Said Zouhdi

Advances in electromagnetics of complex media and metamaterials

I. General Aspects of Complex Media and Metamaterials.- Electromagnetic Emergence in Metamaterials. Deconstruction of Terminology of Complex Media.- Ideas for Potential Applications of Metamaterials with Negative Permittivity and Permeability.- Frequency Response Engineering of Magnetic Composite Materials.- A Flavour of Constitutive Relations: The Linear Regime.- II. Metamaterials With Negative Parameters.- Electrodynamics of Media with Simultaneously Negative Electric Permittivity and Magnetic Permeability.- Modelling and Microwave Properties of Artificial Materials with Negative Parameters.- On the Electromagnetic Modelling of Left-Handed Metamaterials.- III. Photonic Band Gap Materials.- Controllable Semiconductor Photonic Band Gap Structures.- Photonic Band Gap Effects in Magnetic Film with Periodically Striped-Domain Structure.- Simulation of Finite Photonic Crystals made of Biisotropic or Chiral Material. Using the Method of Auxiliary Sources.- IV. Analysis And Modelling Of Bianisotropic Structures.- Propagation of Electromagnetic Waves in Artificial Anisotropie Uniform and Twisted Omega-Structures.- A Review of Homogenization Studies for Biaxial Bianisotropic Materials.- Dispersion Properties of Stop-Band Structures from Thin Metallic Spirals.- Effective Electron Model of the Wire Helix Excitation at Microwaves: First Step to Optimization of Pitch Angle of Helix.- V. Advanced Computational Methods For Electromagnetic Waves Interaction With Metamaterials.- Transmission and Reflection of Electromagnetic Waves by the Plane Stratified Structures Possessing Gyrotropic Properties.- Selective Reflection at an Oblique Incidence of Electromagnetic Waves onto Stratified Periodic Gyrotropic Structures.- Resonances of Closed Modes in Thin Arrays of Complex Particles.- Surface and Leaky Modes of Multilayered Omega Structures.- The Competition of Bragg Reflection and Fresnels Reflection of Electromagnetic Waves in the Artificial Helicoidal Bianisotropic Media with Local Chirality.- Use of Contemporary Mathematical Applications for Exact Solution of Light Propagation Problem in Layered Media. Propagation and Scattering.- VI. Heterogeneous Materials and Wave Localization.- On Electrodynamics of One-Dimensional Heterogeneous System Beyond Homogenization Approximation.- Localized Electromagnetic and Elastic Fields with Applications to Control Laser Radiation.- Excitonic Composites.- Optical Anisotropy of the Crystals at the Nonuniform Fields.- VII. Applications of Complex Media and Other Metamaterials.- Self-Adaptive Material Systems.- Electromagnetic Field Solution in Curved Structures with Local Bianisotropic Loading Media.- Dielectric Substrates Anisotropy Effects on the Characteristics of Microstrip Structures.- Theoretical and Experimental Limitations of Chiral Microwave Absorbers.- List of Contributors.

Metamaterials and Plasmonics: Fundamentals, Modelling, Applications

Preface. General Aspects Of Metamaterials And Plasmonics. Handedness in Plasmonics: Electrical Engineers Perspective A. Sihvola, S. Zouhdi.- Bounds on Metamaterials - Theoretical and Experimental Results G. Kristensson et al.- Transformation Media And Cloaking. Plasmonic Cloaks A. Alu and N. Engheta.- Geometrical Transformations for Numerical Modelling and for New Material Design in Photonics A. Nicolet et al.- Transformation and Moving Media: A Unified Approach Using Geometric Algebra M A. Ribeiro and C. R. Paiva.- Effective Medium Modeling. Homogenization of Split-Ring Arrays, Seen as the Exploitation of Translational Symmetry A. Bossavit.- Mixing Formulas and Plasmonic Composites H. Wallen et al.- Applications: Antennas, Absorbers. Applications of EBG in Low Profile Antenna Designs: What Have We Learned? Y. Rahmat-Samii and F. Yang.- Negative Index Metamaterial Lens for the Scanning Angle Enhancement of Phased-Array Antennas T. Lam et al.- Application of Wire Media in Antenna Technology S.Hrabar.- Optimization of Radar Absorber Structures using Genetic Algorithms N. Lassouaoui et al.- Design of Metamaterial-Based Resonant Microwave Absorbers with Reduced Thickness and Absence of a Metallic Backing F Bilotti and L. Vegni.- Metamaterial Elements And Components. Dual-Mode Metamaterial-Based Microwave Components D. S. Goshi et al.- Chiral Swiss Rolls M C. K. Wiltshire.- Trapped-Mode Resonances in Planar Metamaterials with High Structural Symmetry S. Prosvirnin et al.- Fabricating Plasmonic Components for Nano- and Meta-Photonics A. Boltasseva et al.- Line Source Excitation ofan Array of Circular Metamaterial Cylinders: Boundary Value Solution and Applications B. H. Henin et al.- Surfaces And Planar Structures. Analytical Modeling of Surface Waves on High Impedance Surfaces A. B. Yakovlev et al.- Migration and Collision of Magnetoplasmon Modes in Magnetised Planar Semiconductor-Dielectric Layered Structures A. G.Schuchinsky and X. Yan.- Transmission Lines And Waveguides. Dispersion Engineering in Resonant Type Metamaterial Transmission Lines and Applications J. Bonache et al.- Compact Dual-band Rat-Race Coupler Based on a Composite Right/Left Handed Transmission Line X. Hu and S.He.- Dispersion and Losses in Metamaterial DNG H-Guides A. L. Topa et al.- List of Contributors.

