Low-loss ultra-high-Q dark mode plasmonic Fano metamaterials
Low-loss ultra-high-Q dark mode plasmonic Fano metamaterials
复制标题
低损耗超高 Q 暗模式等离子体 Fano 超材料
DOI：
10.1364/ol.37.003366
复制
发表时间：
2012-08-15
期刊：
影响因子：
3.6
通讯作者：
Zhang, Weili
中科院分区：
文献类型：
--
作者：
Cao, Wei;Singh, Ranjan;Zhang, Weili
我们通过实验证明了一种具有227超高质量因子(Q)的平面太赫兹法诺超材料。这是通过在超材料结构中引入微小的不对称性来激发非辐射暗模式来实现的。在电场的正交极化下，以正入射激发出极尖锐的四极共振和范诺共振。为了捕获暗共振模式的窄线宽，我们进行了高分辨率太赫兹时域测量，扫描长度为200皮秒，频率分辨率为5 GHz。这些高q超材料可用于超灵敏无标签太赫兹传感、密集光子集成和窄带滤波。(C) 2012美国光学学会
We experimentally demonstrate a planar terahertz Fano metamaterial with an ultrahigh quality (Q) factor of 227. This is achieved by the excitation of the nonradiative dark modes by introducing a tiny asymmetry in the metamaterial structure. The extremely sharp quadrupole and Fano resonances are excited at normal incidence for orthogonal polarizations of the electric field. In order to capture the narrow linewidth of the dark resonance modes, we perform high resolution terahertz time-domain measurements with a scan length of 200 picoseconds and frequency resolution of 5 GHz. These high-Q metamaterials can be used in ultrasensitive label-free terahertz sensing, dense photonic integration, and narrowband filtering. (C) 2012 Optical Society of America