Shape-enhanced magneto-optical activity: Degree of freedom for active plasmonics
Shape-enhanced magneto-optical activity: Degree of freedom for active plasmonics
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DOI：
10.1103/physrevb.82.161403
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发表时间：
2010-10-05
影响因子：
3.7
通讯作者：
Takahashi, M.
中科院分区：
文献类型：
--
作者：
Du, G. X.;Mori, T.;Takahashi, M.
具有增强磁光活性的磁等离子体纳米结构在等离子体传播的主动操纵方面具有很大的前景。在这个快速通信中，我们证明了椭圆形纳米柱的形状对大增强的MO活性起着至关重要的作用：（1）饱和MO活性分量取决于入射光的偏振面相对于椭圆纳米柱的半长轴的角度，以及（2）低磁场诱导具有非铁磁起源的MO活动，其表现出添加到MO环中的饱和分量的巨大线性分量。有趣的光学和MO属性在一个模型中得到很好的解释，通过分配一个双轴有效介电常数张量的椭圆纳米柱阵列。研究表明，通过精细调节等离子体共振以及增加椭圆纳米柱的纵横比，可以最大限度地提高形状增强的MO活性。
Magnetoplasmonic nanostructures with enhanced magneto-optical (MO) activity hold great promise for the active manipulation of plasmon propagation. In this Rapid Communication, we demonstrate that the shape of elliptical nanocylinder plays an essential role on the large enhanced MO activity: (1) saturated MO activity component depends on the angle of polarization plane of incident light with respect to the semimajor axis of elliptical nanocylinder and (2) a low magnetic field induces MO activity with nonferromagnetic origin exhibiting a giant linear component added to the saturated component in the MO loops. The intriguing optical and MO properties were well interpreted within one model by assigning a biaxial effective permittivity tensor to the elliptical nanocylinder array. It is suggested that the shape enhanced MO activity can be maximized by elaborately tuning the plasmon resonance as well as increasing the aspect ratio of elliptical nanocylinder.