Transformational acoustic metamaterials based on pressure gradients

Autor:	García-Meca, C., Carloni, S., Barceló, C., Jannes, G., Sánchez-Dehesa, J., Martínez, A.
Rok vydání:	2014
Předmět:	General Relativity and Quantum Cosmology Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Materials Science Physics - Classical Physics
Zdroj:	Phys. Rev. B 90, 024310 (2014)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.90.024310
Popis:	We apply a homogenization process to the acoustic velocity potential wave equation. The study of various examples shows that the resulting effective properties are different from those of the homogenized pressure wave equation for the same underlying acoustic parameters. A careful analysis reveals that a given set of inhomogeneous parameters represents an entirely different physical system depending on the considered equation. Our findings unveil a different way of tailoring acoustic properties through gradients of the static pressure. In contrast to standard metafluids based on isobaric composites, this alternative kind of metafluids is suitable for the implementation of transformational devices designed via the velocity potential equation. This includes acoustic systems in a moving background or arising from general space-time transformations. As an example, we design a device able to cloak the acoustic velocity potential. Comment: 11 pages, 4 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1409.5773 Zobrazit plný text záznamu View this record from Arxiv