Negative index effects from a homogeneous positive index prism

Cellular structured negative index metamaterials in the form of a right triangular prism have often been tested by observing the refraction of a beam across the prism hypotenuse which is serrated in order to conform to the cell walls. We show that not only can this negative index effect be obtained...

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Bibliographic Details
Main Authors: Marcus Sherman W., Epstein Ariel
Format: Article
Language:English
Published: EDP Sciences 2017-01-01
Series:EPJ Applied Metamaterials
Online Access:https://doi.org/10.1051/epjam/2017011
Description
Summary:Cellular structured negative index metamaterials in the form of a right triangular prism have often been tested by observing the refraction of a beam across the prism hypotenuse which is serrated in order to conform to the cell walls. We show that not only can this negative index effect be obtained from a homogeneous dielectric prism having a positive index of refraction, but in addition, for sampling at the walls of the cellular structure, the phase in the material has the illusory appearance of moving in a negative direction. Although many previous reports relied on refraction direction and phase velocity of prism structures to verify negative index design, our investigation indicates that to unambiguously demonstrate material negativity additional empirical evidence is required.
ISSN:2272-2394