Rodríguez-Oliveros Rogelio, Sánchez-Gil José A
Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Científicas, Serrano 121, 28006 Madrid, Spain.
Opt Express. 2011 Jun 20;19(13):12208-19. doi: 10.1364/OE.19.012208.
We present an advanced numerical formulation to calculate the optical properties of 3D nanoparticles (single or coupled) of arbitrary shape and lack of symmetry. The method is based on the (formally exact) surface integral equation formulation, implemented for parametric surfaces describing particles with arbitrary shape through a unified treatment (Gielis' formula). Extinction, scattering, and absorption spectra of a variety of metal nanoparticles are shown, thus determining rigorously the localised surface-plasmon resonances of nanocubes, nanostars, and nanodimers. Far-field and near-field patterns for such resonances are also calculated, revealing their nature. The flexibility and reliability of the formulation makes it specially suitable for complex scattering problems in Nano-Optics & Plasmonics.
我们提出了一种先进的数值公式，用于计算任意形状且缺乏对称性的三维纳米粒子（单个或耦合）的光学性质。该方法基于（形式上精确的）表面积分方程公式，通过统一处理（吉列斯公式）对描述任意形状粒子的参数曲面实现。展示了各种金属纳米粒子的消光、散射和吸收光谱，从而严格确定了纳米立方体、纳米星和纳米二聚体的局域表面等离子体共振。还计算了此类共振的远场和近场图案，揭示了它们的性质。该公式的灵活性和可靠性使其特别适用于纳米光学与等离子体学中的复杂散射问题。
