The negative electromagnetic attractive forces arising from kinetic energy of conduction electrons in double-layer metallic nanowire arrays

The coupled-nanowire plasmatic resonances and very strong negative electromagnetic force between the double-layer metallic nanowire arrays is investigated theoretically. The negative electromagnetic force indicates attractive interaction between the metallic nanowires with the air-gap cavity local resonance effect. Plasmon resonances lead to extremely large localized field, thereby resulting in large mutual coupling forces between the double-layer metallic nanowire arrays. The light coupling into metallic microcavity can stimulate collective electron oscillations of plasmatic resonance, and cause the contraction of the negative pressure in metallic cavity wall. The electromagnetic field of the plasmatic resonance mode is mainly localized inside the air-gap region between the two wires.

► We model the double-layer metallic nanowire arrays which have the attractive and repulsive optical forces. ► We contrast the resonance behavior of the two different attractive and repulsive optical forces. ► We contrast the electromagnetic field patterns for the different resonance behavior. ► Light blend in microcavity can excite group electron oscillations and root short form of harmful strain in metallic hole wall. ► The kinetic energy spectra of the conduction electrons inside the metallic cavity walls is obtained.