43 citations · 199 across the 14 of their papers we have counts for
14 papers
Experimental verification of magnetic near-field channeling using a helical-shaped wire medium lens
Tiago A. Morgado, Guilherme L. João, Ricardo A. M. Pereira +2
We experimentally verify that a magnetic uniaxial wire medium lens consisting of a racemic array of helical-shaped metallic wires may enable channeling the normal component of the…
Enhancing the Directional Violation of Kirchhoff's Law of Thermal Radiation with a Nonreciprocal Wire Medium
David E. Fernandes, Mário G. Silveirinha
In this work, we develop a homogenization model to determine the effective response of a metallic nanowire array embedded in an electric gyrotropic material. We study the interacti…
Effective Medium Model for Graphene Superlattices with Electrostatic and Magnetic Vector Potentials
David E. Fernandes
In this article we develop an effective medium model to characterize the electron wave propagation in graphene based nanostructures with an electrostatic and magnetic vector potent…
Nonreciprocal and non-Hermitian material response inspired by semiconductor transistors
Sylvain Lannebère, David E. Fernandes, Tiago A. Morgado +1
Here, inspired by the operation of conventional semiconductor transistors, we introduce a novel class of bulk materials with nonreciprocal and non-Hermitian electromagnetic respons…
Experimental Verification of Ill-defined Topologies and Energy Sinks in Electromagnetic Continua
David E. Fernandes, Ricardo A. M. Pereira, Sylvain Lannebère +2
In this article, it is experimentally verified that nonreciprocal photonic systems with a continuous translation symmetry may have an ill-defined topology. The topological classifi…
Role of Time-Reversal Symmetry in the Dynamical Response of "One-Way" Nonlinear Devices
David E. Fernandes, Mário G. Silveirinha
We study the role of time-reversal symmetry on the dynamical response of nonlinear optical systems that behave as unidirectional ("one-way") devices. It is shown that lossless nonl…
Topological pumping in photonic systems
Solange V. Silva, David E. Fernandes, Tiago A. Morgado +1
The topology of typical Chern insulators is rooted in the periodicity of the system along two directions of real-space. In this article, we depart from this standard concept and de…
Topological origin of electromagnetic energy sinks
David E. Fernandes, Mário G. Silveirinha
It was recently highlighted that nonreciprocal surface waves can be stopped in suitably designed waveguides, leading to the formation of hotspots wherein the electromagnetic fields…
Asymmetric Transmission and Isolation in Nonlinear Devices: Why They Are Different
David E. Fernandes, Mário G. Silveirinha
Here, we highlight the fundamental differences between nonlinear two-port devices with strongly asymmetric transmission responses and "isolators". We use a mushroom-structure loade…
Bistability in mushroom-type metamaterials
David E. Fernandes, Mário G. Silveirinha
Here, we study the electromagnetic response of asymmetric mushroom-type metamaterials loaded with nonlinear elements. It is shown that near a Fano resonance these structures may ha…
On Hopf Algebras over quantum subgroups
Gaston Andres Garcia, Joao Matheus Jury Giraldi
Using the standard filtration associated with a generalized lifting method, we determine all finite-dimensional Hopf algebras over an algebraically closed field of characteristic z…
Time Evolution of Electron Waves in Graphene Superlattices
David E. Fernandes, Manuel Rodrigues, Gabriel Falcão +1
The time evolution of electron waves in graphene superlattices is studied using both microscopic and 'effective medium' formalisms. The numerical simulations reveal that in a wide…
Analytical solution for the stopping power of the Cherenkov radiation in a uniaxial nanowire material
Tiago A. Morgado, David E. Fernandes, Mário G. Silveirinha
We derive closed analytical formulae for the power emitted by moving charged particles in a uniaxial wire medium by means of an eigenfunction expansion. Our analytical expressions…
Optical Tractor Beam with Chiral Light
David E. Fernandes, Mário G. Silveirinha
We suggest a novel mechanism to induce the motion of a chiral material body towards an optical source. Our solution is based on the interference between a chiral light beam and its…