From Tunneling of Light to Tunneling of Sound – What's New in the Gradient Metamaterials?

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While dreaming about these "interesting contributions" the researchers are looking often for the "white spots" in such attractive branches of modern science as astrophysics or nonlinear physics. However, these desired "spots" are concealed sometimes in the familiar branches of classical physics, where, at first appear, nothing unexpected could be found. An instructive example of such speck, which soon had grown up to the several cross-disciplinary fields of pure and applied physics, was given by the unique discovery — discovery of tunneling of waves phenomena; these enigmatic effects are provoking the rise and fall of ideas during almost a century till now.