A conformal mapping is proposed to design with transformation method broadband elastic wave omnidirectional absorbers. This conformal mapping transforms the infinity of the virtual space into the origin of the physical space and keeps the transformed material isotropic. The material realization of such elastic wave absorber is proposed and validated by numerical simulation. Different from the existing procedure based on Hamiltonian optics, the proposed method is a more general one and can be applied to any physical process where the transformation method is valid. It also includes the existing techniques as the special cases for electromagnetic and acoustic waves.
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Chang et al. (2012) studied this question.
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