Design and analysis of arbitrary shaped bifunctional cloaks for multifunctional material composites

Abstract

Abstract The conventional cloaks that execute two physical fields in a single structure are often limited in their applications due to their regular geometry. This work proposes a solution to this problem by introducing an irregular shape bifunctional cloak that shields the cloaked region from both electric and thermal fields. Unlike previous cloaks, the proposed cloak can be designed with arbitrary shapes, which greatly expands its potential applications. The cloak is designed using Transformation Optics (TO) theory to derive the constitutive parameters required to execute the cloaking phenomenon. The numerical simulation setup is then devised based on the calculated parameters, and the functionality of the cloak is thoroughly validated. The results show that the proposed cloak can efficiently cloak a conductive or non-conductive material under both plan wave and point source excitation conditions. Moreover, the ability to cloak conductive materials make it an ideal candidate for engineering and medical applications where regular geometries are restricted.