Fano resonances in a plasmonic waveguide system composed of stub coupled with a square cavity resonator
Fano resonances in a plasmonic waveguide system composed of stub coupled with a square cavity resonator
复制标题
由短截线与方腔谐振器耦合组成的等离激元波导系统中的法诺共振
DOI：
10.1088/2040-8978/18/5/055002
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发表时间：
2016-05-01
影响因子：
2.1
通讯作者：
Cui Yiping
中科院分区：
文献类型：
--
作者：
Yun Binfeng;Hu, Guohua;Cui Yiping
提出并分析了一种可产生尖锐且不对称Fano共振的耦合等离子体波导谐振器系统。两个 Fano 共振是由等离子体方腔谐振器中的窄离散回音壁模式与金属-绝缘体-金属短截线谐振器的广谱之间的相互作用引起的。一阶和二阶 Fano 谐振之间的相对峰值幅度可以通过改变结构参数来调整，例如方形腔尺寸、短截线尺寸以及方形腔与短截线谐振器之间的中心到中心距离。而一阶 Fano 共振峰是一种驻波模式，当它与二阶 Fano 共振耦合时，会分裂成两个共振峰（一个驻波模式和一个行波模式）。此外，还研究了所提出的 Fano 系统作为集成慢光设备和折射率传感器的潜力。结果表明，可以实现约100的最大群折射率，并且可以获得938 nm/RIU的线性折射率灵敏度和约1.35×104的品质因数。
A coupled plasmonic waveguide resonator system which can produce sharp and asymmetric Fano resonances was proposed and analyzed. Two Fano resonances are induced by the interactions between the narrow discrete whispering gallery modes in a plasmonic square cavity resonator and the broad spectrum of the metal–insulator–metal stub resonator. The relative peak amplitudes between the 1st and 2nd order Fano resonances can be adjusted by changing the structure parameters, such as the square cavity size, the stub size and the center-to-center distance between the square cavity and the stub resonators. And the 1st order Fano resonant peak, which is a standing-wave mode, will split into two resonant peaks (one standing-wave mode and one traveling-wave mode) when it couples with the 2nd Fano resonance. Also, the potential of the proposed Fano system as an integrated slow-light device and refractive index sensor was investigated. The results show that a maximum group index of about 100 can be realized, and a linear refractive index sensitivity of 938 nm/RIU with a figure of merit of about 1.35 × 104 can be obtained.