Highly ordered arrays of organic–inorganic nanophotonic composites

Highly ordered organic–inorganic nanocomposite arrays formed by filling anodized aluminum oxide nanopores (50 nm size) with Rhodamine 123 (Rh123) dye has been studied by visible absorptive, fluorescent spectroscopy, and atomic force/scanning electron microscopy techniques in this work. The absorbance and fluorescence spectra are found to drastically differ from that of conventional Rh123 films deposited onto flat substrates. The molecular assemblies in the nanopore array are mostly monomer-like, the fluorescence yield is many times higher than the conventional film counterpart and increases after exposure to intense laser illumination, and the fluorescence polarization dependence indicates a preferred molecular orientation along the pore axis. Such nanocomposite arrays open up opportunities in engineering molecular assemblies and in creating functional materials of superior properties for future nanophotonics.

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