It looks like the whole metamaterial/negative-index material movement just got another shot in the arm with development of an “acoustic metamaterial lens” that can theoretically create an acoustic/sonic “invisibility cloak” a.k.a. “cloak of silence” capable of hiding military submarines from enemy detection. DefenseReview first reported on metamaterials a.k.a. negative-index materials or “negative index metamaterials” in August 2006. The technology on which we were reporting at the time theoretically has the potential to lead to an optical invisibility cloak for cloaking soldiers and military equipment and vehicles.
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