Готові списки джерел за темами / Two-photon polymerization lithography

Добірка наукової літератури з теми "Two-photon polymerization lithography"

Автор: Grafiati

Опубліковано: 14 березня 2023

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Статті в журналах з теми "Two-photon polymerization lithography"

Purtov, Julia, Peter Rogin, Andreas Verch, Villads Egede Johansen, and René Hensel. "Nanopillar Diffraction Gratings by Two-Photon Lithography." Nanomaterials 9, no. 10 (October 19, 2019): 1495. http://dx.doi.org/10.3390/nano9101495.

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Two-dimensional photonic structures such as nanostructured pillar gratings are useful for various applications including wave coupling, diffractive optics, and security features. Two-photon lithography facilitates the generation of such nanostructured surfaces with high precision and reproducibility. In this work, we report on nanopillar diffraction gratings fabricated by two-photon lithography with various laser powers close to the polymerization threshold of the photoresist. As a result, defect-free arrays of pillars with diameters down to 184 nm were fabricated. The structure sizes were analyzed by scanning electron microscopy and compared to theoretical predictions obtained from Monte Carlo simulations. The optical reflectivities of the nanopillar gratings were analyzed by optical microscopy and verified by rigorous coupled-wave simulations.

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Yang, Da, Shalin J. Jhaveri, and Christopher K. Ober. "Three-Dimensional Microfabrication by Two-Photon Lithography." MRS Bulletin 30, no. 12 (December 2005): 976–82. http://dx.doi.org/10.1557/mrs2005.251.

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AbstractThe controlled formation of submicrometer-scale structures in three dimensions is of increasing interest in many applications. Not intended to produce the smallest structures, but instead aimed at complex topographies, two-photon lithography is an intrinsic 3D lithography technique that enables the fabrication of structures difficult to access by conventional single-photon processes with far greater spatial resolution than other 3D microfabrication techniques. By tightly focusing a femtosecond laser beam into a resin, subsequent photo-induced reactions such as polymerization occur only in the close vicinity of the focal point, allowing the fabrication of a 3D structure by directly writing 3D patterns. The current research effort in two-photon lithography is largely devoted to the design and synthesis of high-efficiency photoinitiators and sensitizers, as well as the development of new materials and systems. This article provides an overview of the progress in two-photon processes for the formation of complex images and the development of patterned structures.

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Pisanello, Marco, Di Zheng, Antonio Balena, Filippo Pisano, Massimo De Vittorio, and Ferruccio Pisanello. "An open source three-mirror laser scanning holographic two-photon lithography system." PLOS ONE 17, no. 4 (April 15, 2022): e0265678. http://dx.doi.org/10.1371/journal.pone.0265678.

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Two-photon polymerization is a widely adopted technique for direct fabrication of 3D and 2D structures with sub-diffraction-limit features. Here we present an open-hardware, open-software custom design for a holographic multibeam two-photon polymerization system based on a phase-only spatial light modulator and a three-mirror scanhead. The use of three reflective surfaces, two of which scanning the phase-modulated image along the same axis, allows to overcome the loss of virtual conjugation within the large galvanometric mirrors pair needed to accommodate the holographic projection. This extends the writing field of view among which the hologram can be employed for multi-beam two-photon polymerization by a factor of ~2 on one axis (i.e. from ~200μm to ~400μm), with a voxel size of ~250nm × ~1050nm (lateral × axial size), and writing speed of three simultaneous beams of 2000 voxels/s, making our system a powerful and reliable tool for advanced micro and nano-fabrications on large area.

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Leong, Stephen, Aykut Aksit, Sharon J. Feng, Jeffrey W. Kysar, and Anil K. Lalwani. "Inner Ear Diagnostics and Drug Delivery via Microneedles." Journal of Clinical Medicine 11, no. 18 (September 17, 2022): 5474. http://dx.doi.org/10.3390/jcm11185474.

