Theory and experiment of isotropic electromagnetic beam bender made of dielectric materials

Details Theory and experiment of isotropic electromagnetic beam bender made of dielectric materials Theory and experiment of isotropic electromagnetic beam bender made of dielectric materials

2009-12-14

arxiv.org/abs/0912.2604v2

Advanced Materials Research Vols. 150-151 (2011) pp 1508-1516

Physics

Optics

9 pages, 9 figures

Scientific paper

10.4028/www.scientific.net/AMR.1

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

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