Microstructures and Optical Properties of LiNbO3 Sequentially Implanted with Ag and Cu Ions

概要

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Microstructures of LiNbO3 sequentially implanted with Ag and Cu ions were investigated in connection with changes in optical properties induced by heat treatment. Ag and Cu ions were implanted into LiNbO3 single crystals at energies of 4.2 and 3.0 MeV, respectively, to ensure an overlap of the depth distribution for both metals. Samples were heated in air for 1 h at temperatures up to 800 °C, and the optical absorption spectra of the samples were measured in the visible region. For the as-implanted samples, two large absorption peaks appeared at 473 and 574 nm, which correspond to absorptions due to the surface plasmon resonance of Ag and Cu nanoparticles, respectively. When the sample was heated at high temperatures, the intensities of the absorption peaks gradually decreased. After being heated at 500 °C, the spectra showed only one peak at 550 nm. For the sample heated at 800 °C, the absorption peak almost disappeared, and the samples became colorless. Changes in the microstructure induced during the annealing processes were examined by scanning transmission electron microscopy (STEM) and energy dispersive X-ray spectroscopy (EDX).
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2008-09-25