Figure 24.
Polymer based acoustic “super absorbers” and reflectors. (a) Locally resonant 3D PnC comprised of rubber-coated lead spheres on a simple cubic lattice in an epoxy matrix and (b) its measured transmission spectra with (solid circles) and without (open square) resonators. Reproduced with permission.357 Copyright 2000, American Association for the Advancement of Science. (c) Bubble meta-screen made of air voids (R = 39 μm) in a PDMS matrix and (d) transmission spectra of a one-layer (circles) and four-layer crystals (squares) with lines of theoretical predictions. Reproduced with permission.392 Copyright 2009, American Institute of Physics.