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Self-induced topological transitions and edge states supported by nonlinear staggered potentials
Yakir Hadad, Alexander B. Khanikaev, Andrea Alu
The canonical Su-Schrieffer-Heeger (SSH) model is one of the basic geometries that have spurred significant interest in topologically nontrivial bandgap modes with robust propertie…
Floquet Topological Insulators for Sound
Romain Fleury, Alex Khanikaev, Andrea Alu
The unique conduction properties of condensed matter systems with topological order have recently inspired a quest for similar effects in classical wave phenomena. Acoustic topolog…
Gradient Nonlinear Pancharatnam-Berry Metasurfaces
Mykhailo Tymchenko, J. Sebastiàn Gomez-Diaz, Jongwon Lee +3
We apply the Pancharatnam-Berry phase approach to plasmonic metasurfaces loaded by highly nonlinear multi-quantum well substrates, establishing a platform to control the nonlinear…
Aberration-Free Imaging Based on Parity-Time Symmetric Nonlocal Metasurfaces
Francesco Monticone, Constantinos A. Valagiannopoulos, Andrea Alu
Lens design for focusing and imaging has been optimized through centuries of developments; however, conventional lenses, even in their most ideal realizations, still suffer from fu…
Giant Photoresponsivity of Mid-Infrared Hyperbolic Metamaterials in the Quantum Regime
Pai-Yen Chen, Mehdi Hajizadegan, Maryam Sakhdari +1
We explore broadband, wide-angle mid-infrared rectification based on nanopatterned hyperbolic metamaterials (HMM), composed of two dissimilar metals separated by a sub-nanometer tu…
Nonlinear Processes in Multi-Quantum-Well Plasmonic Metasurfaces:Electromagnetic Response, Saturation Effects, Limits and Potentials
J. S. Gomez-Diaz, M. Tymchenko, J. Lee +2
Nonlinear metasurfaces based on coupling a locally enhanced plasmonic response to intersubband transitions of n-doped multi-quantum-wells (MQWs) have recently provided second-order…
Space-time gradient metasurfaces
Y. Hadad, D. L. Sounas, A. Alu
Metasurfaces characterized by a transverse gradient of local impedance have recently opened exciting directions for light manipulation at the nanoscale. Here we add a temporal grad…
-Symmetry-Induced Wave Confinement and Guiding in Epsilon-Near-Zero Metamaterials
Silvio Savoia, Giuseppe Castaldi, Vincenzo Galdi +2
Inspired by the parity-time symmetry concept, we show that a judicious spatial modulation of gain and loss in epsilon-near-zero metamaterials can induce the propagation of exponent…