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Experimental study on invisibility cloaks

In the past few years, invisibility cloaking has experienced a tremendous development in both design methodologies and experimental implementations. However, serious bottlenecks still exist, such as the superluminal propagation in the cloak, the extreme parameters for an omnidirectional cloak and so on. To overcome the bottlenecks, plenty of works have been done. In this paper, some progresses of our group on the invisibility cloaks are reviewed, such as cylindrical cloak based on a new inverse design by combining the scattering cancellation method and transformation optics, large scale far-infrared invisibility cloak using inversed quasi-conformal mapping approach, broadband surface-wave transformation cloak and broadband polygonal invisibility cloak for visible light. We anticipate that the invisibility cloaking technology will be more useful in the future.