A class of invisible inhomogeneous media and the control of electromagnetic waves

The paper is finally online! We studied scattering free media where one can control at will the intensity and/ or phase of the propagating electromagnetic field. We have been working on this for a little while with colleagues at the University of Exeter.

Here is the link to the publisher website, and the arXiv e-print.

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Abstract: We propose a general method to arbitrarily manipulate an electromagnetic wave propagating in a two-dimensional medium, without introducing any scattering. This leads to a whole class of isotropic spatially varying permittivity and permeability profiles that are invisible while shaping the field magnitude and/or phase. In addition, we propose a metamaterial structure working in the infrared that demonstrates deep sub-wavelength control of the electric field amplitude and strong reduction of the scattering. This work offers an alternative strategy to achieve invisibility with isotropic materials and paves the way for tailoring the propagation of light at the nanoscale

Paper published online

My paper on mode coupling has been published in Journal of Optics. It is available from the editor website or direct download.

Abstract: We develop a model for the coupling of quasi-normal modes in open photonic systems consisting of two resonators. By expressing the modes of the coupled system as a linear combination of the modes of the individual particles, we obtain a generalized eigenvalue problem involving small size dense matrices. We apply this technique to dielectric rod dimmer of rectangular cross section for transverse electric polarization in a two-dimensional setup. The results of our model show excellent agreement with full wave finite element simulations. We provide a convergence analysis, and a simplified model with a few modes to study the influence of the relative position of the two resonators. This model provides interesting physical insights on the coupling scheme at stake in such systems and pave the way for systematic and efficient design and optimization of resonances in more complicated systems, for applications including sensing, antennae and spectral filtering.

 

 

Oral presentation accepted for Metamaterials Congress 2016

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Good news, the abstract has been accepted for oral presentation in Metamaterial congress 2016, 17-22 Sept. in Crete. Here is the link for the abstract, and here is the presentation.
Abstract: We propose a general methodology to manipulate the amplitude of an electromagnetic wave in a pre-specified way, without introducing any scattering. This leads to a whole class of isotropic spatially varying permittivity and permeability profiles that are invisible to incident waves. The theory is illustrated through various numerical examples, including the non-magnetic case. The implementation of the required material properties using metamaterials is discussed, as well as extensions of the method for controlling the phase of electromagnetic fields.

 

Athena Days

athena-logo-62ddeI was kindly invited to attend a workshop organized by my former PhD advisers and colleagues in Fresnel Institute, Marseille. Those two days (25th-26th of June) were really interesting and exciting scientifically, focusing on quasi normal modes (QNM) and numerical methods in electromagnetism. I had a talk about QNM (mostly what I did for my PhD) and my latest work on QNM coupling. Here is my presentation. See you all next year!

Submitted paper

My latest work “A coupling model for quasi normal modes of photonic resonators” is under review for publication in Journal of Optics. Here is the arXiv link or you can download it directly here.figure3

Abstract: We develop a model for the coupling of quasi-normal modes in open photonic systems consisting of two resonators. By expressing the modes of the coupled system as a linear combination of the modes of the individual particles, we obtain a generalized eigenvalue problem involving small size dense matrices. We apply this technique to dielectric rod dimmer of rectangular cross section for Transverse Electric (TE) polarization in a two-dimensional (2D) setup. The results of our model show excellent agreement with full-wave finite element simulations. We provide a convergence analysis, and a simplified model with a few modes to study the influence of the relative position of the two resonators. This model provides interesting physical insights on the coupling scheme at stake in such systems and pave the way for systematic and efficient design and optimization of resonances in more complicated systems, for applications including sensing, antennae and spectral filtering.