292 citations · 792 across the 9 of their papers we have counts for
9 papers
Nonlocal elastic metasurfaces: enabling broadband wave control via intentional nonlocality
Hongfei Zhu, Timothy F. Walsh, Bradley H. Jared +1
While elastic metasurfaces offer a remarkable and very effective approach to the subwalength control of stress waves, their use in practical applications is severely hindered by in…
Total-internal-reflection elastic metasurfaces: design and application to structural vibration isolation
Hongfei Zhu, Timothy F. Walsh, Fabio Semperlotti
This letter presents the concept of Total Internal Reflection metasurface (TIR-MS) which supports the realization of structure-embedded subwavelength acoustic shields for elastic w…
Design and Experimental Observation of Valley-Hall Edge States in Diatomic-Graphene-like Elastic Waveguides
Hongfei Zhu, Ting-Wei Liu, Fabio Semperlotti
We report on the design and experimental validation of a two-dimensional phononic elastic waveguide exhibiting topological Valley-Hall edge states. The lattice structure of the wav…
Double-zero-index structural waveguides
Hongfei Zhu, Fabio Semperlotti
We report on the theoretical and experimental realization of a double-zero-index elastic waveguide and on the corresponding acoustic cloacking and supercoupling effects. The propos…
Two-Dimensional Structure-Embedded Acoustic Lenses based on Periodic Acoustic Black Holes
Hongfei Zhu, Fabio Semperlotti
Recent studies have introduced a new class of two-dimensional acoustic metamaterials whose dispersion and propagation properties results from the use of geometric inhomogeneities i…
Anomalous refraction of acoustic guided waves in solids with geometrically tapered metasurfaces
Hongfei Zhu, Fabio Semperlotti
The concept of metasurface has recently opened new exciting directions to engineer the refraction properties in both optical and acoustic media. Metasurfaces are typically designed…
Phononic Thin Plates with Embedded Acoustic Black Holes
Hongfei Zhu, Fabio Semperlotti
We introduce a class of two-dimensional non-resonant single-phase phononic materials and investigate its peculiar dispersion characteristics. The material consists of a thin plate-…
A passively tunable non-resonant acoustic metamaterial lens for selective ultrasonic excitation
Hongfei Zhu, Fabio Semperlotti
In this paper, we present an approach to ultrasonic beam-forming and beam-steering in structures based on the concept of embedded non-resonant acoustic metamaterial lenses. The len…
Achieving Selective Damage Interrogation and Sub-Wavelength Resolution in Thin Plates with Embedded Metamaterial Acoustic Lenses
Fabio Semperlotti, Hongfei Zhu
In this study, we present an approach to ultrasonic beamforming and high resolution identification of acoustic sources having critical implications for structural health monitoring…