Gradient-index (GRIN) phononic crystals (PnCs) offer an excellent platform for various applications, including energy harvesting via wave focusing. Despite its versatile wave manipulation capability, the conventional design of GRIN PnCs has thus far been limited to relatively simple shapes, such as cir...
Phononic crystals and acoustic metamaterials are periodic structures whose effective properties can be tailored at will to achieve extreme control on wave propagation. Their refractive index is obtained from the homogenization of the infinite periodic system, but it is possible to locally change the ...
The method is based on the homogenization of phononic crystal plates, studied here as finite slices of phononic crystals. A complex unit cell is employed to simultaneously control the refractive index of the three modes, together with thickness variations of the plate, the system has therefore ...
Alternatively, metamaterials or phononic crystals (PCs) offer wave-focusing capabilities with high intensity, which can be tailored by only structural design [15]. In the last decade, gradient index phononic crystal (GRIN-PC) lenses have been proven to focus elastic wave energy at desired ...
J. Acoustic mirage in two-dimensional gradient-index phononic crystals. J. Appl. Phys. 106, 53529 (2009). Article Google Scholar Torrent, D. & Sánchezdehesa, J. Acoustic metamaterials for new two-dimensional sonic devices. New J. Phys. 9, 323 (2007). Article ADS Google Scholar Zig...
gradient-index phononic crystals2D phononic-crystal waveguidesolid scatterersepoxyWe report a novel approach to effectively couple acoustic energy into a two-dimensional phononic-crystal waveguide by an acoustic beamwidth compressor using the concept of a gradient-index phononic crystal (GRIN PC). The ...
CrystalsRefractive indexWave platesLens designUltrasonicsWaveguidesPhase velocityOne of the current challenges in the guided wave ultrasonic testing of large-scale structures is attenuation. In this study, elastic wave propagation characteristics of a composite plate that is sampled from aerospace industry ...
It is shown that by means of complex graded phononic crystals and thickness variations it is possible to independently design the three refractive indexes of these waves, allowing therefore their simultaneous control. The effective medium theory required for this purpose is presented, and the method ...
Modeling phononic crystals via the weighted relaxed micromorphic model with free and gradient micro-inertia. Journal of Elasticity, 130(1):59-83, 2018.Angela Madeo, Manuel Collet, Marco Miniaci, Kevin Billon, Morvan Ouisse, and Patrizio Neff. Modeling phononic crystals via the weighted relaxed ...
methods for fabricating desired FGMs (see e.g., [10]). Some spatial dependencies of the material parameters allow for exact analytical solutions to the corresponding model equations [11], [12], [13]. FGMs are especially used to control the transmission properties of phononic crystals [13], ...