Femtosecond laser fabrication of waveguides in DR13-doped PMMA

Ferreira, P. H. D.; Stefanutti, R.; Pavinatto, Felippe J.; Mendonça, Cleber Renato

doi:10.1016/j.optcom.2013.12.066

Cited by 9 publications

(9 citation statements)

References 32 publications

(37 reference statements)

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“…The data in Fig. 5 shows a more pronounced change when the laser micromachining is carried out with energies above 1 nJ (the threshold between sample's morphological changes and ablation), indicating that there is a combination of other photochemical processes, such as Coulomb explosion, thermal expansion, polymer carbonization, etc [22,33], leading to sample degradation, as can clearly be seen in Fig. 5 for the sample micromachined with 2 nJ.…”

Section: Resultsmentioning

confidence: 88%

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Microfabrication of electroluminescent polymer for devices construction

Estevam-Alves

Ferreira

Almeida

et al. 2014

Applied Surface Science

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Section: Resultsmentioning

confidence: 88%

“…The beam was focused on the sample surface by a 40× (0.67-NA) microscope objective. More details about the system can be found elsewhere [22]. The sample was moved at a constant speed with respect to the laser beam, using a computercontrolled xyz stage.…”

Section: Methodsmentioning

confidence: 99%

Microfabrication of electroluminescent polymer for devices construction

Estevam-Alves

Ferreira

Almeida

et al. 2014

Applied Surface Science

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“…For instance, the fabrication of tubular waveguides using a Ti:saphire oscillator fs-laser has been reported in PMMA doped with Disperse RED 13 (DR13), which is an organic chromophore [51]. The fabricated waveguides were characterized by optical microscopy, as the one displayed in Figure 2 (top view).…”

Section: Optical Waveguides In Polymersmentioning

confidence: 99%

“…The authors attributed the damaged zone to a carbonized portion of the material originated during the fs-laser fabrication, due to the very high light intensities employed for the fabrication. Figure 3a displays a top view image (by transmission optical microscopy) of an isolated waveguide [51]. Using a HeNe laser beam, the authors coupled light to the waveguides, whose near-field intensity distribution is shown in Figure 3b.…”

Section: Optical Waveguides In Polymersmentioning

confidence: 99%

Ultrafast Laser Pulses for Structuring Materials at Micro/Nano Scale: From Waveguides to Superhydrophobic Surfaces

Corrêa

Almeida

et al. 2017

Photonics

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Abstract:The current demand for fabricating optical and photonic devices displaying high performance, using low-cost and time-saving methods, prompts femtosecond (fs)-laser processing as a promising methodology. High and low repetition femtosecond lasers enable surface and/or bulk modification of distinct materials, which can be used for applications ranging from optical waveguides to superhydrophobic surfaces. Herein, some fundamental aspects of fs-laser processing of materials, as well as the basics of their most common experimental apparatuses, are introduced. A survey of results on polymer fs-laser processing, resulting in 3D waveguides, electroluminescent structures and active hybrid-microstructures for luminescence or biological microenvironments is presented. Similarly, results of fs-laser processing on glasses, gold and silicon to produce waveguides containing metallic nanoparticles, analytical chemical sensors and surface with modified features, respectively, are also described. The complexity of fs-laser micromachining involves precise control of material properties, pushing ultrafast laser processing as an advanced technique for micro/nano devices.

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“…26 apresentam uma mudança mais pronunciada quando a microfabricação laser é realizada usando energias acima de 1,0 nJ (o limiar entre as alterações morfológicas e o processo de ablação da amostra), indicando que existe uma combinação de outros processos fotoquímicos, tais como explosão de Coulomb, expansão térmica, carbonização do polímero etc, conduzindo a degradação da amostra, como pode ser claramente visto na Fig. 26 para a amostra microfabricada com 2,0 nJ [99,100].…”

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Processamento de superfícies poliméricas com pulsos laser de nano e femtossegundos

Alves¹

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comportamento de molhamento anisotrópico. De maneira geral, os resultados aqui apresentados, além de demonstrar a potencialidade das técnicas de microfabricação a laser, fornecem importantes informações sobre os parâmetros ótimos para microfabricação em filmes poliméricos, visando aplicações tanto em dispositivos fotônicos e optoeletrônicos quanto em biomateriais. Palavras chave: Microestruturação. Polímeros. Ablação. Modificação de superfícies. Materiais implantáveis. ABSTRACT Alves, R. E. Polymeric surfaces processing with nano-and femtosecond laser pulses. 2015. 106p. Thesis (doctorate) -São Carlos School of Engineering, University of São Paulo, São Paulo, 2015.In this work we explored the use of laser micromachining methods to structure polymeric materials, aiming to obtain surfaces that can be applied in the development of photonic devices as well as biomedical materials. Firstly, we investigated the influence of pulse energy and translation speed on microstructures fabricated on the surface of poly[2-methoxy-5-(2'ethylhexyloxy)-p-phenylenevinylene] (MEH-PPV) films. We observed that the roughness of the microstructured surface significantly increased with the pulse energy and translation speed.Besides, we determined the energy threshold for material removal, distinguishing the energy range for polymer removal from that causing only structural changes. Once the proper laser micromachining conditions were determined, we were able to apply such approach to fabricate a functional microstructured electroluminescent device, without disrupting the indium tin oxide layer used as the contact for the devices. In the second part of the work, we studied the influence of femtosecond pulses on the structuring process of chitosan films. In this case, we determined the threshold energy that leads to structural change and material removal. We have been able to produced microstructures with hydrophilic characteristics, in addition to surfaces with different structuring that were used to study the formation of Staphylococcus aureus biofilm.For such purpose we produced microstructured areas of 500 μm 2 and different periods (ranging from 4 to 12 µm) on the surface of chitosan and poly(methyl methacrylate)(PMMA) films. With these microstructures we observed different behaviors in the biofilm formation; in the case of PMMA, there was not distinction of development; concerning the chitosan samples we observed preferential bacterial growth on the rougher regions of the microstructures. Lastly, in a third part of the study, we used the method of direct laser interference patterning to fabricate periodic microstructures on polyurethane membranes, using nanosecond pulses. With this method, we produced high quality microstructures on the surface of polyurethane with different periodicity (from 500 nm to 5.0 um). This approach allowed obtaining samples with anisotropic wetting behavior. In general, the results presented here, in addition to demonstrating the potential of the laser micromachining methods to structure polymeric samples, p...

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Femtosecond laser fabrication of waveguides in DR13-doped PMMA

Cited by 9 publications

References 32 publications

Microfabrication of electroluminescent polymer for devices construction

Microfabrication of electroluminescent polymer for devices construction

Ultrafast Laser Pulses for Structuring Materials at Micro/Nano Scale: From Waveguides to Superhydrophobic Surfaces

Processamento de superfícies poliméricas com pulsos laser de nano e femtossegundos

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