The Experts below are selected from a list of 172281 Experts worldwide ranked by ideXlab platform
Zhijun Sun - One of the best experts on this subject based on the ideXlab platform.
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vertical dielectric sandwiched thin Metal Layer for compact low loss long range surface plasmon waveguiding
Applied Physics Letters, 2007Co-Authors: Zhijun SunAbstract:In this letter, the author proposes a long range surface plasmon waveguide structure of a vertically standing thin Metal Layer sandwiched between finite-width dielectric Layers to achieve both compact and low-loss photonic waveguiding. Rounded 90° bends in such waveguides, with radii of curvature on the scale of the incident wavelength, are studied. The author analyzes waveguiding modes of such waveguides at the straight and bend parts, and also the coupling of surface plasmon waves between them. The analyses are verified with numerical simulations. High transmission of surface plasmon waves through the bends is demonstrated.
W A Ortiz - One of the best experts on this subject based on the ideXlab platform.
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suppression of flux avalanches in superconducting films by electromagnetic braking
Applied Physics Letters, 2010Co-Authors: F Colauto, Jawoong Lee, Sungik Lee, Edgar J Patino, T H Johansen, Eunmi Choi, Mark G. Blamire, W A OrtizAbstract:Magnetic fields perpendicular to superconducting films often trigger vortex avalanches, which always are very harmful for electronic devices and other applications. Such avalanches can be suppressed by a Metal Layer placed in contact with the superconductor surface, an effect that up to now has been thought to be a consequence of improved heat conduction. Here we show experimentally that the role of the Metal Layer is not that of a heat-sink, but rather that of an electromagnetic drag due to eddy currents induced in the Metal Layer during the abrupt onset of the flux avalanches. The effect is demonstrated for films of MgB2 and Nb.
Myeongkyu Lee - One of the best experts on this subject based on the ideXlab platform.
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Structural coloration of stainless steel with planar thin-film surface cavity structure
Optical Materials, 2020Co-Authors: Jaeyong Kim, Minseok Seo, Jong Joo Rha, Myeongkyu LeeAbstract:Abstract The esthetic functions of Metals are becoming increasingly significant, as their application fields are rapidly extending into mobile electronics, home appliances, surface decoration/art, and building interiors. Herein we present a simple surface structure that produces vivid structural colors on stainless steel (STS). The structure consists of a thin Metal Layer deposited on a dielectric film, in which the Metal Layer can adjust the amount of light incident onto the dielectric and strengthens the interference effect. A wide variety of colors, including blue, green, pink, purple, scarlet, and yellow, are produced simply by changing the thicknesses of the dielectric and Metal Layers. An important finding is that the refractive indices of the thermally evaporated Ag and Au Layers are strongly thickness-dependent, which allows color tuning by varying the thickness of the Metal Layer only. Consequently, color images can also be printed by selectively depositing a Metal Layer (Au or Ag) on a uniform dielectric film. The results of this study provide a simple, scalable route to produce vivid structural colors on bulk Metals and may find diverse applications, including surface decoration, product identification, perfect absorbers, and reflective color filters.
F Colauto - One of the best experts on this subject based on the ideXlab platform.
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suppression of flux avalanches in superconducting films by electromagnetic braking
Applied Physics Letters, 2010Co-Authors: F Colauto, Jawoong Lee, Sungik Lee, Edgar J Patino, T H Johansen, Eunmi Choi, Mark G. Blamire, W A OrtizAbstract:Magnetic fields perpendicular to superconducting films often trigger vortex avalanches, which always are very harmful for electronic devices and other applications. Such avalanches can be suppressed by a Metal Layer placed in contact with the superconductor surface, an effect that up to now has been thought to be a consequence of improved heat conduction. Here we show experimentally that the role of the Metal Layer is not that of a heat-sink, but rather that of an electromagnetic drag due to eddy currents induced in the Metal Layer during the abrupt onset of the flux avalanches. The effect is demonstrated for films of MgB2 and Nb.
Philippe Torchio - One of the best experts on this subject based on the ideXlab platform.
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Optical role of the thin Metal Layer in a TiO x/Ag/TiO x transparent and conductive electrode for organic solar cells
RSC Advances, 2016Co-Authors: Bou Adrien, Malika Chalh, Sylvain Vedraine, Bruno Lucas, Damien Barakel, Peres Léo, P.y. Thoulon, Ricci Marc, Philippe TorchioAbstract:One possible alternative to ITO, the most commonly used transparent and conductive electrode (TCE) for Organic Solar Cells (OSCs) and other optoelectronic components, is to use an oxide|Metal|oxide multiLayer. Glass|cathode|ZnO (20 nm)|P3HT:PCBM (250 nm)|PEDOT:PSS (50 nm)|Ag (150 nm) inverted OSC structures are realized, where the cathode can be a TiOx|Ag|TiOx or ITO reference TCE. The sizing of the TiOx|Ag|TiOx (TAT) TCE structure is numerically realized by optimization of the normalized squared electric field inside the active P3HT:PCBM Layer. The optimized TAT design in the whole design is different from the one involving optimization of transparency at the output of the triLayer structure in air. A photovoltaic efficiency of 2.7% is obtained for OSC with the TiOx (22 nm)|Ag (15 nm)|TiOx (19 nm) structure and can be compared to the 3.14% of efficiency obtained with the ITO reference. The short-circuit current density is identified as the crucial photoelectrical parameter. The morphology of the silver Layer in TAT can give rise to an exaltation of the electromagnetic field, leading to an enhanced and undesirable absorption inside the Metal Layer. This exaltation is dependent of the thickness of the Metal Layer and induces changes in current density proportional to the normalized squared electric field inside this Layer. The lost in short-circuit current density is estimated between 0.3 and 0.6 mA cm−2, and is comparable to a thickness variation of 20 nm for both TiOx Layers or 2.5 nm of the silver Layer. We define an exaltation coefficient of the bare electrode, which can be considered as a factor of merit to qualify the quality of the optical role of the silver Layer and thereby of the triLayer electrode.
