Far-infrared absorption by aluminum small particles

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Abstract
The far-infrared (FIR) absorption of small particles has been studied for a variety of sizes of aluminum small particles. The particle size dependence of the FIR absorption coefficient was obtained. In addition, the FIR absorption coefficients of clustered samples and nonclustered random samples were measured. The small-particle composite samples were characterized with scanning-transmission electron microscope analyses. Our data suggest that individual small particles are responsible for the anomalous FIR absorption. Also, we found a particle size dependence of the FIR absorption coefficient which differs from the predictions made by classical theory. These discrepancies imply that the Drude model may not be an adequate description of FIR dielectric function of small metal particles.