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Surface resonance properties of pure Cu and Cu80Zr20 metallic glass films with nanoparticles induced by pulsed-laser dewetting process
摘要： Pure Cu and Cu80Zr20 thin films with a thickness of 10 nm were deposited on glass substrates using a high-vacuum sputtering system. A pulsed-laser dewetting process was then performed using a NIR laser system. For the pure Cu film, nanoparticles were produced for the accumulated energy (AE) densities in the range of 0.6~11 J/cm2. The particle size was found to increase with increasing scanning speed and repetition rate, and with decreasing power. For the Cu80Zr20 thin film, nanoparticles were formed under all AE values under consideration. The nanoparticles consisted almost entirely of Cu; with the Zr atoms being repelled to the bottom of the nanoparticle and surroundings. The optical absorption peak wavelengths for the Cu and Cu80Zr20 films produced under different dewetting conditions all lay in the range of 580~700 nm. Hence, it was inferred that the nanoparticles produced in the two films had a similar size, shape and composition.
关键词： surface resonance properties,Pulsed-laser dewetting,metallic glass,nanoparticle
更新于2025-09-12 10:27:22
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Scattering of a Plane Electromagnetic Wave by a Multilayer Spherical Lens
摘要： We propose an analytical solution of the problem of diffraction of a plane electromagnetic wave by a multilayer dielectric (including plasmon) sphere. The solution is obtained using the method of separation of variables. New efficient recurrence relationships are obtained for calculations of the fields in layers, as well as formulas for the fields in the near and far diffraction zones. The novelty of the proposed solution is connected with the way of representing its radial part in the form of normalized functions. It is shown that as the number of the lens layers, which approximate the smooth profile of dielectric permittivity, grows, the electric field at the focusing point increases and reaches the maximum value. This allows one to determine the minimum required number of layers in practical problems. Resonance properties of metal-dielectric nanoparticles are studied in the optical band.
关键词： diffraction,multilayer dielectric sphere,plane electromagnetic wave,separation of variables,optical band,metal-dielectric nanoparticles,resonance properties,recurrence relationships,focusing point
更新于2025-09-10 09:29:36