Quantum vacuum photon modes and repulsive Lifshitz-van der Waals interactions

TL;DR

This paper demonstrates theoretically that nanostructuring surfaces can manipulate quantum vacuum photon modes to switch Lifshitz-van der Waals forces from attractive to repulsive, enabling new surface control techniques.

Contribution

It introduces a theoretical method to achieve repulsive Lifshitz-van der Waals forces through surface nanopatterning, bypassing chemical modifications.

Findings

Nanostructuring can turn attractive forces into repulsive ones.

Small corrugations (<10 nm) are sufficient for force reversal.

Interaction strength is tunable via corrugation height.

Abstract

The bridge between quantum vacuum photon modes and properties of patterned surfaces is currently being established on solid theoretical grounds. Based on these foundations, the manipulation of quantum vacuum photon modes in a nanostructured cavity is theoretically shown to be able to turn the Lifshitz-van der Waals forces from attractive to repulsive regime. Since this concept relies on surface nanopatterning instead of chemical composition changes, it drastically relaxes the usual conditions for achieving repulsive Lifshitz-van der Waals forces. As a case study, the potential interaction energy between a nanopatterned polyethylene slab and a flat polyethylene slab with water as intervening medium is calculated. Extremely small corrugations heights (less than ten nanometers) are shown to be able to turn the Lifshitz-van der Waals force from attractive to repulsive, the interaction strength being controlled by the corrugation height. This new approach could lead to various applications in surface science.