Funneled focusing of planar acoustic waves utilizing the metamaterial properties of an acoustic lens

E. Walker; D. Reyes; M. M. Rojas; A. Krokhin; A. Neogi

doi:10.1117/12.2041051

19 February 2014 Funneled focusing of planar acoustic waves utilizing the metamaterial properties of an acoustic lens

E. Walker, D. Reyes, M. M. Rojas, A. Krokhin, A. Neogi

Proceedings Volume 8994, Photonic and Phononic Properties of Engineered Nanostructures IV; 89940H (2014) https://doi.org/10.1117/12.2041051
Event: SPIE OPTO, 2014, San Francisco, California, United States

Abstract

Metamaterial acoustic lenses are acoustic devices based on phononic crystal structures that take advantage of negative or near-zero indices of refraction. These unique properties arise due to either the antiparallel direction of the phase and group velocity or strongly anisotropic dispersion characteristics, usually above the first transmission band. In this study, we utilize an FDTD program to examine two phononic lenses that utilize anisotropic effects available in their second band to collimate and focus acoustic waves from a plane-wave source with a k₀₀ wavevector. The phononic crystals consist of stainless steel rods arranged in a square lattice with water as the ambient material. Results show collimation and focusing in the second band for select frequencies, f_c ± 0.005𝑓_𝑐.

Citation Download Citation

E. Walker, D. Reyes, M. M. Rojas, A. Krokhin, and A. Neogi "Funneled focusing of planar acoustic waves utilizing the metamaterial properties of an acoustic lens", Proc. SPIE 8994, Photonic and Phononic Properties of Engineered Nanostructures IV, 89940H (19 February 2014); https://doi.org/10.1117/12.2041051

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