Full controlling of Fano resonances in metal-slit superlattice.
Full controlling of Fano resonances in metal-slit superlattice.
复制标题
完全控制金属狭缝超晶格中的法诺共振。
DOI：
10.1038/srep18461
复制
发表时间：
2015-12-18
影响因子：
4.6
通讯作者：
Wang GP
中科院分区：
文献类型：
--
作者：
Deng ZL;Yogesh N;Chen XD;Chen WJ;Dong JW;Ouyang Z;Wang GP
Fano共振线形的控制因其在激光、生物传感、慢光等方面的广泛应用而备受关注。然而，可控的Fano共振总是要求复杂的对称破坏结构严格对准，因此操作只能在有限的自由度和狭窄的调谐范围内进行。此外，到目前为止，还没有关于在单个结构中独立控制亮模式和暗模式的报道。在这里，我们半解析地表明，在简单对称的金属狭缝超晶格中，亮模和暗模的光谱位置和线宽都可以独立和/或同时调谐，从而允许自由和连续地控制单Fano共振和多Fano共振的线形。实际金属的数值模拟和微波实验表明，该独立控制方案适用于从光学频率到微波频率的极大电磁频谱范围。我们的发现可能会为未来的可调谐电磁设备提供方便和灵活的策略。
Controlling of the lineshape of Fano resonance attracts much attention recently due to its wide capabilities for lasing, biosensing, slow-light applications and so on. However, the controllable Fano resonance always requires stringent alignment of complex symmetry-breaking structures and thus the manipulation could only be performed with limited degrees of freedom and narrow tuning range. Furthermore, there is no report so far on independent controlling of both the bright and dark modes in a single structure. Here, we semi-analytically show that the spectral position and linewidth of both the bright and dark modes can be tuned independently and/or simultaneously in a simple and symmetric metal-slit superlattice and thus allowing for a free and continuous controlling of the lineshape of both the single and multiple Fano resonances. The independent controlling scheme is applicable for an extremely large electromagnetic spectrum range from optical to microwave frequencies, which is demonstrated by the numerical simulations with real metal and a microwave experiment. Our findings may provide convenient and flexible strategies for future tunable electromagnetic devices.