Birefringent microstructures fabricated by two-photon polymerization containing an azopolymer

Tribuzi, V.; Fonseca, Ruben D.; Corrêa, Daniel S.; Mendonça, Cleber Renato

doi:10.1364/ome.3.000021

Cited by 17 publications

(7 citation statements)

References 23 publications

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“…Laser micronanofabrication technology through two-photon photopolymerization (TPP) of resins has emerged as an interesting tool for the fabrication of micromachines due to their reasonably high spatial resolution and three-dimensional (3D) processing capability [1][2][3][4][5]. To date, various micronanodevices such as moveable needle pairs [6], microoscillators [7], microspring [8], and microrotators [9] have been successfully fabricated through the laser processing.…”

Section: Introductionmentioning

confidence: 99%

A Laser Fabrication of Magnetic Micromachines by Using Optimized Photosensitive Ferrofluids

Tian

Shao

2016

Journal of Nanomaterials

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We report here a laser fabrication of magnetic micromachines by using optimized photosensitive ferrofluids. Fe3O4nanoparticles were prepared by thermal decomposition and subsequent ligand exchange. And then, they were dispersed into photoresist. As a representative illustration, a magnetic microturbine with high surface flatness was fabricated, and its rotation speed could reach as high as 400 rpm under revolving magnetic field.

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Section: Introductionmentioning

confidence: 99%

A Laser Fabrication of Magnetic Micromachines by Using Optimized Photosensitive Ferrofluids

Tian

Shao

2016

Journal of Nanomaterials

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“…The nonlinear nature of the absorptive process confers spatial confinement of the excitation, thus allowing the fabrication of 3D microstructures with flexibility of geometry and submicrometer feature size . In addition to these advantages, the technique also brings the possibility of incorporating a variety of additional material into the polymeric matrix, such as organic dyes and metallic nanoparticles, which can potentially broaden the range of application of WGM microresonators …”

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confidence: 99%

“…17 In addition to these advantages, the technique also brings the possibility of incorporating a variety of additional material into the polymeric matrix, such as organic dyes and metallic nanoparticles, which can potentially broaden the range of application of WGM microresonators. [18][19][20] In 2008, Li et al demonstrated that high-performance polymeric microrings can be directly written via multiphoton absorption polymerization. 21 Since then, femtosecond laser fabrication methods, from two-photon polymerization to femtosecond laser micromachining, as well as different materials and approaches have been exploited to obtain high-Q WGM microresonators.…”

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confidence: 99%

Femtosecond laser fabrication of high‐Q whispering gallery mode microresonators via two‐photon polymerization

Tomázio

Otuka

Almeida

et al. 2017

J Polym Sci B Polym Phys

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Whispering gallery mode microresonators have been triggering considerable advances in science due to their ability to confine light within small dielectric volumes, which makes them suitable for a wide range of applications. Lithographic approaches have been the dominant technique for fabricating microresonators; however, they restrict the choice of materials due to their multistep processing nature. As an alternative, they report the direct laser fabrication of acrylic based hollow microcylinder resonators, via two‐photon polymerization, with good structural integrity and sidewall roughness of 1.5 nm, which make them promising candidates for photonic applications in the near‐infrared. Such polymeric microresonators exhibit finesse close to 103 and a quality factor of 1 × 105, a performance achieved without any additional processing step, which would restrict the choices of materials to be incorporated into the polymeric resonator. This advantage thereby broadens the widespread use of the polymeric microresonators, making them an excellent platform for lasing and nonlinear optics studies in the near‐infrared. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017, 55, 569–574

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“…Nesse sentido, estes micro-objetos podem ser transportados, por exemplo, para o interior do corpo humano visando aplicações em tratamentos clínicos. Outros exemplos de microestruturas tridimensionais fabricadas no volume de materiais incluem o desenvolvimento de guias de ondas em vidro, canais para microfluídica, microestruturas birrefringentes, microlentes, microcircuitos, microbaterias, etc [21][22][23][24]. Deste modo, um grande número de materiais vem sendo explorado pela técnica de microfabricação e estruturação a laser, gerando importantes resultados, visando aplicações tecnológicas desde o desenvolvimento de smartphones com maior resolução e mais capacidade de processamento, até o aumento da eficiência de células solares [25].…”

Section: Introdução E Justificativaunclassified

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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Birefringent microstructures fabricated by two-photon polymerization containing an azopolymer

Cited by 17 publications

References 23 publications

A Laser Fabrication of Magnetic Micromachines by Using Optimized Photosensitive Ferrofluids

A Laser Fabrication of Magnetic Micromachines by Using Optimized Photosensitive Ferrofluids

Femtosecond laser fabrication of high‐Q whispering gallery mode microresonators via two‐photon polymerization

Processamento de superfícies poliméricas com pulsos laser de nano e femtossegundos

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