Abstract
A new technique for establishing the spectral density and resonance positions of normal optical modes in fine particle systems is outlined and applied to finite chains of closely spaced aluminium cylinders. The method uses multiple conformai frames and a new type of structure factor. Finite chain results are compared to those of the pair and infinite chain on a per particle basis. One key result is the dominance and strong red shift of the fundamental mode as chain length increases beyond a few cylinders. Another is that this fundamental mode is largely isolated in the long UV, visible and NIR wavelength range. Surprisingly long chains (typically > 100 cylinders) are needed to give results resembling the infinite chain, unless gaps are large.
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