Key points are not available for this paper at this time.
The authors describe a c0{0ex}o0{0ex}i0{0ex}l0{0ex}i0{0ex}n0{0ex}g-u0{0ex}p-s0{0ex}p0{0ex}a0{0ex}c0{0ex}e approach to harvesting energy from ubiquitous, ambient low-frequency sound. They design multilateral metasurfaces composed of a labyrinthine series, for acoustic focusing and energy confinement. Control of the first reflection, coupling effects, and multiple reflections between and among the metasurfaces are discussed.
Qi et al. (Fri,) studied this question.