Modeling and experimental verification of an ultra-wide bandgap in 3D phononic crystal

This paper reports a comprehensivemodeling and experimental characterization of a three-dimensional phononic crystal composed of a single material, endowed with an ultra-wide completebandgap. The phononicband structure shows a gap-mid gap ratio of 132% that is by far the greatest full 3Dbandgap in literature for any kind of phononic crystals. A prototype of the finitecrystal structure has been manufactured in polyamide by means of additive manufacturing technology and tested to assess the transmission spectrum of the crystal. The transmission spectrum has been numerically calculated taking into account a frequency-dependentelastic modulus and a Rayleighmodel for damping. The measured and numerical transmission spectra are in good agreement and present up to 75  dB of attenuation for a three-layer crystal.

Source: Applied Physics Letters - December 2, 2016 Category: Physics Authors: L. D'Alessandro, E. Belloni, R. Ardito, A. Corigliano and F. Braghin Source Type: research