Herein, we report quasi-static theory-based simulations on size-asymmetric Au and Ag nanosphere dimers in which size-dependent damping induced by the electron-surface interaction is prominent. The sensitivity of plasmon-hybridized modes of both asymmetric nanodimers with respect to the size ratio of the nanospheres forming nanodimer, the refractive index of surrounding medium, nanogap, and the local dielectric perturbation in the surrounding medium in the presence of the semi-infinite substrate is studied systematically. In each case, the theoretical sensitivity value is estimated for parallel and perpendicular polarizations. Moreover, for comparison, the dependence of plasmon modes of size-symmetric nanosphere dimers on the size-dependent damping is investigated.

在本文中，我们报告了基于准静态理论的尺寸不对称Au和Ag纳米球二聚体的模拟，其中电子表面相互作用引起的尺寸依赖性阻尼非常明显。两种不对称纳米二聚体的等离子体激元杂交模式对形成纳米二聚体的纳米球的尺寸比，周围介质的折射率，纳米间隙以及存在半无限大底物的周围介质中的局部介电常数扰动的敏感性被系统地研究。在每种情况下，都针对平行和垂直极化估计理论灵敏度值。此外，为了进行比较，研究了尺寸对称的纳米球二聚体的等离激元模式对尺寸依赖的阻尼的依赖性。