A cluster of many small holes with negative imaginary surface impedances may generate a negative refraction index

Ahmed Alsaedi, Bashir Ahmed, Durga Prasad Challa +2

We deal with the scattering of an acoustic medium modeled by an index of refraction $n$ varying in a bounded region $\Omega$ of ${\mathbb{R}}^3$ and equal to unity outside $\Omega$. This regio…