Broadband diffuse reflections of sound by metasurface with random phase response
1 Key Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Department of Physics, Nanjing University Nanjing 210093, PRC
2 Collaborative Innovation Center of Advanced Microstructures, Nanjing University - Nanjing 210093, PRC
Received: 30 May 2015
Accepted: 11 September 2015
We have designed an ultrathin planar structure capable of generating diffuse reflections within a broadband. By introducing randomly distributed gradients along the interface, the proposed structure can scatter the incident acoustic waves into all directions and virtually suppress the scattered lobes that will otherwise be remarkable for a planar surface. A practical implementation by labryinthine-like metamaterial with designed phase shift profile is demontrated. The numerical results show that our designed planar surface could be used to mimic a rugged surface as expected. We envision our designed structure to exhibit potentials in applications such as room acoustics and acoustic stealth.
PACS: 43.20.El – Reflection, refraction, diffraction of acoustic waves / 43.20.+g – General linear acoustics / 43.40.+s – Structural acoustics and vibration
© EPLA, 2015