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Graphene based devices have seen an enormous amount of published literature since its isolation 6 years ago, however processing issues and wafer size material availability have proven to be the most demanding tasks in fabrication of graphene devices. This work focuses on some of the main technological issues relating to realization of graphene based devices. Solutions and current techniques are shortly...
GeSiO nanosystems were obtained using two different preparation methods, sol-gel and magnetron-sputtering. Transmission electron microscopy measurements were performed to investigate the films structure. Amorphous and crystalline Ge dots embedded in amorphous silicon dioxide were observed. The Ge concentration in the GeSiO films was by Energy-dispersive X-ray spectroscopy.
Results of SEM characterization of CNT film grown on nanoporous silicon (NP-Si) plate covered with 2 step PVD/CVD layer are presented. SEM studies were performed for all stages of CNT film preparation process. It was found that the size of pores in NP-Si affects the final CNT film form and adhesion.
Nanostructured multilayered Fe2O3 films have been deposited onto commercial glass slides by spray pyrolysis using FeCl3 solution and nitrogen as carrier gas. The influences of thermal treatment and of the number of layers on the optical properties of the films have been studied. Structural investigations on the films were performed using X-ray diffraction.
In this paper are presented the results of grating light valve (GLV) structure simulation using Coventorware software in order to maximize the intensity of diffracted light in the ±1 diffraction orders. Was simulated a GLV element which consists from 6 high reflective micro-beams suspended above a silicon substrate and which are electrostatically actuated. By simulation are optimized the length, width...
Resonant grating filters are promising alternatives to conventional spectral filters for narrowband free-space filtering. The high performances achieved experimentally by such filters in the near infrared have lead to a study of resonant grating filters in the mid infrared. In this paper, we show that GaAs/AlGaAs system is an interesting system for the realization of such filters and that limitations...
Gold nanoparticles (AuNP) continue rising a strong interest for research and especially in the field of biosensors as attested by growing number of publications. One reason is that AuNP exhibit an optical response dominated by the localised surface plasmon resonance (LSPR) that is highly sensitive to the molecular environment. This paper describes the preparation of monodisperse supported AuNP and...
Hot embossing is a promising technology which can be integrated in a process chain for cost effective production of planar lighting optics. Polyamide polymer material was selected in order to fulfil the requirements of the process: embossing, conductive coating process followed by the electro deposition and removal of the substrate to produce the final master. However, it has been further optimised...
Backlight units are the most relevant element in display with respect to the energy consumption. In addition, the quality of backlight units in terms of brightness, homogenous light distribution, and the angle of light radiation, dramatically influence the overall quality of a display. Within this paper a new approach for the production of complex micro optics on large surfaces is presented. The technology...
This paper presents the design and manufacturing of a metamaterial Composite Right/Left Handed (CRLH) directional coupler on silicon substrate in coplanar waveguide (CPW) configuration, with a frequency band between 26-28 GHz. The design makes use of 4 CRLH cells, cascaded and coupled two by two in order to obtain the directional coupler structure. The device was processed on a 500μm thick silicon...
This paper presents the electromagnetic modelling and design of several millimetre wave components and circuits fabricated using Low-Temperature Co-fired Ceramic technology. The circuits include embedded transmission lines and vertical transitions designed to operate in the W band.
The paper describes the simulation techniques used and results for the design of a 60 GHz antenna on package. Simulations performed with Zeland IE3D and analysis by Mathematica are presented and compared in order to get the 3D simulator in a correct setup for the 60 GHz antenna. The radiation efficiency is analyzed for different antenna topologies by the Zeland IE3D method of moments simulator; some...
Multi-layered Al:ZnO thin films, with wurtzite - type structure and thickness up to 120 nm, as determined by x-ray diffraction and HRTEM, were grown on Si-SiO2 and glass substrates by the sol-gel method. Fluorescence spectroscopy measurements show that 0.5 at.% Al doping determines a blue shift of the emission band observed at 387nm in the undoped material. The room temperature conductivity increases...
In this paper we present results of SEM, XRD and EXAFS studies of palladium-carbon nanostructural films prepared in two-steps method on pure and oxidized silicon substrates. Structural, topographical and morphological differences were found between films deposited on those substrates.
We report successful deposition of polycrystalline InN thin films on un-etched Si wafers, without nucleation buffer, by reactive RF magnetron sputtering in pure N2 atmosphere. The modification of the structural and morphological characteristics of InN films are presented, as function of deposition pressure and deposition temperature.
This paper presents the simulation results of the gate-controlled diode, working in the analog regime. The aim of the paper is to find the device macromodel that provides an optimum linearity of the junction voltage versus the gate voltage, at a given current. The lateral pn junction is simulated in the breakdown regime and the gate voltage biases the MOS capacitor in deep depletion. Finally, linearity...
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