Plenary speakers

As in the previous editions of the Symposium, 4 plenary talks will be given by international renowned researchers (ECI or senior). We will have the pleasure to host:

Dr. Agnès MAUREL, Institut Langevin, ESPCI (FR)

Title: Acoustic analog of Autler-Townes Splitting and application to perfect resonant absorption of guided water waves

Abstract:

Our talk will focus on the acoustic analogue of the Autler-Townes splitting, in a configuration where two channels supporting quarter-wave resonances are closely spaced and interact via the evanescent field. We will present the scattering properties of this unique resonator connected to a waveguide in the cases where the two channels are tuned (identical) and detuned (slightly asymmetric). In the detuned case, we will demonstrate that by adjusting the geometry of the resonator, one can easily bring the reflection and transmission zeros to the same position (in the complex plane of wave numbers). An application of this property to the perfect absorption of surface waves will be presented.

Curriculum Vitæ:

Agnes Maurel is a research director at CNRS and conducts her research at the Langevin Institute in Paris. She studies wave propagation in complex media in the fields of waves covering acoustics, electromagnetism, elasticity, and water surface waves. In recent years, her research has focused on the modeling of microstructured materials, which includes metamaterials and metasurfaces.

Pr. Ada Amendola, University of Salerno (IT)

Title: An analytic study on the properties of solitary waves traveling on tensegrity-like lattices

Abstract:

This study develops an analytic study on the existence and properties of solitary waves on 1D chains of lumped masses and nonlinear springs, which exhibit a mechanical response similar to that of tensegrity prisms with locking-type response under axial loading. Making use of the Weierstrass’ theory of 1D Lagrangian conservative systems, I will show that such waves exist and that their shapes depend on the wave speed. A progressive localization of the traveling pulses in narrow regions of space is observed as the wave speed increases up to a limit value. A comparative analysis illustrates that this study is able to capture the wave dynamics observed in previous numerical results on tensegrity mass-spring chains.

Curriculum Vitæ:

Pr. Ada Amendola is an Associate Professor at the University of Salerno, Department of Civil Engineering.

Her current research activities are devoted to the computational design, modeling and manufacturing of multiscale innovative materials and structures in engineering fields where current knowledge of such systems is only partial. She studies lattice structures at different scales, to form cellular solids; devices; fibers and fabrics; and building-scale structures.

A modeling research line of her research project studies the effects of internal and external prestress on nonlinear lattice mechanics, with the aim of designing arbitrary lattice behaviors. Material-scale applications of multiscale lattices deal with novel dynamic devices and hierarchical composite materials. A structure-scale application exploits lattices with morphing abilities to design adaptable envelopes for energy efficient buildings.

Pr. Michael Haberman, The University of Texas, Austin (US)

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Title: Acoustic wave interaction with spatiotemporally modulated metasurfaces and domains

Abstract:

Acoustic and elastic metamaterials with space- and time-dependent material properties have recently received significant attention as a means to realize systems that induce nonreciprocal wave propagation in the bulk or enable frequency and mode conversion of fields scattered from metasurfaces. This work will introduce the fundamentals of acoustic wave propagation in spatiotemporally modulated (STM) materials including space-symmetry breaking of the dispersion relations for freely propagating waves, reflection and transmission at time boundaries, and frequency and wavenumber conversion at interfaces between unmodulated and STM media. The talk will include specific examples of the use of STM to control scattered acoustic waves, namely diffusive and nonreciprocal scattering from flat surfaces via STM of the input admittance and a coupled-mode technique to determine scattering from finite inhomogeneity whose properties are general functions of space and time. In the latter example, we will consider canonical geometries where the analytical solution is known for the unmodulated case which can be used as basis functions to construct the fields within the STM domain. Computations of the scattered field directivity pattern will then be carried out as a function of the modulation parameters to determine cases that yield a large degree of control over the scattered field directivity pattern for each generated frequency harmonic.

