Based on a two-step linear optical transformation method, a homogeneous-materials-constructed electromagnetic field concentrator whose energy concentrating ratio varies with the incident angle of the electromagnetic wave is proposed. The design is achieved by compressing the space in different directions with different ratios. Numerical simulations are performed to demonstrate the properties, especially the wave-incident angle-dependent concentrating effect of the concentrator. The relationship between the wave-incident angle and the concentrating ratio is investigated and the corresponding analytical expression is given and verified. This wave-incident angle-dependent concentrator constructed with homogeneous materials shows an advantage of facilitating the implementation in practice and provides a convenient route to continuously adjust the concentrated energy density in a pre-defined strategy.
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Li et al. (2011) studied this question.
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