We show that microstructures built from nonmagnetic conducting sheets exhibit an effective magnetic permeability /spl mu//sub eff/, which can be tuned to values not accessible in naturally occurring materials, including large imaginary components of /spl mu//sub eff/. The microstructure is on a scale much less than the wavelength of radiation, is not resolved by incident microwaves, and uses a very low density of metal so that structures can be extremely lightweight. Most of the structures are resonant due to internal capacitance and inductance, and resonant enhancement combined with compression of electrical energy into a very small volume greatly enhances the energy density at critical locations in the structure, easily by factors of a million and possibly by much more. Weakly nonlinear materials placed at these critical locations will show greatly enhanced effects raising the possibility of manufacturing active structures whose properties can be switched at will between many states.
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机译：我们表明，由非磁性导电片材构建的微结构表现出有效的磁导率/ spl mu // sub eff /，可以将其调整为在自然存在的材料中无法获得的值，包括/ spl mu // sub eff /的大虚部。微观结构的规模远小于辐射波长，不能被入射微波分辨，并且使用非常低的金属密度，因此结构可以非常轻便。大多数结构由于内部电容和电感而谐振，并且谐振增强与电能压缩成非常小的体积相结合，极大地提高了结构关键位置的能量密度，轻松提高了百万分之一甚至更多。 。放置在这些关键位置的弱非线性材料将显示出极大的增强效果，从而增加了制造有源结构的可能性，该有源结构的特性可以在许多状态之间随意切换。
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