Composite thin films formed by nanometer-sized metal particles embedded in dielectric matrices were fabricated by codepositing the metal and ceramic targets using a pulsed laser deposition technique. The optical absorption properties were measured from 350 to 800 nm, and the absorption peak due to the surface plasmon resonance of metal particles was found. The effects of different metal particles (Au, Ag, Fe, and Co) and embedding matrices (SrTiO3, Al2O3, and TiO2) on the optical absorption properties of the composite films were discussed. Strong absorption peaks can be found in composite films doped with noble metal particles, while most transition metal particles show ordinary absorption patterns. Dielectric properties of metal particles and the refractive index of embedding matrices were responsible for the observed results.
Highly c-axis oriented Rh-doped BaTiO3 thin films were grown on MgO substrates by pulsed laser deposition using a single-crystal Rh:BaTiO3 target. THE 150 nm-thick films were deposited at 800 degrees C under the oxygen pressure of 7 by 10-2 Pa. The structural properties of the samples were characterized by x-ray diffraction and atomic force microscopy. The full width at half-maximum of the (002) Rh:BaTiO3 rocking curve and the root-mean-square surface roughness within the 5 by 5 micrometers 2 area were 0.520 degrees and 0.85 nm, respectively. The nonlinear optical properties of the films were determined by a single beam z-scan at a wavelength of 532 nm with laser duration of 10 ns. The result shows that Rh:BaTiO3 thin films exhibit a great nonlinear optical response with the real and imaginary parts of the third-order nonlinear optical susceptibility (chi) (3) being 3.59 X 10-7 esu and 4.01 X 10-8 esu, respectively.
A novel holographic method of making hard copies of a three- dimensional image from the computer data, the dot array rainbow hologram (DARH), is introduced and analyzed. The DARH is recorded dot by dot using a 1D liquid crystal panel and our proposed projection algorithm, and can reconstruct 3D image with horizontal parallax under white light illumination. The principle of making DARH and holo- animation are discussed. Preliminary experimental result showing effectiveness of this method is also presented.