Design of a broadband metamaterial-based acoustic lens using elaborated carpet cloak strategy

Generating plane waves for sonar systems is of high value due to their directive nature. In this paper, first, the unidirectional carpet cloak theory will be elaborated for converting arbitrary wavefronts to plane waves and collimating transmitted energy. Next, as an specific case study, converting cylindrical waves to plane waves will be demonstrated. Broadband capability of pentamode metasurfaces along with impedance matching has made these...