1,760 research outputs found
Bloch vector dependence of the plasma frequency in metallic photonic crystals
We show that the plasma frequency in wire photonic crystals depends upon the
Bloch vector. An accurate formula is given.Comment: to be published in Phys. Rev.
A Onelab model for the parametric study of mono-dimensional diffraction gratings
This document aims at presenting both theoretical and practical aspects of
the grating_2D Onelab model (available at
http://onelab.info/wiki/Diffraction_grating). This model applies to so-called
mono-dimensional grating, i.e. structures having one direction of invariance.
Various geometries and materials can be handled or easily added. The two
classical polarization cases, denoted here E// and H//, are addressed. The
output consists in a full energy balance of the problem computed from the field
maps. This model is based on free the GNU softwares Gmsh, GetDP and their
interface Onelab.Comment: arXiv admin note: text overlap with arXiv:1302.103
Transformation Optics, Generalized Cloaking and Superlenses
In this paper, transformation optics is presented together with a
generalization of invisibility cloaking: instead of an empty region of space,
an inhomogeneous structure is transformed via Pendry's map in order to give, to
any object hidden in the central hole of the cloak, a completely arbitrary
appearance. Other illusion devices based on superlenses considered from the
point of view of transformation optics are also discussed.Comment: 7 pages (two columns), 9 figures, to appear in IEEE Trans. Mag.,
invited paper in Compumag 2009 (Florianopolis, Brasil), corresponding slides
available on http://www.fresnel.fr/perso/nicolet
Metamaterials and the mathematical Science of invisibility
In this chapter, we review some recent developments in the field of
photonics: cloaking, whereby an object becomes invisible to an observer, and
mirages, whereby an object looks like another one (say, of a different shape).
Such optical illusions are made possible thanks to the advent of metamaterials,
which are new kinds of composites designed using the concept of
transformational optics. Theoretical concepts introduced here are illustrated
by finite element computations.Comment: This is a book chapter. 22 pages, 7 figure
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