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Objectives: Precision medicine for inner ear disorders has seen significant advances in recent years. However, unreliable access to the inner ear has impeded diagnostics and therapeutic delivery. The purpose of this review is to describe the development, production, and utility of novel microneedles for intracochlear access. Methods: We summarize the current work on microneedles developed using two-photon polymerization (2PP) lithography for perforation of the round window membrane (RWM). We contextualize our findings with the existing literature in intracochlear diagnostics and delivery. Results: Two-photon polymerization lithography produces microneedles capable of perforating human and guinea pig RWMs without structural or functional damage. Solid microneedles may be used to perforate guinea pig RWMs in vivo with full reconstitution of the membrane in 48–72 h, and hollow microneedles may be used to aspirate perilymph or inject therapeutics into the inner ear. Microneedles produced with two-photon templated electrodeposition (2PTE) have greater strength and biocompatibility and may be used to perforate human RWMs. Conclusions: Microneedles produced with 2PP lithography and 2PTE can safely and reliably perforate the RWM for intracochlear access. This technology is groundbreaking and enabling in the field of inner ear precision medicine.

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Lee, Eung-Sug, Jun-Ho Jeong, Ki-Don Kim, Young-Suk Sim, Dae-Geun Choi, Junhyuk Choi, Sang-Hu Park, et al. "Fabrication of Nano- and Micro-Scale UV Imprint Stamp Using Diamond-Like Carbon Coating Technology." Journal of Nanoscience and Nanotechnology 6, no. 11 (November 1, 2006): 3619–23. http://dx.doi.org/10.1166/jnn.2006.17994.

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Two-dimensional (2-D) and three-dimensional (3-D) diamond-like carbon (DLC) stamps for ultraviolet nanoimprint lithography were fabricated with two methods: namely, a DLC coating process, followed by focused ion beam lithography; and two-photon polymerization patterning, followed by nanoscale-thick DLC coating. We used focused ion beam lithography to fabricate 70 nm deep lines with a width of 100 nm, as well as 70 nm deep lines with a width of 150 nm, on 100 nm thick DLC layers coated on quartz substrates. We also used two-photon polymerization patterning and a DLC coating process to successfully fabricate 200 nm wide lines, as well as 3-D rings with a diameter of 1.35 μm and a height of 1.97 μm, and a 3-D cone with a bottom diameter of 2.88 μm and a height of 1.97 μm. The wafers were successfully printed on an UV-NIL using the DLC stamps without an anti-adhesive layer. The correlation between the dimensions of the stamp's features and the corresponding imprinted features was excellent.

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Li, Zhiquan, Arnulf Rosspeintner, Peng Hu, Guigang Zhu, Yuansheng Hu, Xiang Xiong, Ruwen Peng, Mu Wang, Xiaoya Liu, and Ren Liu. "Silyl-based initiators for two-photon polymerization: from facile synthesis to quantitative structure–activity relationship analysis." Polymer Chemistry 8, no. 43 (2017): 6644–53. http://dx.doi.org/10.1039/c7py01360d.

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Abel, T., R. Dörr, W. Krüger, R. Horstmann, G. Schaumann, M. Roth, and H. F. Schlaak. "Combining two-photon-polymerization with UV-lithography for laser particle acceleration targets." Journal of Physics: Conference Series 1079 (August 2018): 012012. http://dx.doi.org/10.1088/1742-6596/1079/1/012012.

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Dias, Guilherme Osvaldo, Olivier Lecarme, Julien Cordeiro, Emmanuel Picard, and David Peyrade. "Microscale white light emitters fabricated by two-photon polymerization lithography on functional resist." Microelectronic Engineering 257 (March 2022): 111751. http://dx.doi.org/10.1016/j.mee.2022.111751.

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Yuan, Chenyu, Jukun Liu, Tianqing Jia, Kan Zhou, Hongxin Zhang, Jia Pan, Donghai Feng, and Zhenrong Sun. "Super resolution direct laser writing in ITX resist inspired by STED microscopy." Journal of Nonlinear Optical Physics & Materials 23, no. 02 (June 2014): 1450015. http://dx.doi.org/10.1142/s0218863514500155.

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Direct laser writing (DLW) has become a routine tool for fabricating microstructures through two photon polymerization. Due to the diffraction limit, the resolution is usually larger than a quarter of a wavelength. In this article, by using stimulated emission depletion (STED) inspired lithography, we fabricate nanodot of 81 nm in diameter and nanoline of 93 nm in width in resist with initiator of isopropyl thioxanthone (ITX). An 800 nm, 75-MHz fs laser works as the polymerization light and a 532 nm donut mode continuous wave (CW) laser as the depletion light. This technology is potentially useful for fabrication of super resolution nanostructures.

