Shadrivov, Ilya2015-12-109783642020640http://hdl.handle.net/1885/56981Nature has provided us with a wide range of materials exhibiting various electromagnetic properties. However, theoretical speculations [1] have suggested that having materials with some particular unnatural characteristics would enable us to observe veryNonlinear Metamaterials201010.1007/978-3-642-02066-7_142015-12-09