Plasmonic nanostructures made from Earth abundant and low-cost metals have recently emerged as a potential alternative to typical noble plasmonic metals. Here we report a quantum mechanical study of the optical response evolution of bi-metallic core-shell nanorods made of simple-metals Mg, Al and Na atoms. We base our calculations on the computationally efficient time-dependent density-functional theory. We find that core-shell nanorods show rich and enhanced optical properties in comparison to pristine nanorods as a result of the interface formed between the core and the shell regions. Perhaps the most interesting result from our calculation is the dramatic spectral intensity enhancements in the case of core-shell nanorods. We believe that our findings will be helpful in the design of plasmonic devices based on core-shell nanorods made of simple metals.

最近，由地球上大量低成本金属制成的等离子纳米结构已成为典型的贵重等离子金属的潜在替代物。在这里，我们报告了一种由简单金属Mg，Al和Na原子制成的双金属核-壳纳米棒的光学响应演化的量子力学研究。我们基于计算效率高的时变密度泛函理论进行计算。我们发现，由于原始的核和壳区域之间形成的界面，与原始的纳米棒相比，核-壳纳米棒显示出丰富且增强的光学性能。从我们的计算中得出的最有趣的结果也许是在核-壳纳米棒的情况下光谱强度显着提高。