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Ushiba, Shota, Satoru Shoji, Kyoko Masui, Preeya Kuray, Junichiro Kono, and Satoshi Kawata. "3D microfabrication of single-wall carbon nanotube/polymer composites by two-photon polymerization lithography." Carbon 59 (August 2013): 283–88. http://dx.doi.org/10.1016/j.carbon.2013.03.020.

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Дисертації з теми "Two-photon polymerization lithography"

Rajabasadi, Fatemeh, Lukas Schwarz, Mariana Medina-Sánchez, and Oliver G. Schmidt. "3D and 4D lithography of untethered microrobots." Elsevier, 2021. https://slub.qucosa.de/id/qucosa%3A75414.

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In the last decades, additive manufacturing (AM), also called three-dimensional (3D) printing, has advanced micro/nano-fabrication technologies, especially in applications like lightweight engineering, optics, energy, and biomedicine. Among these 3D printing technologies, two-photon polymerization (TPP) offers the highest resolution (even at the nanometric scale), reproducibility and the possibility to create monolithically 3D complex structures with a variety of materials (e.g. organic and inorganic, passive and active). Such active materials change their shape upon an applied stimulus or degrade over time at certain conditions making them dynamic and reconfigurable (also called 4D printing). This is particularly interesting in the field of medical microrobotics as complex functions such as gentle interactions with biological samples, adaptability when moving in small capillaries, controlled cargo-release profiles, and protection of the encapsulated cargoes, are required. Here we review the physics, chemistry and engineering principles of TPP, with some innovations that include the use of micromolding and microfluidics, and explain how this fabrication schemes provide the microrobots with additional features and application opportunities. The possibility to create microrobots using smart materials, nano- and biomaterials, for in situ chemical reactions, biofunctionalization, or imaging is also put into perspective. We categorize the microrobots based on their motility mechanisms, function, and architecture, and finally discuss the future directions of this field of research.

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PIRANI, FEDERICA. "Bio-oriented Micro- and Nano- Structures Based on Stimuli-responsive Polymers." Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2706874.

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Nowadays, the ability to pattern surfaces on the micro- and nano- scale is the basis for a wide range of research fields. Over last few decades, a lot of processing technologies offer the possibility to fabricate complex 2D and 3D polymeric designs which are mostly static in nature since they cannot be physically and chemically modified once fabricated. The aim of the present thesis is to overcome such a limitation, exploiting stimuli-responsive materials (Chapter I). We allow to engineer polymeric architectures adding interesting functionalities, by providing an active manipulation of pre-structured systems, which could be helpfully in a wide variety of applications, such as biosensing and cell conditioning. In the first part of the present dissertation (Chapter II), a thermos-sensitive material is employed. We investigate the thermo-responsive behavior of Poly(N-isopropylacrylamide) (pNIPAAm)-based crosslinkable hydrogel as active binding matrix in optical biosensors. In this study, we propose an extension of surface plasmon resonance (SPR) and optical waveguide mode (OWS) spectroscopy, for in situ observation of nano-patterned hydrogel film that are allowed to swell and collapse by varying the external temperature of the aqueous environment. Weak refractive index contrast of hydrogel structures arranged in periodic pattern, is generally associated with intrinsically low diffraction efficiency. In order to enhance the intensity of diffracted light, the surface is probed by resonantly excited optical waveguide modes, taking advantage of the fact that the hydrogel can serve as optical waveguide (HOW) enabling the excitation of additional modes besides surface plasmons. Thus, we provide a hydrogel optical waveguide-enhanced diffraction measurements, taking advantage of strong electromagnetic field intensity enhancements that amplifies the weak diffracted light intensity. The main part of the thesis is focused in the study of azopolymer-containing materials, a specific class of light-responsive materials. Upon photon absorption, azobenzene undergo reversible trans-cis photoisomerization, which induces a substantial geometrical change of its molecular structure, that can be translated into larger-scale movements of the material below the glass transition temperature (Tg) of the polymer. In Chapter III, by exploiting the light-induced mass migration phenomenon, we demonstrate that an azopolymeric film patterned by soft imprinting technique, can be anisotropically deformed and consequent restored in its initial shape via single irradiation just by controlling the polarization state of the incident laser beam. We also propose that the light-driven morphological manipulation can induce anisotropic wettability changes. Lastly, a polarization driven birefringence effect on flat and structured surfaces is discussed. Chapter IV focuses in the design of novel azopolymeric systems, where the optical response is provided by azobenzene molecules, which doped two different host materials. The photo-responsive behavior and potential applications of azo compounds incorporated into either a soft elastomeric and in rigid matrix is discussed. Azo-embedded poly(dimethylsiloxane) (PDMS) is studied as tunable optical lens and an azo-doped photocurable commercial polymeric resin is developed to study the photo-mechanical transduction of a 3D suspended membrane fabricated by two photon lithography technique. In Chapter V, we propose a light-deformable azopolymeric micro-pillars patterned substrate as a biocompatible and “smart” platform for dynamic material-cell observation in 2D environment, modified by a holographic optical conditioning. The aim is to observe by time-lapse acquisitions, how an in situ deformation of a pre-patterned structure can influence cell functions and fate. Finally, in Chapter VI, general remarks of the present work are discussed, and directions for future perspective are summarized.

