劈裂纳米矩形的Fano共振效应及对不同偏振角入射激光的衰减作用

发布时间：2018-02-25 22:03

本文关键词： 劈裂金属纳米矩形传感器 Fano共振消光光谱激光强度　出处：《光电子·激光》2017年05期 　论文类型：期刊论文

【摘要】：利用时域有限差分(FDTD)法模拟了所设计的一种新型劈裂纳米矩形结构消光光谱、近场增强和电荷分布情况。研究了在劈裂金属纳米矩形中,Fano共振形成机理、结构参数对Fano共振峰的影响,以及当入射场偏振方向不同时在红外波长处形成的消光率同等强度骤增现象。研究表明,当改变周围环境折射率时,Fano共振峰有一个非常明显的移动,品质因数FoM可以达到11.8,这种新型劈裂纳米矩形有很好的传感特性。入射光沿不同偏振方向穿过劈裂金属纳米矩形时,在特定红外波长处形成同等强度的消光率增强,对不同偏振角激光强度形成统一衰减的特性使其在混合偏振角激光的强度衰减等光学方面有着重要的应用价值。
[Abstract]:The extinction spectra, near field enhancement and charge distribution of a novel split nanoscale structure are simulated by FDTD method. The formation mechanism of Fano resonance in split metal nanoscale is studied. The influence of structural parameters on the resonance peak of Fano and the phenomenon of the same intensity of extinction formed at infrared wavelength when the polarization direction of incident field is different at the same time. There is a very obvious shift of the Fano resonance peak when the refractive index of the surrounding environment is changed. The quality factor (FoM) can reach 11.8. This new split nanoscale has good sensing properties. When the incident light passes through the split metal nanoscale along different polarization directions, The extinction rate of the same intensity is enhanced at the specific infrared wavelength, and the uniform attenuation of the intensity of the laser at different polarization angles makes it valuable in optical applications such as the intensity attenuation of the hybrid polarization angle laser.
【作者单位】：天津大学精密仪器与光电子工程学院生物医学工程系;
【基金】：天津市自然科学基金(14JCYBJC30500)资助项目
【分类号】：O436

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