Gao Hanwei, Henzie Joel, Odom Teri W
Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA.
Nano Lett. 2006 Sep;6(9):2104-8. doi: 10.1021/nl061670r.
This paper provides direct evidence for the role of surface plasmons in the enhanced optical transmission of light through metallic nanoscale hole arrays. Near-field optical images directly confirmed the presence of surface plasmons on gold nanohole arrays with interhole spacings larger than the surface plasmon wavelength. A simple interference model provides an intuitive explanation of the two types of fringe wavelengths observed in the near-field optical images. Far-field spectroscopy revealed a surface plasmon band that contributed a factor > 8 to the transmission enhancement. Furthermore, silicon nanohole arrays did not exhibit any features in the near-field, which demonstrates that metallic materials are necessary for enhanced light transmission through nanohole arrays.
本文为表面等离子体激元在增强光透过金属纳米级孔阵列的光学传输中所起的作用提供了直接证据。近场光学图像直接证实了在孔间距大于表面等离子体激元波长的金纳米孔阵列上存在表面等离子体激元。一个简单的干涉模型对在近场光学图像中观察到的两种条纹波长提供了直观的解释。远场光谱揭示了一个表面等离子体激元带，其对传输增强的贡献因子大于8。此外，硅纳米孔阵列在近场中未表现出任何特征，这表明金属材料对于增强光透过纳米孔阵列是必要的。