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Частини книг з теми "Two-photon polymerization lithography"

Maruo, Shoji. "Microfluidic Devices Produced by Two-Photon-Induced Polymerization." In Multiphoton Lithography, 315–34. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2016. http://dx.doi.org/10.1002/9783527682676.ch12.

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Ober, Christopher K. "Materials systems for 2-photon lithography." In Three-Dimensional Microfabrication Using Two-Photon Polymerization, 143–74. Elsevier, 2020. http://dx.doi.org/10.1016/b978-0-12-817827-0.00053-9.

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Тези доповідей конференцій з теми "Two-photon polymerization lithography"

Leinenbach, F., H. G. Breunig, and K. König. "Mobile laser lithography station for microscopic two-photon polymerization." In SPIE LASE, edited by Stephan Roth, Yoshiki Nakata, Beat Neuenschwander, and Xianfan Xu. SPIE, 2015. http://dx.doi.org/10.1117/12.2078692.

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Zheng, Mei-Ling, Hong Yu, Jie Liu, Yuanyuan Zhao, Feng Jin, and Xianzi Dong. "Biocompatible three-dimensional hydrogel microstructures fabricated by two-photon polymerization." In Subdiffraction-limited Plasmonic Lithography and Innovative Manufacturing Technology, edited by Xuanming Duan, Xiong Li, Xiangang Luo, Xiaoliang Ma, Mingbo Pu, and Rui Zhou. SPIE, 2019. http://dx.doi.org/10.1117/12.2506104.

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Dzikonski, Dustin, Elena Bekker, Riccardo Zamboni, and Cornelia Denz. "Structuring Hydrogels Inside Microfluidic Channels by Two-Photon Lithography." In Novel Optical Materials and Applications. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/noma.2022.noth1e.2.

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We propose and demonstrate a platform for various single cell experiments fabricated by two-photon polymerization inside microfluidic devices. As flexible building blocks, we employ hydrogel-based structures which are added to the initial channel design in-situ.

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Pingali, Rushil, and Sourabh K. Saha. "Reaction-Diffusion Modeling of Photopolymerization During Femtosecond Projection Two-Photon Lithography." In ASME 2021 16th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/msec2021-60255.

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Abstract Two-photon lithography (TPL) is a polymerization-based direct laser writing process that is capable of fabricating arbitrarily complex three-dimensional (3D) structures with submicron features. Traditional TPL techniques have limited scalability due to the slow point-by-point serial writing scheme. The femtosecond projection TPL (FP-TPL) technique increases printing rate by a thousand times by enabling layer-by-layer parallelization. However, parallelization alters the time and the length scales of the underlying polymerization process. It is therefore challenging to apply the models of serial TPL to accurately predict process outcome during FP-TPL. To solve this problem, we have generated a finite element model of the polymerization process on the time and length scales relevant to FP-TPL. The model is based on the reaction-diffusion mechanism that underlies polymerization. We have applied this model to predict the geometry of nanowires printed under a variety of conditions and compared these predictions against empirical data. Our model accurately predicts the nanowire widths. However, accuracy of aspect ratio prediction is hindered by uncertain values of the chemical properties of the photopolymer. Nevertheless, our results demonstrate that the reaction-diffusion model can accurately capture the effect of controllable parameters on FP-TPL process outcome and can therefore be used for process control and optimization.

