We observed resonant states on the interface between the acoustic metamaterials of negative effective mass density and negative effective modulus, which were based on membranes and side holes, respectively. All resonances excited by placing the driving pressure at different places have the same spatial pressure distribution and resonance frequency. The amplitude decayed exponentially on both sides of the interface. We present experimental results on the spatial and the spectral characteristics of the resonant states.
Bibliographical noteFunding Information:
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (NRF F01-2009-000-10028-0 and 2010-0012562).
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)