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Extinction, scattering, and absorption by selected nanoparticle morphologies
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We calculate cross sections using the analytical methods described in
R. Yu, L. M. Liz-Marzán, and F. J. García de Abajo, Chem. Soc. Rev. (2017)
for nanoparticles with the selected morphologies and user-specified
size length L, aspect ratio R, and dielectric function ε(ω).
These calculations are accurate within the ranges
L<200 nm and 1<R<8 for noble-metal nanostructures.†
The size length and aspect ratio are defined for each type of particle in
the schemes below. The incident light polarization is along the direction
of the segment labeled L in the schemes of the particles.
It is important to note that these calculations are only valid in spectral reanges for which the real part of the dielectric function takes negative values.
†Note that, for some geometries, R must be above certain threshold
values (e.g., >1 for rings and >2 for cages).