Curriculum Vitæ:

Dr. Haberman is an Associate Professor in the Walker Department of Mechanical Engineering at the University of Texas (UT) at Austin with a joint appointment at the Applied Research Laboratories UT Austin. He received his Ph.D. and Master of Science degrees in Mechanical Engineering from the Georgia Institute of Technology in 2007 and 2001, respectively, and received a Diplôme de Doctorat in Engineering Mechanics from the Université de Lorraine in Metz, France in 2006. His undergraduate work in Mechanical Engineering was done at the University of Idaho, where he received a B.S. in 2000. Dr. Haberman's research interests are centered on elastic and acoustic wave propagation in complex media, acoustic metamaterials, new acoustic transduction materials, ultrasonic nondestructive testing, and vibro-acoustic transducers. He has worked extensively on the modeling and characterization of acoustic metamaterials, composite materials, and the multi-objective design of acoustical materials. His research finds application in technical areas that include the absorption and isolation of acoustical, vibrational, and impulsive energy using negative stiffness and Willis coupling, devices that make use of non-reciprocal acoustic and elastic wave phenomena, and condition monitoring of lithium-ion batteries using ultrasonic methods.

Pr. Kosmas Tsakmakidis, National and Kapodistrian University of Athens (GR)

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Title: Topological trapped-rainbow and nonreciprocal guides beyond the time-bandwidth limit

Abstract:

Topologically protected wave transport has recently emerged as an effective means to address a recurring problem hampering the field of ‘slow light’ for the past two decades: Its keen sensitivity to disorders and structural imperfections. With it, there has been renewed interest in efforts to overcome the delay-time–bandwidth limitation usually characterizing slow-light devices, on occasion thought to be a ‘fundamental limit’. Our talk will overview latest developments and point out important new functionalities that overcoming the limit can enable.

Curriculum Vitæ:

Kosmas L. Tsakmakidis obtained his Diploma degree in Electrical & Computer Engineering from the Aristotle University of Thessaloniki, Greece (2002), his Master of Research (MRes) in Electronic Engineering from the 5*A-ranked Advanced Technology Institute (ATI) of the University of Surrey, UK (2003), and his Doctorate degree (PhD) in Applied Physics and Engineering from ATI, University of Surrey (2009).

During 2008-2013 he was a Royal Academy of Engineering/EPSRC research fellow, first at the ATI, University of Surrey (2008-2010), and then in the Condensed Matter Theory Group, Department of Physics, of Imperial College London (2011-2013). He subsequently worked as a senior postdoctoral research fellow in the Department of Mechanical Engineering of the University of California, Berkeley (2014-2015), a Eugen Lommel postdoctoral fellow at the Max Planck – University of Ottawa Center for Extreme and Quantum Photonics & the Department of Physics, University of Ottawa (Canada, 2015-2016), and as an EPFL Fellow in the Bioengineering Department, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne (Switzerland, 2017-2018). Since March 2018 he is an assistant professor (tenured since Nov. 2021) in the Department of Physics, Section of Condensed Matter Physics, of the National and Kapodistrian University of Athens (NKUA), Greece.

He specializes in condensed matter photonics, nanophotonics, metamaterials, plasmonics, ‘slow’ and ‘fast’ light, active/lasing nanostructures, computational physics, invisibility cloaking, and light-based chiral sensing schemes, where he has made a number of seminal contributions and introduced key concepts and results in the fields [e.g., K. L. Tsakmakidis, et al., Nature 450, 397 (2007); K. L. Tsakmakidis, et al., Phys. Rev. Lett. 112, 167401 (2014); K. L. Tsakmakidis, et al., Science 356, 1260 (2017); K. L. Tsakmakidis, et al., Science 358, eaan5196 (2017)]. He is the originator of the broad, multidisciplinary applied-physics research topic known as the ‘rainbow effect,’ referring to broadband slow and stopped waves. For his work, he has received awards by the Royal Academy of Engineering (UK, 2008), the Institute of Physics (best PhD Thesis prize, 2010), the UK Parliament (2010), the University of Surrey (Researcher of the Year, 2010), the Academy of Athens (Lycurgus Award, 2021), and the National and Kapodistrian University of Athens (2023) [1, 2]. His work is often covered by physics-dedicated and general-media outlets (e.g., APS Physics, Physics World, Physics Today, BBC, The Economist).

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