Acoustic metamaterial exhibiting four different sign combinations of density and modulus

作者：Seo Yong Mun^*; Park Jong Jin; Lee Seung Hwan; Park Choon Mahn; Kim Chul Koo; Lee Sam Hyeon

来源：Journal of Applied Physics, 2012, 111(2): 023504.

DOI：10.1063/1.3676262

We fabricated a double negative acoustic metamaterial which consisted of Helmholtz resonators and membranes. Experimental data on the transmission and dispersion relation are presented. The system exhibited three frequencies where the acoustic state makes sharp transitions from density negative (rho-NG) to double negative (DNG), modulus negative (B-NG), and double positive (DPS) in sequence with the frequency. We observed a wide range of negative refractive indexes from -0.06 to -3.7 relative to air, which will allow for new acoustic transformation techniques.

• 出版日期2012-1-15