“…Driven by the recent advances in designing and tailoring new (meta)materials [1], there has been increasing interest in studying new optical phenomena in recent years. In order to remind readers of some remarkable achievements of such investigations, we mention the interesting effects of electromagnetically induced transparency (EIT) [2,3], optical systems presenting a negative index of refraction [4,5], cloaking devices [1], one-way propagation and optical isolators [6][7][8], and light-trapping devices [9,10], among many others. Regarding EIT, an experimental demonstration of the effect was reported in 1991, where an optically thick medium was shown to become transparent by means of a destructive interference caused by the application of an external electromagnetic field [11].…”