Surface Roughness and Material Optical Properties Influence on Casimir/van der Waals and Capillary Surface Forces

P.J. van Zwol, G. Palasantzas*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)

Abstract

Theory calculations using the Lifshitz theory and atomic force microscopy force measurements show that Casimir/van der Weals dispersive forces have a strong dependence on material optical properties and surface roughness. At separations below 100 nm the roughness effect is manifested through a strong deviation from the normal scaling of the force with separation distance. Moreover, knowledge of precise optical properties of metals is very important for accurate force predictions rather than referring to idealized defect free material models. Finally, we compare the Casimir/van der Weals forces to capillary adhesive forces in order to illustrate their significance in stiction problems, which are important for motion analysis of microelectromechanical (MEMS) systems.

Original languageEnglish
Pages (from-to)358-362
Number of pages5
JournalAdvanced science letters
Volume3
Issue number4
DOIs
Publication statusPublished - Dec-2010

Keywords

  • MICROELECTROMECHANICAL SYSTEMS
  • ATTRACTIVE FORCES
  • ADHESION
  • LAYER

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