Encontrados 7 documentos, a visualizar página 1 de 1
Non-Hermitian linear electro-optic effect in three-dimensional materials
Morgado, Tiago A.; Rappoport, Tatiana Gabriela; Tsirkin, Stepan S.; Lannebère, Sylvain; Souza, Ivo; Silveirinha, Mário G.Here, we present an in-depth theoretical analysis of the linear electro-optic effect in low-symmetry three-dimensional (3D) conductive materials with large Berry curvature dipoles. Our study identifies two distinct kinetic contributions to the linear electro-optic effect: a gyrotropic Hermitian (conservative) piece and a non-Hermitian term that can originate optical gain. We concentrate on the study of 3D mater...
Engineering Transistorlike Optical Gain in Two-Dimensional Materials with Berry...
Rappoport, Tatiana G; Morgado, Tiago A.; Lannebère, Sylvain; Silveirinha, Mário G.Transistors are key elements of electronic circuits as they enable, for example, the isolation or amplification of voltage signals. While conventional transistors are point-type (lumped-element) devices, it may be interesting to realize a distributed transistor-type optical response in a bulk material. Here, we show that low-symmetry two-dimensional metallic systems may be the ideal solution to implement such a...
Experimental verification of magnetic near-field channeling using a helical-sha...
Morgado, Tiago A.; João, Guilherme; Pereira, Ricardo A. M.; Fernandes, David E.; Lannebère, SylvainThis article was published in Applied Physics Letters; 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 magnetic field of near-field sources with resolution well below the diffraction limit over a broad bandwidth. It is experimentally demonstrated that the helical-shaped wire medium...
A graphene inspired electromagnetic superlens
Lannebère, Sylvain; Silveirinha, Mário GIn this paper we propose a new paradigm to create superlenses inspired by n–p–n junctions of graphene.We show that by adjoining an n-type region and a p-type region with a crystal dislocation, it is possible to mimic the interaction of complementary Hamiltonians and achieve subwavelength imaging.We introduce an effective model of the system, and show that it predicts perfect lensing for both propagating and eva...
Photonic analogues of the Haldane and Kane-Mele models
Lannebère, Sylvain; Silveirinha, Mário G.The condensed matter Haldane and Kane-Mele models revolutionized the understanding of what is an “insulator,” as they unveiled novel classes of media that behave as metals near the surface, but are insulating in the bulk. Here, we propose exact electromagnetic analogues of these two influential models relying on a photonic crystal implementation of “artificial graphene” subject to an effective magnetic field. F...
Optical meta-atom for localization of light with quantized energy
Lannebère, Sylvain; Silveirinha, Mário G.Article in press in Nature Communications (29/09/2015). Attached: Supplementary Movies 1 and 2 (small size version); The capacity to confine light into a small region of space is of paramount importance in many areas of modern science. Here we suggest a mechanism to store a quantized 'bit' of light--with a very precise amount of energy--in an open core-shell plasmonic structure ('meta-atom') with a nonlinear op...
Hydrodynamic chronoamperometry for probing kinetics of anaerobic microbial meta...
Prévoteau, Antonin; Geirnaert, Annelies; Arends, Jan B. A.; Lannebère, Sylvain; Van de Wiele, Tom; Rabaey, KorneelMonitoring in vitro the metabolic activity of microorganisms aids bioprocesses and enables better understanding of microbial metabolism. Redox mediators can be used for this purpose via different electrochemical techniques that are either complex or only provide non-continuous data. Hydrodynamic chronoamperometry using a rotating disc electrode (RDE) can alleviate these issues but was seldom used and is poorly ...