منابع مشابه
Acoustic Cloaking
Introduction An acoustic cloak is a shell surrounding an object so that sound incident from any direction passes through and around the cloak, making the cloak and the object acoustically “invisible.” We do not experience acoustic cloaking because the materials required are exotic and, as far as we know, not found in nature. Yet there is no fundamental physical restriction on acoustic cloaking....
متن کاملAcoustic cloaking theory
An acoustic cloak is a compact region enclosing an object, such that sound incident from all directions passes through and around the cloak as though the object was not present. A theory of acoustic cloaking is developed using the transformation or change-of-variables method for mapping the cloaked region to a point with vanishing scattering strength. We show that the acoustical parameters in t...
متن کاملAcoustic and electromagnetic cloaking
In this talk, we shall present our recent progress on acoustic and electromagnetic cloaking of obstacles with transformation media. In wave scattering, an obstacle is an object that waves cannot penetrate inside. With artificially designed transformation media, we show that the obstacle can be virtually reshaped under acoustic or electromagnetic wave detection. These cloaking media are shown to...
متن کاملOne path to acoustic cloaking
A complete analysis of coordinate transformations in elastic media by Milton et al has shown that, in general, the equations of motion are not form invariant and thus do not admit transformation-type solutions of the type discovered by Pendry et al for electromagnetics. However, in a two-dimensional (2D) geometry, the acoustic equations in a fluid are identical in form to the single polarizatio...
متن کاملApproximate Quantum and Acoustic Cloaking
For any E ≥ 0, we construct a sequence of bounded potentials V E n , n ∈ N, supported in an annular regionBout\Binn ⊂ R, which act as approximate cloaks for solutions of Schrödinger’s equation at energy E: For any potential V0 ∈ L∞(Binn) such that E is not a Neumann eigenvalue of −∆+ V0 in Binn, the scattering amplitudes aV0+V E n (E, θ, ω) → 0 as n → ∞. The V E n thus not only form a family of...
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ژورنال
عنوان ژورنال: New Journal of Physics
سال: 2010
ISSN: 1367-2630
DOI: 10.1088/1367-2630/12/4/043049