TY - UNPB AB - We design extremely-thin acoustic metasurfaces, providing a versatileplatform for the manipulation of reflected pressure fields, that areconstructed from mass loads and stretched membranes fixed to a periodic rigidframework. These metasurfaces demonstrate deeply subwavelength control and canhave thicknesses an order of magnitude less than those based around Helmholtzresonators. Each sub-unit of the metasurface is resonant at a frequency tunedgeometrically, this tunability provides phase control and using a set of finelytuned membrane resonators we create a phase-grating metasurface. This surfaceis designed to exhibit all-angle negative reflections with the ratio ofwavelength, $\lambda$, to thickness, $h$, of $\lambda/h\approx 23.1$, and tocreate a flat mirror using the phase profile of an elliptic reflecting mirror.A further important acoustic application is to sound diffusers and we proceedto design a deeply subwavelength membrane-based meta-diffuser that can be twoorders of magnitude thinner than the operating wavelength, i.e. thickness$\approx\lambda/102$. This paves the way for developing advanced acousticmetasurfaces with applicability to functional acoustic devices in sound-relatedindustries. AU - Wang,Y-T AU - Craster,R PB - arXiv PY - 2020/// TI - Designing hyper-thin acoustic metasurfaces with membrane resonators UR - http://arxiv.org/abs/2007.09759v1 UR - http://hdl.handle.net/10044/1/87571 ER -