Speaker: Alberto Razo

Date: May 20th 2025, 15:00 (GMT-6)

Auditorium Z of CUCEI.  (Youtube Link)         

Abstract

In a broad sense, the term wave localization refers to a phenomenon where waves are spatially confined in small regions of the space without any bounding material barriers. In this seminar, we will discuss two different physical collective mechanisms to spatially localize, and therefore, to control electromagnetic waves. Specifically, we will focus on the role of uncorrelated and correlated potentials (aperiodic Vogel spiral), as well as of topological effects to experimentally achieve wave confinement. Our experiments are performed using a microwave platform composed by small dielectric cylinders placed inside a cavity made of two metallic plates. The cavity implements a propagative wave system, where we can efficiently control the local permittivity by means of the cylinders acting as scatterers, or as an analogic tight-binding system, where, in this case, the dielectric cylinders play the role of resonators. Taken together, our results demonstrate that it is possible to model, control and localize electromagnetic waves not only within, but beyond Anderson's conception..