Figure 4
From: Molding acoustic, electromagnetic and water waves with a single cloak
Acoustic and electromagnetic wave experiments versus finite element simulation.
(a,b) Experimental results in forward scattering for pressure waves (a) and transverse electric microwaves (b) for the same cloak containing a large glass bottle obstacle (a) and a small square metallic obstacle (b); The source is located 24 cm from the center of the cloak and its frequency lies inside the cloaking zone (5 KHz for pressure waves in (a) and 4.350 GHz for microwaves in (b); The real part of the pressure field in (a) and of the longitudinal magnetic field in (b) is measured within the inset of panel (c)-- see area marked with dashed lines--, which shows experimental results in backward and forward scattering for microwaves; (d) Comparison with finite element simulation, where Neumann (rigid for pressure field and infinite conducting for longitudinal magnetic field) boundary conditions are set on each inclusion. Cloaking is achieved as it transpires from the nearly unperturbed phase in both scenarios.
