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Abstract: In this paper, we utilize the deformation transformation optics DTO methodto design electromagnetic beam bender, which can change the direction ofelectromagnetic wave propagation as desire. According to DTO, the transformedmaterial parameters can be expressed by deformation tensor of the spatialtransformation. For a beam bender, since the three principal stretches at eachpoint induced by the spatial transformation are independent to each other,there are many possibilities to simplify the transformed material parameters ofthe bender by adjusting the stretches independently. With the DTO method, weshow that the reported reduced parameters of the bender obtained by equivalentdispersion relation can be derived as a special case. An isotropic bender isalso proposed according to this method, and it is fabricated by stackingdielectric materials in layered form. Experiments validate the function of thedesigned isotropic bender for a TE wave; it is also shown that the isotropicbender has a broadband with low loss, compared with the metamaterial bender.The isotropic bender has much easier design and fabrication procedures than themetamaterial bender.



Autor: Qibo Deng, Jin Hu, Zheng Chang, Xiaoming Zhou, Gengkai Hu

Fuente: https://arxiv.org/







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