133 citations · 749 across the 17 of their papers we have counts for
17 papers
Nonreciprocal scattering of elastic waves at time interfaces induced by spatiotemporal modulation
Yingrui Ye, Chunxia Liu, Alessandro Marzani +3
Spatiotemporally modulated elastic metamaterials have garnered increasing interest for their potential applications in nonreciprocal wave devices. Most existing studies, however, f…
Non-Local Elastic Lattices with -Symmetry and Time Modulation: From Perfect Trapping to the Wave Boomerang Effect
Emanuele Riva
Wave motion is fundamentally constrained by the dispersion properties of the medium, often making it challenging -- or even impossible -- to guide wave packets along desired trajec…
Enhanced Sensitivity and Wave-Structure Interaction in Nonsingular Flat-Band Lattices with Compact Localized States
Emanuele Riva, Jacopo Marconi, Francesco Braghin
This paper investigates the dynamics of compact localized modes in one-dimensional flat-band elastic lattices. Flat dispersion arises from destructive interference between neighbor…
Creating compact localized modes for robust sound transport via singular flat band engineering
Riva Emanuele, Federico Bellinzoni, Francesco Braghin
We experimentally demonstrate the emergence of flat-band-induced compact-localized modes in acoustic Kagome lattices. Compact localized states populate singular dispersion bands ch…
Controlling surface acoustic waves (SAWs) via temporally graded metasurfaces
Jonatha Santini, Xingbo Pu, Antonio Palermo +2
In this manuscript, the temporal rainbow effect for surface acoustic waves (SAW) is illustrated through a temporal analog of space metagradings. We show that a time-modulated array…
Elastic Temporal Waveguiding
Jonatha Santini, Emanuele Riva
We provide a theoretical framework to mold time-modulated lattices with frequency conversion and wave-steering capabilities. We initially focus on 1D lattices, whereby a sufficient…
A Graded Metamaterial for Broadband and High-capability Piezoelectric Energy Harvesting
Bao Zhao, Henrik R. Thomsen, Jacopo M. De Ponti +5
This work studies a broadband graded metamaterial, which integrates the piezoelectric energy harvesting function targeting low-frequency structural vibrations, lying below 100 Hz.…
Harnessing -symmetry in non-Hermitian stiffness-modulated waveguides
Emanuele Riva
The recent progress in the context of elastic metamaterials and modulated waveguides with digitally controllable properties has opened new pathways to overcome the limitations dict…
Elastic three-dimensional metaframe for selective wave filtering and polarization control
Jacopo M. De Ponti, Emanuele Riva, Francesco Braghin +1
We experimentally achieve selective wave filtering and polarization control in a three-dimensional elastic frame embedding local resonators. By connecting multi-resonating elements…
Adiabatic edge-to-edge transformations in time-modulated elastic lattices and non-Hermitian shortcuts
Emanuele Riva, Gianmaria Castaldini, Francesco Braghin
The temporal modulation of a relevant parameter can be employed to induce modal transformations in Hermitian elastic lattices. When this is combined with a proper excitation mechan…
Selective mode conversion and rainbow trapping via graded elastic waveguides
Jacopo M. De Ponti, Luca Iorio, Emanuele Riva +3
We experimentally achieve wave mode conversion and rainbow trapping in an elastic waveguide loaded with an array of resonators. Rainbow trapping is a phenomenon that induces wave c…
Experimental observation of temporal pumping in electro-mechanical waveguides
Yiwei Xia, Emanuele Riva, Matheus I. N. Rosa +4
We experimentally demonstrate temporal pumping of elastic waves in an electromechanical waveguide. An aluminum beam covered by an array of piezoelectric patches connected to shunt…
Experimental investigation of amplification, via a mechanical delay-line, in a rainbow-based metasurface for energy harvesting
Jacopo M. De Ponti, Andrea Colombi, Emanuele Riva +4
We demonstrate that a rainbow-based metasurface, created by a graded array of resonant rods attached to an elastic beam, operates as a mechanical delay-line by slowing down surface…
Adiabatic pumping via avoided crossings in stiffness modulated quasiperiodic beams
Emanuele Riva, Vito Casieri, Ferruccio Resta +1
In this manuscript we report on adiabatic pumping in quasiperiodic stiffness modulated beams. We show that distinct topological states populating nontrivial gaps can nucleate avoid…
Edge States and Topological Pumping in Stiffness Modulated Elastic Plates
Emanuele Riva, Matheus I. N. Rosa, Massimo Ruzzene
We demonstrate that modulations of the stiffness properties of an elastic plate along a spatial dimension induce edge states spanning non-trivial gaps characterized by integer valu…
Experimental observation of non-reciprocal band-gaps in a space-time modulated beam using a shunted piezoelectric array
Jacopo Marconi, Emanuele Riva, Matteo Di Ronco +3
In this work we experimentally achieve 1 kHz-wide directional band-gaps for elastic waves spanning a frequency range from approximately 8 to 11 kHz. One-way propagation is induced…
Non-reciprocal wave propagation in discretely modulated spatiotemporal plates
Emanuele Riva, Matteo Di Ronco, Gabriele Cazzulani +1
We investigate non-reciprocal wave propagation in spatiotemporal phononic plates. In particular, the first goal of this manuscript is to present a general formulation of the Plane…