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应用离散偶极子近似的方法计算了L型金纳米棒双体结构的表面等离子体共振引起的消光光谱及其近场电场分布。研究表明在入射光的偏振方向为45°时双体结构的消光谱峰位发生蓝移;当入射光的偏振方向为135°时,双体结构的消光谱峰位发生红移。两根纳米棒间距较小时,由于相邻金纳米棒之间的电场强耦合作用,表面等离子体杂化出现新的共振能级,两根金纳米棒的连接处出现强的电场分布,这些结果对于金纳米棒结构在表面增强拉曼散射方面有一定的参考意义。
The extinction spectrum and the near-field electric field distribution caused by surface plasmon resonance of the L-shaped gold nanorods are calculated by the discrete dipole approximation method. The results show that when the polarization direction of incident light is 45 °, the peak of extinction spectrum of blue light is blue-shifted. When the polarization direction of incident light is 135 °, the extinction peak of red light of double structure is red-shifted. When the distance between the two nanorods is small, a new resonance level appears due to the strong electric field coupling between the adjacent Au nanorods, and the strong electric field distribution appears at the junction of the two Au nanorods. As a result, For the gold nanorod structure in the surface enhanced Raman scattering has some reference value.