Nonlocal homogenization model for a periodic array of epsilon-negative rods.
We propose an effective permittivity model to homogenize an array of long thin epsilon-negative rods arranged in a periodic lattice. It is proven that the effect of spatial dispersion in this electromagnetic crystal cannot be neglected, and that the medium supports dispersionless modes that guide the energy along the rod axes. It is suggested that this effect may be used to achieve subwavelength imaging at the infrared and optical domains. The reflection problem is studied in detail for the case in which the rods are parallel to the interfaces. Full wave numerical simulations demonstrate the validity and accuracy of the new model.
Silveirinha
Mário G
MG
Departamento de Eng. Electrotécnica da Universidade de Coimbra, Instituto de Telecomunicações, Pólo II, 3030 Coimbra, Portugal. mario.silveirinha@co.it.pt