A5078369987- Metal and Thin Film Mechanics
- Diamond and Carbon-based Materials Research
- Semiconductor materials and devices
- Plasma Diagnostics and Applications
- Optical Coatings and Gratings
- Carbon Nanotubes in Composites
- Photonic and Optical Devices
- Advanced optical system design
- Advancements in Photolithography Techniques
- Gas Sensing Nanomaterials and Sensors
- Advanced Surface Polishing Techniques
- ZnO doping and properties
- Nanofabrication and Lithography Techniques
- Advanced Optical Imaging Technologies
- Copper Interconnects and Reliability
- Graphene research and applications
- Force Microscopy Techniques and Applications
- Thin-Film Transistor Technologies
- Advanced MEMS and NEMS Technologies
- GaN-based semiconductor devices and materials
- Adaptive optics and wavefront sensing
- Ion-surface interactions and analysis
- Medical Device Sterilization and Disinfection
- Surface Roughness and Optical Measurements
- Acoustic Wave Resonator Technologies
Universidade de São Paulo
2015-2025
Universidade Politecnica
2025
Instituto Butantan
2024
Association of the Technological Integrated Systems Laboratory
2001-2018
University of Duisburg-Essen
2017
European Organization for Nuclear Research
2017
Universidade Brasil
2013
Universidade Cidade de São Paulo
2011
Universidade Estadual de Campinas (UNICAMP)
2006
Hospital Universitário da Universidade de São Paulo
2006
Two-dimensional hexagonal photonic crystals can be recorded using the simple superimposition of two interference patterns rotated by 60 masculine. Such process generates high contrast masks, however, it elliptical cross section structures instead cylinders. We study PBG properties experimentally feasible geometries, this technique and we demonstrate that effect asymmetric shape is a reduction in map area, for TE polarization, comparison with cylindrical structures. On other hand, appears TM...
Thin carbon nitride (CNx) films were synthesized on silicon substrates by reactive RF magnetron sputtering of a graphite target in mixed N2/Ar discharges and the N2 gas fraction discharge gas, F N, varied from 0.5 to 1.0. The atomic bonding configuration chemical composition CNx examined using X-ray photoelectron spectroscopy (XPS) degree structural disorder was studied Raman spectroscopy. An increase nitrogen content film 19 26 at% observed at FN = 0.8 found influence properties; normality...
Graphene is a two‐dimensional material, comprising sp²‐hybridized carbon atoms organized in hexagonal lattice. An application of this material lies resistive random‐access memories (ReRAMs). In work, memory devices with three layers were manufactured. thin films deposited by dip coating on indium tin oxynitride (ITON) electrodes. For the ITON contacts, oxide was evaporated an oxygen atmosphere and subsequently annealed nitrogen flow conventional furnace at different temperatures: 350, 400,...
This work presents the fabrication of a contiguous f/#=f/15 Fresnel microlens array (MLA) by employing low-cost home-built maskless exposure lithographic system based on digital light projector technology using Texas Instruments' micromirror device chip. A continuous diffractive phase relief structure was generated photoresist-coated silicon wafer, replicated in polydimethylsiloxane (PDMS) and electrostatically bonded to glass substrate. The whole time takes 10.8 min expose 2.4×2.4 mm MLA,...
TiN-Ag ceramic coatings deposited by magnetron sputtering on silicon wafers and AISI F138 stainless-steel substrates with different Ag concentrations were evaluated for their application as decorative coatings. The results obtained indicated an almost linear increase in the thickness roughness of film a function silver content film. For greater than (8.3 ± 0.5) at %, matte/satin finish was observed, i.e., dull surface, produced agglomeration particulates roughness, respectively, which...
Deposition of zinc oxide thin films onto silicon and thermally oxidized substrates was performed by radio frequency magnetron sputtering. The obtained were studied in function percentage oxygen argon flow as process gases. Stoichiometric rich conditions, which are more suitable to be p-type doped. Growth over resulted better structural characteristics.
This article presents a method to obtain enhanced frequency resolution two-phase lock-in amplifier (LIA) with two channels in microcontroller using minimum external circuitry. The timer peripheral of the was used generate square wave signals for both excitation and quadrant demodulation, simplifying waveform synthesis when compared use digital-to-analog converters (DACs). To improve generated signals, signal dithered achieve fractional values, while demodulation executed real time...
We present and compare two processes for plasma-based surface modification of Polydimethylsiloxane (PDMS) to achieve the antisticking behavior needed PDMS-PDMS molding. The studied were oxygen plasma activation vapor phase silanization polymerization with tetrafluoromethane/hydrogen mixtures under different processing conditions. analyzed topography changes treated surfaces by atomic force microscopy contact angle measurements. Plasma treatment conducted in a parallel plate reactive ion...
This work presents the fabrication of two-dimensional diffraction gratings in diamond-like carbon (DLC) thin films, with applications computer-generated holography and micro optics. In order to achieve high efficiency have a very simple manufacturing process, device is designed modulate only phase an incoming coherent monochromatic laser beam (632.8 nm, HeNe laser). modulation obtained by implementing binary microrelief DLC film, responsible for generating localized optical path difference...