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We show a design method of cloaking devices which work for target objectswith arbitrary shape and material by a topology optimisation with an accurateand efficient sensitivity analysis. Most of past researches on topologyoptimisation of cloaking devices intend to hide a circle-shaped perfectelectric conductor. In this case, the cloaking effect is highly dependent onthe shape and material of a target object. In this study, we consider to designa cloaking device which work regardless of the property of target objects bymodifying the definition of the objective function. Also, we developed anefficient and accurate sensitivity analysis with the boundary element methodand the ${\mathcal H}$-matrix method. We show that the proposed method cansuccessfully obtain desired cloaking devices with low computational cost.

A fast topology optimisation for material- and geometry-independent cloaking devices with the BEM and the ${\mathcal H}$-matrix method