Department of Physics, National University of Singapore, 2 Science Drive 3, 117542 Singapore.
Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, 117576 Singapore.
Sci Rep. 2017 Feb 2;7:41869. doi: 10.1038/srep41869.
Magnetic Fano resonances in there-dimensional symmetry broken meta-foils at THz frequencies are theoretically and experimentally studied. Sharp Fano resonances occur due to the interference between different resonances and can be designed by choosing geometric parameters of the meta-foil. At the Fano resonances, the meta-foil supports antisymmetric modes, whereas, at the main resonance, only a symmetric mode exists. The meta-foil is left-handed at the Fano resonances and shows sharp peaks of the real part of the refractive index in transmission with small effective losses opening a way to very sensitive high-speed sensing of dielectric changes in the surrounding media and of mechanical configuration.
太赫兹频率下三维对称破缺亚波长金属片中的磁 Fano 共振被进行了理论和实验研究。由于不同共振之间的干涉，尖锐的 Fano 共振会发生，并且可以通过选择亚波长金属片的几何参数来设计。在 Fano 共振处，亚波长金属片支持非对称模式，而在主共振处，仅存在对称模式。在 Fano 共振处，亚波长金属片是左手性的，并且在传输中表现出折射率实部的尖锐峰值，有效损耗小，为周围介质介电常数变化和机械结构的非常灵敏的高速传感开辟了道路。
