We realized zero-mass metamaterials by making the inertance of membrane-covered air holes close to zero. We thereby experimentally and theoretically demonstrate a new mechanism for acoustic extraordinary transmission. For a filling fraction of 1 % we obtained a 57% transmission intensity (76% in amplitude); this implies that on resonance the particle velocity inside a hole is 76 times greater than that of incident wave, corresponding to an intensification of the acoustic energy density by a factor of 5700. Such a high concentration of acoustic energy into a small hole of radius r = λ/56 enables sensitive detection of acoustic signals with subwave-length resolution. Potential applications include scanning near-field acoustic microscopy.
|Number of pages||8|
|State||Published - 2013|
|Event||20th International Congress on Sound and Vibration 2013, ICSV 2013 - Bangkok, Thailand|
Duration: 7 Jul 2013 → 11 Jul 2013
|Conference||20th International Congress on Sound and Vibration 2013, ICSV 2013|
|Period||7/07/13 → 11/07/13|