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5 March 2010 Magnetic-field enhancement beyond the skin-depth limit
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Electric field enhancement has been actively studied recently and many metallic structures that are capable of locally enhancing electric field have been reported. The Babinet's principle can be utilized, especially in the form of Booker's extension, to transform the known electric field enhancing structures into magnetic field enhancing structures. The authors explain this transformation process and discuss the regime in which this principle breaks down. Unless the metals used can be well approximated with a PEC model, the principle's predictions fails to hold true. Authors confirm this aspect using numerical simulations based on realistic material parameters for actual metals. There is large discrepancy especially when the structural dimensions are comparable or less than the skin-depth at the wavelength of interest. An alternative way to achieve magnetic field enhancement is presented and the design of a connected bow-tie structure is proposed as an example. FDTD simulation results confirm the operation of the proposed structure.
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Jonghwa Shin, Namkyoo Park, Shanhui Fan, and Yong-Hee Lee "Magnetic-field enhancement beyond the skin-depth limit", Proc. SPIE 7601, Terahertz Technology and Applications III, 76010B (5 March 2010);

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