Splitting of acoustic energy by zero index metamaterials

Abstract An acoustic power splitter is proposed by utilizing a zero index metamaterials (ZIM) junction. Two types of ZIM, single zero index metamaterials (SZIM) and double zero index metamaterials (DZIM), are considered. The acoustic wave transmission through the multiple leads junction is investigated theoretically and numerically. We show that perfect transmission can be achieved for the junction made of DZIM by tuning the widths of the output leads with respect to the input lead. It is also shown that the same effect is obtained for the junction made of SZIM by reducing the area of the junction or introducing a proper defect into the junction. A two-dimensional (2D) acoustic crystal (AC) with effective zero index is suggested to provide a practical realization for the splitting system.