In this paper, we present analytic formulas of the temporal convolution kernel functions involved in time-domain non-reflecting boundary condition (NRBC) for electromagnetic scattering problems. Such exact themselves lead to accurate and efficient algorithms computing NRBC domain reduction Maxwell’s system $${\mathbb {R}}^3$$ . A second purpose paper is derive a new model invisibility cloak. Di...

Invisibility cloaks for flexural waves have mostly been examined in a continuous-wave regime, while invisibility is likely to deteriorate short pulses. Here, we propose the practical realization of unidirectional cloak based on an area-preserving coordinate transformation. Time-resolved experiments reveal how deviates pulsed plane wave from its initial trajectory and wavefront perfectly recombi...

The ability to render objects invisible using a cloak (such that they are not detectable by an external observer) has long been a tantalizing goal1–6. Here, we demonstrate a cloak operating in the near infrared at a wavelength of 1,550 nm. The cloak conceals a deformation on a flat reflecting surface, under which an object can be hidden. The device has an area of 225 mm and hides a region of 1....

It was recently shown theoretically that the time-dependent heat conduction equation is form invariant under curvilinear coordinate transformations. Thus, in analogy to transformation optics, fictitious transformed space can be mapped onto (meta)materials with spatially inhomogeneous and anisotropic heat-conductivity tensors in the laboratory space. On this basis, we design, fabricate, and char...

We describe potentials which act as approximate cloaks for matter waves. These potentials are derived from ideal cloaks for the conductivity and Helmholtz equations. At most energies E, if a potential is surrounded by an approximate cloak, then it becomes almost undetectable and unaltered by matter waves originating externally to the cloak. For certain E, however, the approximate cloaks are res...