Journal
PHYSICA B-CONDENSED MATTER
Volume 394, Issue 2, Pages 184-187Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physb.2006.12.011
Keywords
sodium; potassium; aluminium; silver and gold nanoparticles; plasmon resonance; superlens; nanolithography
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The optical absorption for nanospheres made from Na, K, At, Ag and An are compared as a precursor to choosing the ideal metal for use in a negative permittivity (NP) near-field superlens. The relationship between optical absorption of the metal nanosphere and the ability of the NP lens to reconstruct the near field is one to one. Metals with low dielectric losses have large plasmon absorption crosssections and absorb over a very narrow wavelength range; they are consequently excellent materials for superlenses. Numerical solutions to Mie theory were used to calculate the absorption efficiency, Q(abs), for nanospheres varying in radius between 5 and 100 nm in vacuum. We show that, although silver is the most commonly used material for superlensing, its absorption efficiency, as a nanosphere, at the plasmon resonance is not as strong as materials such as the alkali metals. Of all these materials, potassium spheres with a radius of 21 nm have an optimum absorption efficiency of 14.7, resulting in the ability of a film with thickness of 40 nm to reconstruct a grating with a period of 57 nm. (c) 2007 Elsevier B.V. All rights reserved.
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