形状各向异性对纳米结构磁光活性光谱表征的影响
The effect of shape anisotropy on the spectroscopic characterization of the magneto-optical activity of nanostructures
摘要：
如何测量放置在电介质衬底上的椭圆等离子体纳米盘的磁场诱导的磁光（MO）活性仍然是一个挑战，因为衬底贡献了大部分的整体MO，其随着相对于纳米盘的取向的光偏振而变化。在这里，我们提出了一个光谱表征。我们发现，只有当光从纳米结构侧入射，偏振与两个对称轴之一对齐时，才能从基底中减去MO贡献，其量等于裸基底的量。通过详细的偏振透射率测量，我们确定了纳米盘的两个对称轴的取向。然后，光偏振沿着轴对齐，使得能够测量金纳米盘的固有MO活性，其是总MO活性减去裸玻璃基板的MO活性。分子轨道光谱中等离子体共振特征的窄线宽意味着在折射率传感中的潜在应用。
英文摘要：
How to measure magnetic field induced magneto-optical (MO) activity of nonmagnetic elliptical plasmonic nanodisks which rest on a dielectric substrate remains a challenge since the substrate contribute most of the overall MO which varies with light polarization with respect to the orientation of the nanodisks. Here we present a spectroscopic characterization. We find that only when light is incident from the nanostructures side with polarization aligned with one of the two symmetry axes, one can subtract the MO contribution from the substrate by an amount equal to that of a bare one. By a detailed polarizing transmittance measurement we determine the orientation of the two symmetry axes of the nanodisks. Light polarization is then aligned along the axes, enabling measurement of the intrinsic MO activity of gold nanodisks, which is the overall MO activity subtracted by that of a bare glass substrate. The narrow line widths of the plasmonic resonance features in the MO spectra imply a potential application in refractive index sensing.
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