Optimisation of absorption efficiency for varying dielectric spherical nanoparticles

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Conference Proceeding
ICONN2006, 2006, pp. 556 - 559
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In this paper we compare tje optical absorption for nanospheres made from a range of transition and alkali metals from li (A=3) to Au (A=79). numerical solutions to Mie theory were used to claculate the absorption efficiency for nanospheres varying in radii between 5nm and 100 nm in vacuum. We show that although gold is the most commonly used nanoparicle material, its absorption efficiency at the lasmon resonance is not as strong as materials such as the alkali metals. Of all the materials tried, potassium spheres with a radius of 21 nm have an optimum absorption efficiency of 14.7. in addition we also show that, unlike gold, the wavelength of the plasmon peak in other materials is sensitive to the sphere radius. In potassium the peaporition shifts by 100 nm for spheres ranging from 5 nm to 65 nm, the shift is less than 10 nm for gold spheres.
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