Author
Akira Kinbara
Bio: Akira Kinbara is an academic researcher from University of Tokyo. The author has contributed to research in topics: Thin film & Sputtering. The author has an hindex of 26, co-authored 116 publications receiving 2211 citations.
Topics: Thin film, Sputtering, Adhesion, Carbon film, Amorphous solid
Papers published on a yearly basis
Papers
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TL;DR: In this article, the authors derived the relation between the peak wavelengths of absorption bands in terms of the model based on a two-dimensional distribution of island particles and proposed the method for the determination of the inter-island dielectric constant ∊a.
Abstract: An aggregated silver film shows absorption bands in the visible and the near-ultraviolet spectral regions caused by the plasma resonances of conduction electrons in the island particles composing the film, for electric fields parallel and perpendicular to the substrate. We derive the relation between the peak wavelengths of absorption bands in terms of the model based on a two-dimensional distribution of island particles and propose the method for the determination of the inter-island dielectric constant ∊a. The method is applied to aggregated silver films and the thickness dependence of ∊a is found.
42 citations
TL;DR: The work functions of the LaB6 thin films fabricated at 300, 750 and 1000 K had values of 2.7 eV and 2.8 eV, respectively as discussed by the authors.
41 citations
TL;DR: In this article, the changes of the optical properties of aggregated silver films were investigated with an automatic recording ellipsometer immediately after deposition in vacuum and after admission of air into the vacuum chamber.
Abstract: The changes of the optical properties of aggregated silver films were investigated with an automatic recording ellipsometer immediately after deposition in vacuum and after admission of air into the vacuum chamber. The optical properties change for several minutes after the vapor stream is cut off from the substrate. By analyzing the changes with the model based on the two-dimensional distribution of island particles in the shape of ellipsoids of rotation (modified RE model), we found that these changes correspond to the decrease of the mean axial ratio of the island particles composing the film and the standard deviation of the distribution function of the axial ratio. That is, the flat island becomes globular after deposition. Such a morphological change of the particle is interpreted in terms of mass transport accompanied by surface self-diffusion. The changes followed by exposure to air can be interpreted by the formation of a layer of dielectric pellicle, such as an adsorption layer or a sulfide layer surrounding the island particles.
39 citations
TL;DR: In this paper, the complex dielectric constant of an aggregated metal film is represented by the equation e−e = q e i −e a 1+ ƒ(e i − e a ) e a ǫ = −0.36 d w α for an electric field parallel to the substrate.
35 citations
TL;DR: In this article, the effect of annealing on the electronic structure of unannealed and annealed gold films was investigated and the following results were obtained: the specularity parameter was increased by the annaling and was dependent on the temperature.
34 citations
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02 Feb 2004TL;DR: The role of stress in mass transport is discussed in this article, where the authors consider anisotropic and patterned films, buckling, bulging, peeling and fracture.
Abstract: 1. Introduction and overview 2. Film stress and substrate curvature 3. Stress in anisotropic and patterned films 4. Delamination and fracture 5. Film buckling, bulging and peeling 6. Dislocation formation in epitaxial systems 7. Dislocation interactions and strain relaxation 8. Equilibrium and stability of surfaces 9. The role of stress in mass transport.
1,562 citations
TL;DR: In this article, the metastable phase anatase has been shown to have a wider optical absorption gap than rutile thin films, which is consistent with the high mobility, bandlike conduction observed in anatase crystals.
Abstract: Electrical and optical spectroscopic studies of TiO2 anatase thin filmsdeposited by sputtering show that the metastable phase anatase differs in electronic properties from the well‐known, stable phase rutile. Resistivity and Hall‐effect measurements reveal an insulator–metal transition in a donor band in anatase thin films with high donor concentrations. Such a transition is not observed in rutile thin films with similar donor concentrations. This indicates a larger effective Bohr radius of donor electrons in anatase than in rutile, which in turn suggests a smaller electron effective mass in anatase. The smaller effective mass in anatase is consistent with the high mobility, bandlike conduction observed in anatase crystals. It is also responsible for the very shallow donor energies in anatase. Luminescence of self‐trapped excitons is observed in anatase thin films, which implies a strong lattice relaxation and a small exciton bandwidth in anatase. Optical absorption and photoconductivity spectra show that anatase thin films have a wider optical absorption gap than rutile thin films.
1,560 citations
TL;DR: In this paper, a statistical growth model based on the Central Limit Theorem has been formulated for liquid-like coalescence of particles; this theory accounts satisfactorily for all the data, as well as for most size distributions published in the literature.
Abstract: In this paper we present a novel and versatile t e c h n i q u e f o r t h e p r o d u c t i o n o f u l t r a f i n e m e t a l p a r t i c l e s by evaporation from a temperature‐regulated oven containing a reduced atmosphere of an inert gas. An extensive investigation of particles of oxidized Al, with diameters of 3 to 6 nm, has been performed. We have also studied ultrafine particles of Mg,Zn, and Sn produced in the same manner. A supplementing investigation has been carried out for particles of Cr, Fe, Co, Ni, Cu, and Ga, as well as larger Al particles, produced by ’’conventional’’ inert‐gas evaporation from a resistive filament. Diameter as a function of evaporation rate, inert‐gas pressure, and the kind of inert gas are reported. Crystalline particles smaller than 20 nm look almost spherical in the electron microscope, while larger ones often display pronounced crystal habit. S i z e d i s t r i b u t i o n s have been investigated in detail, and consistently the logarithm of the particle diameter has a Gaussian distribution to a high precision for the smallest sizes, whereas larger particles deviate from such a simple behavior. A statistical growth model, based on the Central Limit Theorem, has been formulated for liquidlike coalescence of particles; this theory accounts satisfactorily for all our data, as well as for most size distributions published in the literature. Applications of the model to colloids, discontinuous films, and supported catalysts are discussed. By comparing size distributions for particles produced by a variety of techniques we found a number of empirical rules for the width of the distributions, as defined by a (geometric) standard deviation σ. For crystalline inert‐gas‐ evaporated particles we obtained consistently 1.36?σ?1.60; for coalescing islands in discontinuous films we found 1.22?σ?1.34; and similar rules are applicable to colloids, supported catalysts, and to ultrafine droplets.
1,483 citations
TL;DR: In this article, the authors developed a surface-enhanced Raman scattering (SERS) model of adsorbates on metal surfaces, where the long-range enhancement by resonances of the macroscopic laser and Stokes field is separated quantitatively from the metal electron-mediated resonance Raman effect.
Abstract: On the basis of different types of experiments, the authors develop implicitly the model of surface-enhanced Raman scattering (SERS) of adsorbates on metal surfaces. The long-range enhancement by resonances of the macroscopic laser and Stokes field is separated quantitatively from the metal electron-mediated resonance Raman effect. The latter mechanism proceeds by increased electron-photon coupling at an atomically rough surface and by temporary charge transfer to orbitals of the adsorbates. This model can account for the chemical specificity and vibrational selectivity of SERS and (partly) for the SERS specificity of the various metals.
1,312 citations
TL;DR: In this article, the basic physics and applications of planar metamaterials, often called metasurfaces, which are composed of optically thin and densely packed planar arrays of resonant or nearly resonant subwavelength elements, are reviewed.
1,047 citations