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The coherent manipulation of acoustic waves on the nanoscale usually requiresmultilayers with thicknesses and interface roughness defined down to the atomicmonolayer. This results in expensive devices with predetermined functionality.Nanoscale mesoporous materials present high surface-to-volume ratio andtailorable mesopores, which allow the incorporation of chemicalfunctionalization to nanoacoustics. However, the presence of pores with sizescomparable to the acoustic wavelength is intuitively perceived as a majorroadblock in nanoacoustics. Here we present multilayered nanoacousticresonators based on mesoporous SiO$_2$ thin-films showing acoustic resonancesin the 5-100 GHz range. We characterize the acoustic response of the systemusing coherent phonon generation experiments. Despite resonance wavelengthscomparable to the pore size, we observe for the first time unexpectedlywell-defined acoustic resonances with Q-factors around 10. Our results open thepath to a promising platform for nanoacoustic sensing and reconfigurableacoustic nanodevices based on soft, inexpensive fabrication methods.

Mesoporous Thin-Films for Acoustic Devices in the Gigahertz Range