One-step polymeric phononic crystal manufacture

One-step fabrication of porous polymeric microcage via electrified jetting.

We report a one-step method to prepare porous polymeric microcages from blend emulsion solutions via electrified jetting.

Designing Phononic Crystal with Convex Optimization

Designing phononic crystals by creating frequency bandgaps is of particular interest in elastic and acoustic metamaterial engineering. Mathematically, the problem of optimizing the frequency bandgaps is often nonconvex, as it requires the maximization of the higher indexed eigenfrequency and the minimization of the lower indexed eigenfrequency. A novel algorithm [1] has been previously develope...

Transformation of sound by a phononic crystal

Several noise barriers made of phononic crystals (i.e. manmade composite materials with a periodic structure) have been designed over the last decade. The periodic structure of phononic crystal avoids sound propagation in a defined frequency range called Bragg band gap (i.e. waves are evanescent). This study aims at quantifying the perceptual impact of a noise barrier based on a phononic crysta...

One step forward

Complete phononic bandgaps and bandgap maps in two-dimensional silicon phononic crystal plates

It is shown that it is possible to obtain complete planar phononic bandgaps in square and hexagonal (honeycomb) lattice phononic crystals formed by etching a periodic array of circular holes in a thin silicon plate (or membrane). Also, better bandgap properties are obtained using the hexagonal lattice structure; and, with practical structure sizes, it is possible-to-obtain a gap-to-midgap ratio...