Ultrathin metallic coatings can induce quantum levitation between nanosurfaces

作者：Bostrom Mathias^*; Ninham Barry W; Brevik Iver; Persson Clas; Parsons Drew F; Sernelius Bo E

来源：Applied Physics Letters, 2012, 100(25): 253104.

DOI：10.1063/1.4729822

There is an attractive Casimir-Lifshitz force between two silica surfaces in a liquid (bromobenze or toluene). We demonstrate that adding an ultrathin (5-50 angstrom) metallic nanocoating to one of the surfaces results in repulsive Casimir-Lifshitz forces above a critical separation. The onset of such quantum levitation comes at decreasing separations as the film thickness decreases. Remarkably, the effect of retardation can turn attraction into repulsion. From that we explain how an ultrathin metallic coating may prevent nanoelectromechanical systems from crashing together.

• 出版日期2012-6-18