A5056742208- Laser Material Processing Techniques
- Nonlinear Optical Materials Studies
- Advanced Fiber Laser Technologies
- Optical Coherence Tomography Applications
- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Ocular and Laser Science Research
- Glass properties and applications
- GaN-based semiconductor devices and materials
- Photonic Crystals and Applications
- Laser-induced spectroscopy and plasma
- Solid State Laser Technologies
- Plant-Derived Bioactive Compounds
- Thin-Film Transistor Technologies
- Nonlinear Optical Materials Research
- Analytical Chemistry and Sensors
- Random lasers and scattering media
- Silk-based biomaterials and applications
- Surface Roughness and Optical Measurements
- Physical Education and Sports Studies
- Nanofabrication and Lithography Techniques
- Silicon Nanostructures and Photoluminescence
- Diamond and Carbon-based Materials Research
- Cultural Heritage Materials Analysis
- Orbital Angular Momentum in Optics
Universidade Federal de Uberlândia
2019-2023
Universidade de São Paulo
2013-2022
Universidade Federal de São Carlos
2013-2019
Czech Academy of Sciences, Institute of Physics
2017
The current demand for fabricating optical and photonic devices displaying high performance, using low-cost time-saving methods, prompts femtosecond (fs)-laser processing as a promising methodology. High low repetition lasers enable surface and/or bulk modification of distinct materials, which can be used applications ranging from waveguides to superhydrophobic surfaces. Herein, some fundamental aspects fs-laser well the basics their most common experimental apparatuses, are introduced. A...
ABSTRACT Whispering gallery mode microresonators have been triggering considerable advances in science due to their ability confine light within small dielectric volumes, which makes them suitable for a wide range of applications. Lithographic approaches the dominant technique fabricating microresonators; however, they restrict choice materials multistep processing nature. As an alternative, report direct laser fabrication acrylic based hollow microcylinder resonators, via two‐photon...
We investigated the effect of temporal shaped femtosecond pulses on silicon laser micromachining. By using sinusoidal spectral phases, pulse trains composed sub-pulses with distinct separations were generated and applied to surface produce Laser Induced Periodic Surface Structures (LIPSS). The LIPSS obtained different sub-pulse separation analyzed by comparing intensity two-dimensional fast Fourier Transform (2D-FFT) AFM images ripples It was observed that amplitude is more emphasized for...
Materials specially designed for photonics have been at the vanguard of chemistry, physics and materials science, driven by development new technologies.One particular class investigated in this context are glasses, that principle should exhibit high third order optical nonlinearities fast response time, whose properties can be tailored compositional changes, such as, instance, incorporation metallic nanoparticles to explore plasmon resonances.Simultaneously novel materials, motivated need...
The development of advanced photonics devices requires materials with large optical nonlinearities, fast response times and high transparency, while at the same time allowing for micro/nano-processing needed integrated photonics. In this context, glasses have been receiving considerable attention given their relevant properties which can be specifically tailored by compositional control. Corning Gorilla® Glass (strengthened alkali aluminosilicate glass) is well-known its use as a protective...
Gallium nitride (GaN) has been established as a promising candidate for integrated electro-optic and photonic devices, aiming at applications from optical switching to signal processing. Studies of its nonlinearities, however, lack spectral coverage, especially in the telecommunications range. In this study, we measured two-photon absorption coefficient (β) nonlinear index refraction (n2) GaN visible near-infrared by using femtosecond laser pulses. We observed an increase β (1.0 ± 0.2) (2.9...
This work aimed to assess the influence of different structured substrates with hydrophilic and hydrophobic properties on micro nano topographies developed titanium alloys over pre-osteoblastic cell behavior. Nano topography influences small dimension levels morphology by inducing filopodia formation in membranes, irrespectively wettability behavior surface. Therefore, nanostructured surfaces titanium-based samples using techniques surface modification processing, such as chemical...
Here we demonstrate resonant random lasing in Rhodamine B-doped polymeric microstructures fabricated by means of femtosecond laser writing via two-photon polymerization. To the best our knowledge, this is first demonstration action on-chip microdevices. Their feedback mechanism relies on diffuse reflections at structure sidewall surfaces, which known as spatially localized since scattering centers lie over edges gain medium. By exciting structures with a pulsed 532 nm, multimode emission...
Lead oxide is an important glass modifier not only for affecting the chemical and mechanical stabilities of glasses, but also improving their thermal optical properties. Since specific properties are associated with presence PbO, its crystallization to enhance material performance. Although considerable advances have been achieved regarding fabrication glass-ceramic from lead-based spatial confinement remains challenging. Direct laser writing (DLW) has considered essential technique overcome...
In this work, we performed the nonlinear characterization of Gorilla Glass waveguides produced by fs-laser microfabrication with different writing parameters. Their refractive index n2 was determined dispersive-scan technique. We found that values are lower than one for pristine material and they depend on Raman spectroscopy measurements showed important structural modifications related to non-bridging oxygens (NBOs) irradiated glass, which may lead reduction third-order polarizability.
Carbon nanotube composites are promising materials for mechanical and electrical applications. However, methodologies to incorporate carbon nanotubes in polymeric matrices on high demand, especially fabricating devices the micro-nanoscale. In this paper we show fabrication of 3D microstructures with functionalized single-walled (SWCNT), by means two-photon polymerization (2PP). We used a range SWCNT concentrations (0.01-1 wt%) resin fabricate composite material. Scanning electron microscopy...
Abstract Cellulose‐based flexible electronics has prompted as an interesting approach for the development of novel technologies, given its unique properties. Standard printing methods, however, limit materials to be transferred, well resolution patterns. In this paper use femtosecond laser induced forward transfer is demonstrated, creating high‐resolution patterns conductive poly(p‐phenylene vinylene) (PPV), advanced material that presents outstanding electrical properties, on bacterial...