supported by the National Natural Science Foundation of China(Grant Nos.61571222,11104142,and 11474160);the Natural Science Foundation of Jiangsu Province,China(Grant No.BK20161009);the Qing Lan Project of Jiangsu Province,China;the Six Talent Peaks Project of Jiangsu Province,China
We investigate a one-dimensional acoustic metamaterial with a refractive index of near zero(RINZ) using an array of very thin elastic membranes located along a narrow waveguide pipe. The characteristics of the effec...