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应用离散偶极子近似方法计算了金纳米管结构的消光光谱及其近场电场分布,并与金纳米柱的计算结果进行了比较.结果发现,当以等离子体共振峰波长入射时,管状纳米结构拥有更大面积的强电场分布.故管状纳米结构更适合作为表面增强拉曼散射的衬底,用于生物分子或者化学分子的探测.另外,我们还研究了纳米管结构参数对其等离子体共振峰的影响,以调节等离子体共振峰的位置,从而满足其在表面增强拉曼散射等等离子体光子学方面的应用.
The extinction spectra and the near-field electric field distribution of the gold nanotubes were calculated by the discrete dipole approximation method and compared with the results of the gold nanocolumns. The results showed that when the nanotubes were incident at the plasma resonance wavelength, Structure has a larger area of strong electric field distribution.Therefore, tubular nanostructures are more suitable as surface enhanced Raman scattering substrates for the detection of biological molecules or chemical molecules.In addition, we also study the nanotube structure parameters of its plasma Formant to adjust the position of the plasma formant, so as to meet its surface enhanced Raman scattering and other plasma photonics applications.