ScattPort 9. March 2009

Near field computations

Thomas Wriedt
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Recently there seems to be increasing interest in computing the near field or the internal field by scattering particles. There is especially interest in morphological resonances and in plasmon resonances. There are not that many programs available which focus on near field computation.
The T-Matrix programs by P. W. Barber and S.C. Hill allow simulating the internal and external intensity distribution by a scattering sphere.

Near field and internal field computations of a spherical particle in a Gaussian laser beam can be done using the Windows program GLMT Champ Internes by Loic Mees.

If you like to compute near fields by a number of scattering spheres you can use the extension of Yu-lin Xu's GMM program by Moritz Ringer. He extended GMM working on his PhD thesis [1]. His Fortran Program GMM-Field allows computing the near field. GMM-Dip gives the near field with a dipole as incident field. Apparently Giovanni Pellegrini did a similar extension of the GMM program in this PhD thesis [2]. The LightScatPro matlab program by Sylvain Lecler used for his thesis [3] is also suitable for near field computation by a number of spheres.

To compute near fields by arbitrarily shaped particles you can off cause apply any FDTD program but other programs have recently also been extended for efficient near field computation. There is DDSCAT by Bruce Draine and Priotr Flautau. This program now allows near field computations. Another variant of the program DDA_field by  Serdar Ogut and Juan C. Idrobo also gives near field results.

The Fortran program MMP 3D by Christian Hafner, Lars Bomholt is also very well suited to compute near field by scattering nonspherical particles. There is a new version of this program including a GUI called OpenMaX.




References

[1] Moritz Ringler: Plasmonische Nahfeldresonatoren aus zwei biokonjugierten Goldnanopartikeln. Dissertation Ludwig Maximilians Universität, München 2008.
[2] Giovanni Pellegrini: Modeling the optical properties of nanocluster-based functional plasmonic materials. Tesi di dottorato, Università degli Studi di Padova, Padova 2008.
[3] Sylvain Lecler: Etude de la diffusion de la lumière par des particules sub-microniques. Thèse. l’Université Louis Pasteur, Strasbourg 2005.