We present results of absorbance measurements in the range of 300--900 nm on submicrometer-size solid silver needles with aspect ratios near 7:1. The needles have parallel major axes and are formed on a transparent substrate. The needles are modeled as prolate spheroids with shapes determined from electron micrographs. Absorbance spectra as a function of wavelength, polarization, and angle are compared to theoretical absorbance curves derived from electrodynamic theory.
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Bloemer et al. (1988) studied this question.
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