122 citations · 236 across the 6 of their papers we have counts for
6 papers
Energy transport and chaos in a one-dimensional disordered nonlinear stub lattice
Su Ho Cheong, Arnold Ngapasare, Vassos Achilleos +3
We investigate energy propagation in a one-dimensional stub lattice in the presence of both disorder and nonlinearity. In the periodic case, the stub lattice hosts two dispersive b…
Wave propagation in a strongly disordered 1D phononic lattice supporting rotational waves
A. Ngapasare, G. Theocharis, O. Richoux +2
We investigate the dynamical properties of a strongly disordered micropolar lattice made up of cubic block units. This phononic lattice model supports both transverse and rotationa…
Stealth acoustic materials
V. Romero-García, N. Lamothe, G. Theocharis +2
We report the experimental design of a 1D stealth acoustic material, namely a material that suppresses the acoustic scattering for a given set of incident wave vectors. The materia…
Chaos and Anderson Localisation in Disordered Classical Chains: Hertzian vs FPUT models
A. Ngapasare, G. Theocharis, O. Richoux +2
We numerically investigate the dynamics of an one-dimensional disordered lattice using the Hertzian model, describing a granular chain, and the Fermi-Pasta-Ulam-Tsingou model…
Non-Hermitian Acoustic Metamaterials: the role of Exceptional Points in sound absorption
V. Achilleos, G. Theocharis, O. Richoux +1
Effective non-Hermitian Hamiltonians are obtained to describe coherent perfect absorbing and lasing boundary conditions. PT -symmetry of the Hamiltonians enables to design configur…
Coherent Perfect Absorption induced by the nonlinearity of a Helmholtz resonator
V. Achilleos, O. Richoux, G. Theocharis
In this work, we analytically report Coherent Perfect Absorption induced by the acoustic nonlinear response of a Helmholtz Resonator side loaded to a waveguide. In particular, we s…