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Novel Optical Transformation Devices Based on All Dielectric Materials
Keywords: Metamaterials, Optical Transformation, carpet cloak
Optical transformation (OT), which has received intensive interest since 2006, provides the framework to manipulate electromagnetic fields by modifying the material properties of a structure. The application of transformation optics to another burgeoning field, metamaterials, has led to many novel applications, most notable among them being the pioneering work on the development of invisibility cloaks and many other fascinating applications. OT can control the propagation of electromagnetic waves (including light) by filling the space with artificial media which have coordinate-dependent constitutive parameters. However, many of the current transformation optics designs focus upon perfect rerouting of the electromagnetic energy, and therefore do not pay enough attention to the resultant material requirements. This means that the required material properties often involve spatially dependant ε and μ which can be anisotropic, with off-diagonal elements and may require sub-unity values. These would be practically impossible to fabricate. Here, as this paper shows, if consideration is given to the transformation chosen, and some approximations are made, then the material requirements can be achieved with very low-tech and currently available dielectrics. Three different kinds of low loss and broadband all-dielectric realizations of OT devices are designed, simulated and experimentally demonstrated here at microwave frequency: extraordinary-transmission (ET) device, two dimensional carpet cloak and three dimensional carpet cloak. All devices are proved to be low loss and broadband.
Di Bao, Lecturer
Southeast University, Nanjing, China
Nanjing, Jiangsu
China


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