由Anapole激发产生的极高Q因子的超材料
Extremely High Q-factor metamaterials due to Anapole Excitation
摘要：
我们证明了理想的Anapole超材料具有无穷大的Q因子。我们已经设计并制造了一种由平面超分子组成的超材料，该超材料在电偶极辐射几乎被环形偶极辐射抵消的意义上表现出anapole行为，从而在谐振频率处产生极高的Q因子。在mm范围内的系统尺寸和寄生磁四极辐射是限制Q因子大小的因素。尽管辐射损失非常低，但超分子处的局部场极高，其量级高于外部入射场。
英文摘要：
We demonstrate that ideal anapole metamaterials have infinite Q-factor. We have designed and fabricated a metamaterial consisting of planar metamolecules which exhibit anapole behavior in the sense that the electric dipole radiation is almost cancelled by the toroidal dipole one, producing thus an extremely high Q-factor at the resonance frequency. The size of the system, at the mm range, and the parasitic magnetic quadrupole radiation are the factors limiting the size of the Q-factor. In spite of the very low radiation losses the local fields at the metamolecules are extremely high, of the order of higher than the external incoming field.
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