Laser Zentrum Hannover e.V., Hollerithallee 8, D-30419 Hannover, Germany.
Nano Lett. 2012 Jul 11;12(7):3749-55. doi: 10.1021/nl301594s. Epub 2012 Jun 20.
Strong resonant light scattering by individual spherical Si nanoparticles is experimentally demonstrated, revealing pronounced resonances associated with the excitation of magnetic and electric modes in these nanoparticles. It is shown that the low-frequency resonance corresponds to the magnetic dipole excitation. Due to high permittivity, the magnetic dipole resonance is observed in the visible spectral range for Si nanoparticles with diameters of ∼200 nm, thereby opening a way to the realization of isotropic optical metamaterials with strong magnetic responses in the visible region.
实验证明了单个球形 Si 纳米粒子的强共振光散射，揭示了与这些纳米粒子中磁模和电模激发相关的显著共振。结果表明，低频共振对应于磁偶极子激发。由于介电常数较高，直径约为 200nm 的 Si 纳米粒子在可见光谱范围内观察到磁偶极子共振，从而为在可见区域实现具有强磁响应的各向同性光学超材料开辟了道路。
