Optical properties of aggregated gold on aluminum. Two multilayer film designs especially suitable for producing mirror coatings with low visible and high infrared reflectance are described. consistent with an interband transition. In one example of this design, consisting of Al–SiO–Al–SiO, the low-reflectance region extends from 0.4µ to 1.5µ and more than 90% reflectance is obtained for all wavelengths longer than 3µ. Roy. The magnitude of the reflectance increases with metal concentration. Application of effective-medium theory implies an intrinsic dc A There is some evidence that these defects may not be homogeneously distributed throughout the material. 24, 636 (1935). The measured dc values have thus far been limited by the low-density measurements in the frequency range from the middle ir (0.1 eV) through PDF | The reflectance in the infrared and visible ... and effective linear optical responses for one-bond, two-bond and three-bond clusters, as well as for various disordered composites. spectrum and also to increase their photoconductivity. Dielectric resonance, local field distribution, and optical response in 3D resonant composites, Optical and electrical conductivity of polyaniline. investigated by a combination of optical-absorption and -reflection The main feature of the data is a decreasing reflec- tance with increasing frequency. J. I. Gittleman and B. Abeles, Phys. Optical Reflectance Measurements for Commonly Used Reflectors conductivity for metallic A203, 385 (1904). The absorption data are consistent with a direct We find that for the visible exhausts the oscillator strength sum rule for π electrons © 2008-2020 ResearchGate GmbH. Kramers-Kronig analysis of the reflection data has been carried out to Instrument An instrument for measuring the angular distribution of reflectance has been designed and built [22]. The band structure and electronic properties of pure and heavily doped J. C. Maxwell-Garnett, Philos. The volume fraction, f, of metal in the samples studied was between f = 0.03 and f - 1. All rights reserved. Journal of the Optical Society of America. Phys. When we increase the concentration of impurity bonds, a blue shift of IPR peaks occurs in 3D, while in 2D, these peaks are very stable. Berger L. Forro G.G. Trans. undoped semiconducting polymer, the strong transition observed in the obtain σ(ω) and ɛ(ω). the visible (4.0 eV). In the first design aluminum is coated with evaporated films of germanium and silicon monoxide, each film approximately one-quarter wavelength thick. METHODS A. For the disordered composites in 2D and 3D, inverse participation ratios (IPR) with q = 2 are used to represent the localization of the field. Evaporated films of germanium and silicon have been irradiated at 14K in high vacuum with saturation doses of 100 keV Ge** plus and Si** plus ions respectively. In one example using. For f - 0.15 the specimens exhibited finite dc conductivity. The changes introduced by bombardment were reversible on annealing to 300K, after an initial bombardment and anneal. The reflectance in the infrared and visible (0.08 eV to 3.2 eV) has been measured for aluminum small particles compacted into potas- sium chloride. conductivity obtained from Kramers-Kronig analysis of the metallic Electronic structure of polyacetylene: Optical and infrared studies of undoped semiconducting (CH)x... Mirror Coatings for Low Visible and High Infrared Reflectance. Scitation is the online home of leading journals and conference proceedings from AIP Publishing and AIP Member Societies, H.H. III. SOME EFFECTS OF ION BOMBARDMENT IN ELEMENTAL DISORDERED FILMS. fibril morphology. (Leipz.) For the same resonance, the intensity of the local-field in 3D is also weaker than that in the 2D case, but the fields are more localized than those in 2D. The effect of single and multilayer coatings on the reflectance of metals is discussed. Comparison of experiment with simple theories shows that the self consistent theory predicts the general form of the reflectance if the low concentration for first achieving conduction is taken into consideration. Rev. Reflectance and Texture of Real-World Surfaces KRISTIN J. DANA Columbia University BRAM VAN GINNEKEN Utrecht University SHREE K. NAYAR Columbia University JAN J. KOENDERINK Utrecht University In this work, we investigate the visual appearance of real-world surfaces and the dependence of appearance on the geometry of imaging conditions. The effects of prolonged heating at 350 degrees. The frequency-dependent In situ measurements showed that the effect of bombardment on the films was to enhance their electrical conductivity in a manner consistent with variable range hopping, to increase their optical absorption in the near IR and visible, The optical reflectances of evaporated deposits of gold on aluminum have been measured in the visible and IR regions. Join ResearchGate to find the people and research you need to help your work. Margaritondo. Due to the different values of Greens function in 2D and 3D, for the same cluster, the values of the dielectric resonances in 3D are smaller than those in 2D, but the fields are more localized than those in 2D. These effects are believed to arise from changes in the localized state density and distribution in the forbidden gap owing to the introduction of defects into the random network by the irradiation.

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