Sebastiano Cominelli
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View article: Non-dispersive graded impedance acoustic lenses
Non-dispersive graded impedance acoustic lenses Open
Lenses are typically based on refractive index profiles derived from the geometric approximation of high-frequency waves, yet the critical issue of impedance mismatch is often neglected. Mismatched devices suffer from unwanted reflections …
View article: High bulk modulus pentamodes: the three-dimensional metal water
High bulk modulus pentamodes: the three-dimensional metal water Open
Despite significant advances in the field of phononic crystals, the development of acoustic metafluids that replicate the behaviour of liquids in three dimensions remains elusive. For instance, water – the quintessential pentamode (PM) mat…
View article: Optimal Design of Broadband, Low-Directivity Graded Index Acoustic Lenses for Underwater Applications
Optimal Design of Broadband, Low-Directivity Graded Index Acoustic Lenses for Underwater Applications Open
Manipulating underwater pressure waves is crucial for marine exploration, as electromagnetic signals are strongly absorbed in water. However, the multi-path phenomenon complicates the accurate capture of acoustic waves by receivers. Althou…
View article: High Bulk Modulus Pentamodes: the Three-Dimensional Metal Water
High Bulk Modulus Pentamodes: the Three-Dimensional Metal Water Open
Despite significant advances in the field of phononic crystals, the development of acoustic metafluids that replicate the behaviour of liquids in three dimensions remains elusive. For instance, water - the quintessential pentamode (PM) mat…
View article: Isospectral open cavities and gratings
Isospectral open cavities and gratings Open
Open cavities are often an essential component in the design of ultra-thin subwavelength metasurfaces and a typical requirement is that cavities have precise, often low frequency, resonances while simultaneously being physically compact. T…
View article: Design of an Acoustic Luneburg Lens via Topology Optimization of Pentamode Lattice
Design of an Acoustic Luneburg Lens via Topology Optimization of Pentamode Lattice Open
This study introduces an automated topology optimization approach for designing a pentamode metamaterial. We validate the method designing a graded index (GRIN) 2D Luneburg lens for underwater acoustics. This approach ensures each cell mee…
View article: Isospectral open cavities and gratings
Isospectral open cavities and gratings Open
Open cavities are often an essential component in the design of ultra-thin subwavelength metasurfaces and a typical requirement is that cavities have precise, often low frequency, resonances whilst simultaneously being physically compact. …
View article: Optimal Strategies to Steer and Control Water Waves
Optimal Strategies to Steer and Control Water Waves Open
In this paper, we propose a novel approach for controlling surface water waves and their interaction with floating bodies. We consider a floating target rigid body surrounded by a control region where we design three control strategies of …
View article: Design of arbitrarily shaped acoustic cloaks through partial differential equation-constrained optimization satisfying sonic-metamaterial design requirements
Design of arbitrarily shaped acoustic cloaks through partial differential equation-constrained optimization satisfying sonic-metamaterial design requirements Open
We develop an optimization framework for the design of acoustic cloaks, with the aim of overcoming the limitations of usual transformation-based cloaks in terms of microstructure complexity and shape arbitrarity of the obstacle. This is ac…
View article: Design of arbitrarily shaped acoustic cloaks through PDE-constrained optimization satisfying sonic-metamaterial design requirements
Design of arbitrarily shaped acoustic cloaks through PDE-constrained optimization satisfying sonic-metamaterial design requirements Open
We develop an optimization framework for the design of acoustic cloaks, with the aim of overcoming the limitations of usual transformation-based cloaks in terms of microstructure complexity and shape arbitrarity of the obstacle. This is ac…