberal5, Nader Engheta1,*, and Jeremy N. Munday3,†

  • 1Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
  • 2Department of Electronics and Electromagnetism, Universidad de Sevilla, 41012 Seville, Spain
  • 3Department of Electrical and Computer Engineering, University of California, Davis, California 95616, USA
  • 4Department of Materials Science and Engineering, University of California, Davis, California 95616, USA
  • 5Department of Electrical and Electronic Engineering, Public University of Navarra, 31006 Pamplona, Spain

  • *engheta@ee.upenn.edu
  • †jnmunday@ucdavis.edu
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Phys. Rev. A 105, L061501 – Published 3 June, 2022

DOI: https://doi.org/10.1103/PhysRevA.105.L061501

Abstract

In this paper, we theoretically demonstrate the tunability of the Casimir force both in sign and magnitude between parallel plates coated with dispersive materials. We show that this force, existing between uncharged plates, can be tuned by carefully choosing the value of the plasma frequency (i.e., the epsilon-near-zero frequency) of the coating in the neighborhood of the resonance frequency of the cavity. The coating layer enables a continuous variation of the force between four limiting values when a coating is placed on each plate. We explore the consequences of such variation when pairs of electric and magnetic conductors (i.e., low and high impedance surfaces) are used as substrates on either side, showing that this continuous variation results in changes in the sign of the force, leading to both stable and unstable conditions, which could find interesting potential applications in nanomechanics, including nanoparticle tweezing.

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Phys. Rev. A 105, L061501– Published 3 June, 2022
  • Received 10 December 2021
  • Accepted 10 May 2022
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