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Force on an electric dipole near an ENZ interface

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Abstract

An electric dipole near a surface is subject to the electromagnetic force by its own reflected field. We have derived a closed-form expression for this force for the case of an epsilon-near-zero (ENZ) medium. This force is perpendicular to the surface, and it is repulsive. We show that this force is due to the evanescent reflected field. For a rotating dipole moment, there is also a lateral force, which, in the ENZ limit, is vanishing small. However, when a small amount of damping is present in the material, this force becomes comparable with the force component perpendicular to the surface.

© 2019 Optical Society of America

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