Modified Spherical Wave Functions With Anisotropy Ratio: Application to the Analysis of Scattering by Multilayered Anisotropic Shells

We describe a novel and rigorous vector eigenfunction expansion of electric-type Greens dyadics for radially multi- layered uniaxial anisotropic media in terms of the modified spherical vector wave functions, which can take into account the effects of anisotropy ratio systematically. In each layer, the material constitutions e and epsiv macrmu macr are tensors and distribution of sources is arbitrary. Both the unbounded and scattering dyadic Greens functions (DGFs) for rotationally uniaxial anisotropic media are derived in spherical coordinates (r, thetas, phi). The coefficients of scattering DGFs, based on the coupling recursive algorithm satisfied by the coefficient matrix, are derived and expressed in a compact form. With these DGFs obtained, the electromagnetic fields in each layer are straightforward once the current source is known. A specific model is proposed for the scattering and absorption characteristics of multilayered uniaxial anisotropic spheres, and some novel performance regarding anisotropy effects is revealed.

Resonances of Closed Modes in Thin Arrays of Complex Particles

Numerical analysis of the reflection properties of double-periodic thin arrays is carried out. This analysis indicates the presence of extremely high quality band stop and band pass resonances due to the excitation of non-symmetric current mode.

Theoretical realization of robust broadband transparency in ultrathin seamless nanostructures by dual blackbodies for near infrared light

We propose a counter-intuitive mechanism of constructing an ultrathin broadband transparent device with two perfect blackbodies. By introducing hybridization of plasmon modes, resonant modes with different symmetries coexist in this system. A broadband transmission spectrum in the near infrared regime is achieved through controlling their coupling strengths, which is governed by the thickness of high refractive index layer. Meanwhile, the transparency bandwidth is found to be tunable in a large range by varying the geometric dimension. More significantly, from the point view of applications, the proposed method of achieving broadband transparency can perfectly tolerate the misalignment and asymmetry of periodic nanoparticles on the top and bottom, which is empowered by the unique dual of coupling-in and coupling-out processes within the pair of blackbodies. Moreover, roughness has little influence on its transmission performance. According to the coupled mode theory, the distinguished transmittance performance is physically interpreted by the radiative decay rate of the entire system. In addition to the feature of uniquely robust broadband transparency, such a ultrathin seamless nanostructure (in the presence of a uniform silver layer) also provides polarization-independent and angle-independent operations. Therefore, it may power up a wide spectrum of exciting applications in thin film protection, touch screen techniques, absorber-emitter transformation, etc.

Homogenization of 3-D Periodic Bianisotropic Metamaterials

A novel homogenization technique, combining an asymptotic multiscale method with wave-field conception, is proposed for computing the quasi-static effective parameters of three-dimensional lattices of general bianisotropic composite materials. This technique is based on the decomposition of the fields into an averaged nonoscillating part and a corrected term with microoscillation. This paper provides an original and accurate way to model the electromagnetic fields in fine microstructures of bianisotropic particles with complex inclusion shapes when the wavelength is larger than the periodicity of the microstructure. The effects of the interaction between edges and corners of adjacent inclusions on the macroscopic effective parameters have been studied, and numerical results and verifications have been presented

Design of an ultrathin broadband transparent and high-conductive screen using plasmonic nanostructures

In this Letter, we present a new type of ultrathin antireflection transparent and high-conductive screen based on plasmonic nanostructures that does not suffer from high loss and thickness coating and also can be used as good conductive material due to super electrical conductivity of the component (noble metal). Low reflection and greatly enhanced transmissions over a broad spectral range are observed at optical telecommunication frequencies in arbitrary polarizations. The performance is almost insensitive of the angle of incidence.

Transformation-based spherical cloaks designed by an implicit transformation-independent method: theory and optimization

Based on the concept of the cloak generating function, we propose an implicit transformation-independent method for the required parameters of spherical cloaks without knowing the needed coordinate transformation beforehand. A non-ideal discrete model is used to calculate and optimize the total scattering cross-sections of different profiles of the generating function. A bell-shaped quadratic spherical cloak is found to be the best candidate, which is further optimized by controlling the design parameters involved. Such improved invisibility is steady even when the model is highly discretized.

Multi-Layered Arrays of Conducting Strips: Switchable Photonic Band Gap Structures

A numerical analysis of reflecting and transmitting properties of multi-layered structures composed of doubly pe- riodic arrays of metallic strips is presented in this paper. Array elements have been selected having the shape of the capital letters C, S and Ω. The metallic strips of arrays are placed on a thin dielectric substrate. These strips may include a con- centrated impedance loading. The interferences in the multi- layered array systems, due to multiple reflections of waves between the layers, combined with the resonance properties of single layers lead the structure to acquire typical properties of the photonic band gap (PBG) crystals.

Homogeneous and isotropic bends to tunnel waves through multiple different/equal waveguides along arbitrary directions

We propose a novel optical transformation to design homogeneous isotropic bends connecting multiple waveguides of different cross sections which can ideally tunnel the wave along any directions through multiple waveguides. First, the general expressions of homogeneous and anisotropic parameters in the bend region are derived. Second, the anisotropic material can be replaced by only two kinds of isotropic materials and they can be easily arranged in planarly stratified configuration. Finally, an arbitrary bender with homogeneous and isotropic materials is constructed, which can bend electromagnetic wave to any desired directions. To achieve the utmost aim, an advanced method is proposed to design nonmagnetic, isotropic and homogeneous bends that can bend waves along arbitrary directions. More importantly, all of the proposed bender has compact shape due to all flat boundaries, while the wave can still be perfectly tunneled without mode distortion. Numerical results validate these functionalities, which make the bend much easier in fabrication and application.