Anomalies of light transmission in structurally ordered nanocomposites

ISSN： 1071-2836

Source： Journal of Russian Laser Research, Vol.31, Iss.4, 2010-07, pp. : 390-402

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Abstract

We study the optical properties of spatially ordered nanocomposites consisting of spherical nanoparticles. Based on the integral equation method, we derive and investigate the expressions for the fields inside and outside the system. We show that two different states of the system possibly depend on the material and geometric parameters of the nanoaggregate. The states differ by the presence or absence of the forbidden band (an interference reflection peak) in the visible range for photons of definite energy. In the case of dielectric nanoparticles, we show that, if the nanoaggregate is not a photonic crystal in the visible wavelength range, scattering of light by the particles is suppressed in the nanostructure with definite parameters, and the ensemble under study becomes completely transparent. We propose a composite material, which possesses a 100% transmission at some wavelengths and is formed by densely packed dielectric nanospheres. We study the light transmission through an aggregate consisting of metal (gold) nanoclusters and find that, in spite of the fact that absorption is an intrinsic characteristic of metals, in a definite region of the near-IR range of the spectrum, this system is also characterized by an anomalously high transmission of radiation (close to 100%).