Challenges in simulation of optical properties of metallic nanoparticles using the discrete dipole approximation
I discuss the accuracy and computational time of the discrete dipole approximation (DDA) when applied to metal nanoparticles. The accuracy of the DDA can be made satisfactory by refining discretization (or increasing number of dipoles), but the required discretization level strongly depends on particle shape and refractive index (or wavelength) as well as on a particular computed quantity of interest. I present certain guidelines for setting the appropriate discretization, but they can not be considered comprehensive. On contrary, the required computational time can be accurately estimated once the number of dipoles is set. For that approximate expression for the required number of iterations of the iterative solver is used, which validity was tested for a wide range of refractive index.
The Fifth International Workshop on Theoretical and Computational Nano-Photonics TaCoNa-Photonics 2012
- Pub Date:
- September 2012
- refractive index;
- Optical constants;
- Nanocrystals and nanoparticles