Normalized extinction spectra of two different agglomerate structures (4 linear and diamond) obtained from the three different theoretical methods: DDA results (panels a,b); T-matrix results (panels c,d); FDTD results (panels e,f). The unpolarized spectra represent averages of the two polarization directions. The result of Mie theory for single spheres is shown for comparison. The values in parentheses indicate the peak positions ( μm).
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