Yang Yanhe, Xie Hao, You Jian, Ye Weixiang
School of Physical Science and Technology, Soochow University, Suzhou 215006, China.
Department of Physics, School of Science, Hainan University, Haikou 570228, China.
Phys Chem Chem Phys. 2022 Feb 16;24(7):4131-4135. doi: 10.1039/d1cp05235g.
Noble metal nanoparticles have been utilized for a vast amount of optical applications. For applications that use metal nanoparticles as nanosensors and for optical labeling, higher radiative efficiency is preferred. To get a deeper knowledge about the radiation damping of noble metal nanoparticles, we used gold nanorods with different geometry factors (aspect ratios) as the model system to study. We investigated theoretically how the radiation damping of a nanorod depends on the material, and shape of the particle. Surprisingly, a simple analytical equation describes radiation damping very accurately and allows the disentanglement of the maximal radiation damping parameter for gold nanorods with resonance energy around 1.81 eV (685 nm). We found very good agreement with theoretical predictions and experimental data obtained by single-particle spectroscopy. Our results and approaches may pave the way for designing and optimizing gold nanostructures with higher optical signal and better sensing performance.
贵金属纳米粒子已被用于大量光学应用中。对于将金属纳米粒子用作纳米传感器和光学标记的应用，更高的辐射效率是优选的。为了更深入地了解贵金属纳米粒子的辐射阻尼，我们使用具有不同几何因子（纵横比）的金纳米棒作为模型系统进行研究。我们从理论上研究了纳米棒的辐射阻尼如何取决于粒子的材料和形状。令人惊讶的是，一个简单的解析方程能非常准确地描述辐射阻尼，并能解开共振能量约为1.81电子伏特（685纳米）的金纳米棒的最大辐射阻尼参数。我们发现与通过单粒子光谱获得的理论预测和实验数据非常吻合。我们的结果和方法可能为设计和优化具有更高光学信号和更好传感性能的金纳米结构铺平道路。