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Kim, Harnjoo, and Sourabh K. Saha. "Minimizing Shrinkage in Microstructures Printed With Projection Two-Photon Lithography." In ASME 2022 17th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/msec2022-86076.

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Abstract Two-photon lithography (TPL) is a photopolymerization-based additive manufacturing technique capable of fabricating complex 3D structures with submicron features. Projection TPL (P-TPL) is a specific implementation that leverages projection-based parallelization to increase the rate of printing by three orders of magnitude. However, a practical limitation of P-TPL is the high shrinkage of the printed microstructures that is caused by the relatively low degree of polymerization in the as-printed parts. Unlike traditional stereolithography (SLA) methods and conventional TPL, most of the polymerization in P-TPL occurs through dark reactions while the light source is off, thereby resulting in a lower degree of polymerization. In this study, we empirically investigated the parameters of the P-TPL process that affect shrinkage. We observed that the shrinkage reduces with an increase in the duration of laser exposure and with a reduction of layer spacing. To broaden the design space, we explored a photochemical post-processing technique that involves further curing the printed structures using UV light while submerging them in a solution of a photoinitiator. With this post-processing, we were able to reduce the areal shrinkage from more than 45% to 1% without limiting the geometric design space. This shows that P-TPL can achieve high dimensional accuracy while taking advantage of the high throughput when compared to conventional serial TPL. Furthermore, P-TPL has a higher resolution when compared to the conventional SLA prints at a similar shrinkage rate.

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Ushiba, Shota, Satoru Shoji, Preeya Kuray, Kyoko Masui, Junichiro Kono, and Satoshi Kawata. "Two photon polymerization lithography for 3D microfabrication of single wall carbon nanotube/polymer composites." In SPIE MOEMS-MEMS, edited by Georg von Freymann, Winston V. Schoenfeld, and Raymond C. Rumpf. SPIE, 2013. http://dx.doi.org/10.1117/12.2005721.

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Kokareva, Natalia, Alexander Petrov, Vladimir Bessonov, Ksenia Abrashitova, Kirill Safronov, Aleksandr Barannikov, Petr Ershov, et al. "Fabrication of 3D x-ray compound refractive lenses by two-photon polymerization lithography (Conference Presentation)." In 3D Printed Optics and Additive Photonic Manufacturing, edited by Georg von Freymann, Alois M. Herkommer, and Manuel Flury. SPIE, 2018. http://dx.doi.org/10.1117/12.2307371.

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Ushiba, Shota, Satoru Shoji, Kyoko Masui, Junichiro Kono, and Satoshi Kawata. "3D microstructures made of aligned carbon nanotube/polymer composites fabricated by two photon polymerization lithography." In JSAP-OSA Joint Symposia. Washington, D.C.: OSA, 2014. http://dx.doi.org/10.1364/jsap.2014.17p_c3_6.

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Reuter, Danny, Sönke Steenhusen, Christoph Meinecke, Georg Heldt, Matteo Groß, Gerhard Domann, Till Korten, et al. "Approach to combine electron-beam lithography and two-photon polymerization for enhanced nano-channels in network-based biocomputation devices." In 34th European Mask and Lithography Conference, edited by Uwe F. Behringer and Jo Finders. SPIE, 2018. http://dx.doi.org/10.1117/12.2326598.

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Rusyakina, Olga, Tigran Baghdasaryan, Pawel Mergo, Krzysztof Poturaj, Hugo Thienpont, Francis Berghmans, and Thomas Geernaert. "Selective liquid filling of photonic crystal fibers using two-photon polymerization lithography without post-exposure development." In Micro-Structured and Specialty Optical Fibres VI, edited by Christian-Alexander Bunge, Kyriacos Kalli, and Pavel Peterka. SPIE, 2020. http://dx.doi.org/10.1117/12.2557624.

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