Optical Absorption Modeling of Arbitrary Shaped Nanoparticles

摘要

Limitations of a method for modeling the optical absorption spectra of nanosize particles is explored. Computer software has been developed to predict absorption peaks based on the particle's geometry. The software breaks the particle's surface into small sites and builds a matrix describing site to site surface polarization interactions. From this matrix the particle's normal mode resonances are determined. With the method it is possible to simulate nearly any geometrical shape. Cubes with cut corners or edges, such as chemically fabricated silver particles are possible. Long, thin bars are also candidates for simulation. Results dependence on surface resolution is explained.