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Maximum Willis Coupling in Acoustic Scatterers
Li Quan, Younes Ra'di, Dimitrios Sounas +1
Willis coupling in acoustic materials defines the cross-coupling between strain and velocity, analogous to bianisotropic phenomena in electromagnetics. While these effects have bee…
Non-reciprocal Optical Mirrors Based on Spatio-Temporal Modulation
Romain Fleury, Dimitrios L. Sounas, Andrea Alu
The recent surge of interest in temporal modulation schemes to induce magnet-free non-reciprocity has inspired several exciting opportunities for photonic technology. Here, we inve…
Pseudo-Linear Time-Invariant Magnetless Circulators Based on Differential Spatiotemporal Modulation of Resonant Junctions
Ahmed Kord, Dimitrios L. Sounas, Andrea Alù
In this paper, we present voltage- and current-mode differential magnetless non-reciprocal devices obtained by pairing two single-ended (SE) circulators, each consisting of three f…
Magnetless Circulators Based on Spatiotemporal Modulation of Bandstop Filters in a Delta Topology
Ahmed Kord, Dimitrios L. Sounas, Andrea Alù
In this paper, we discuss the design rationale and guidelines to build magnet-less circulators based on spatio-temporal modulation of resonant junctions consisting of first-order b…
Meta-Gratings: Beyond the Limits of Graded Metasurfaces for Wavefront Control
Younes Ra'di, Dimitrios L. Sounas, Andrea Alu
Graded metasurfaces exploit the local momentum imparted by an impedance gradient to transform the impinging wavefront. This approach suffers from fundamental limits on the overall…
Static non-reciprocity in mechanical metamaterials
Corentin Coulais, Dimitrios Sounas, Andrea Alù
Reciprocity is a fundamental principle governing various physical systems, which ensures that the transfer function between any two points in space is identical, regardless of geom…