Journal
OPTICS EXPRESS
Volume 18, Issue 26, Pages 26915-26928Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.026915
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The potential of random metal-dielectric nanocomposites as constituent elements of metamaterial structures is explored. Classical effective medium theories indicate that these composites can provide a tunable negative dielectric function with small absorption losses. However, the tuning potential of real random composites is significantly lower than the one predicted by classical theories, due to the underestimation of the spectral range where topological resonances take place. This result suggests that a random mixture consisting of a metal matrix with embedded isolated dielectric inclusions is a promising design guideline for the fabrication of tunable composites for metamaterial purposes. (C) 2010 Optical Society of America
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