The Experts below are selected from a list of 60630 Experts worldwide ranked by ideXlab platform
Alberto Piqué - One of the best experts on this subject based on the ideXlab platform.
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Laser additive manufacturing of embedded electronics
Laser Additive Manufacturing#R##N#Materials Design Technologies and Applications, 2017Co-Authors: Raymond C. Y. Auyeung, N. Charipar, Scott A. Mathews, Alberto PiquéAbstract:Embedding electronics into a substrate offers the next level of performance and miniaturization in microelectronics technology. As components shrink in areal size (<1 mm2) and thickness (<100 μm), their handling and placement by conventional “pick-and-place” machines become more difficult. This chapter discusses the different Laser-based additive processes used to embed electronics components and circuitry into a substrate. These processes are based on Laser-induced forward Transfer, or LIFT, which is an additive form of the more general Laser direct write techniques. A historical survey of the different Laser-assisted processes to Transfer discrete components such as bare dies and surface-mount devices is presented. Then, the ability of LIFT to Transfer functional materials such as metallic interconnects and electrochemically active materials (eg, for microbattery or photovoltaic applications) as direct replacement of discrete elements is discussed. Finally, examples of completed embedded circuits based on Laser Transfer of both discrete elements and interconnects are presented. Laser additive manufacturing is an emerging tool for fabricating embedded structures in next-generation microelectronics.
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Laser forward Transfer using structured light
Optics Express, 2015Co-Authors: Raymond C. Y. Auyeung, Scott A. Mathews, Heungsoo Kim, Alberto PiquéAbstract:A digital micromirror device (DMD) is used to spatially structure a 532 nm Laser beam to print features spatially congruent to the Laser spot in a Laser-induced forward Transfer (LIFT) process known as Laser decal Transfer (LDT). The DMD is a binary (on/off) spatial light modulator and its resolution, half-toning and beam shaping properties are studied using LDT of silver nanopaste layers. Edge-enhanced “checkerboard” beam profiles led to a ~30% decrease in the Laser Transfer fluence threshold (compared to a reference “checkerboard” profile) for a 20-pixel bitmap pattern and its resulting 10-μm square feature.
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Laser Transfer of reconfigurable patterns with a spatial light modulator
Laser-based Micro- and Nanopackaging and Assembly VII, 2013Co-Authors: Alberto Piqué, N. Charipar, Raymond C. Y. Auyeung, Scott A. Mathews, Andrew T. Smith, Heungsoo Kim, Matthew A. KirleisAbstract:Laser forward Transfer of arbitrary and complex configurable structures has recently been demonstrated using a spatial light modulator (SLM). The SLM allows the spatial distribution of the Laser pulse, required by the Laser Transfer process, to be modified for each pulse. The programmable image on the SLM spatially modulates the intensity profile of the Laser beam, which is then used to Transfer a thin layer of material reproducing the same spatial pattern onto a substrate. The combination of Laser direct write (LDW) with a SLM is unique since it enables LDW to operate not only in serial fashion like other direct write techniques but instead reach a level in parallel processing not possible with traditional digital fabrication methods. This paper describes the use of Digital Micromirror Devices or DMDs as SLMs in combination with visible (λ = 532 nm) nanosecond Lasers. The parallel Laser printing of arrayed structures with a single Laser shot is demonstrated together with the full capabilities of SLMs for Laser printing reconfigurable patterns of silver nano-inks Finally, an overview of the unique advantages and capabilities of Laser forward Transfer with SLMs is presented.
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Laser forward Transfer based on a spatial light modulator
Applied Physics A: Materials Science and Processing, 2011Co-Authors: Raymond C. Y. Auyeung, S.a. Mathews, Andrew J. Birnbaum, Alberto PiquéAbstract:We report the first demonstration of Laser forward Transfer using a real-time reconfigurable mask based on a spatial light modulator. The ability to dynamically change the projected beam shape and size of a coherent light source, in this case a 355-nm pulsed UV Laser, represents a significant technological advancement in Laser direct-write processing. The application of Laser Transfer techniques with adaptive control of the Laser beam pattern is unique and rep- resents a paradigm shift in non-lithographic processing. This work describes how the size and shape of an incident Laser beam can be dynamically controlled in real timewith the use of a digital micromirror device (DMD), resulting in Laser- printed functional nanomaterials with geometries identical to those of the projected beam. For applications requiring additive non-lithographic techniques, this novel combina- tion, which relies on the Laser forward Transfer of variable, structured voxels, represents a dramatic improvement in the capabilities and throughput of Laser direct-write processes.
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Laser Transfer Techniques for Digital Microfabrication
Laser Precision Microfabrication, 2010Co-Authors: Alberto PiquéAbstract:Laser Transfer techniques are becoming widely used for digital microfabrication applications. These non-lithographic processes are ideally suited for generating high-resolution patterns of complex materials without negatively affecting their properties. This chapter reviews the fundamentals of the Laser forward Transfer process, describes its evolution fromits origins over 20 years ago, its numerous variations, and presents some of its most successful applications. It concludes discussion on the future of Laser-based digital microfabrication techniques.
Raymond C. Y. Auyeung - One of the best experts on this subject based on the ideXlab platform.
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Laser additive manufacturing of embedded electronics
Laser Additive Manufacturing#R##N#Materials Design Technologies and Applications, 2017Co-Authors: Raymond C. Y. Auyeung, N. Charipar, Scott A. Mathews, Alberto PiquéAbstract:Embedding electronics into a substrate offers the next level of performance and miniaturization in microelectronics technology. As components shrink in areal size (<1 mm2) and thickness (<100 μm), their handling and placement by conventional “pick-and-place” machines become more difficult. This chapter discusses the different Laser-based additive processes used to embed electronics components and circuitry into a substrate. These processes are based on Laser-induced forward Transfer, or LIFT, which is an additive form of the more general Laser direct write techniques. A historical survey of the different Laser-assisted processes to Transfer discrete components such as bare dies and surface-mount devices is presented. Then, the ability of LIFT to Transfer functional materials such as metallic interconnects and electrochemically active materials (eg, for microbattery or photovoltaic applications) as direct replacement of discrete elements is discussed. Finally, examples of completed embedded circuits based on Laser Transfer of both discrete elements and interconnects are presented. Laser additive manufacturing is an emerging tool for fabricating embedded structures in next-generation microelectronics.
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Laser forward Transfer using structured light
Optics Express, 2015Co-Authors: Raymond C. Y. Auyeung, Scott A. Mathews, Heungsoo Kim, Alberto PiquéAbstract:A digital micromirror device (DMD) is used to spatially structure a 532 nm Laser beam to print features spatially congruent to the Laser spot in a Laser-induced forward Transfer (LIFT) process known as Laser decal Transfer (LDT). The DMD is a binary (on/off) spatial light modulator and its resolution, half-toning and beam shaping properties are studied using LDT of silver nanopaste layers. Edge-enhanced “checkerboard” beam profiles led to a ~30% decrease in the Laser Transfer fluence threshold (compared to a reference “checkerboard” profile) for a 20-pixel bitmap pattern and its resulting 10-μm square feature.
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Laser Transfer of reconfigurable patterns with a spatial light modulator
Laser-based Micro- and Nanopackaging and Assembly VII, 2013Co-Authors: Alberto Piqué, N. Charipar, Raymond C. Y. Auyeung, Scott A. Mathews, Andrew T. Smith, Heungsoo Kim, Matthew A. KirleisAbstract:Laser forward Transfer of arbitrary and complex configurable structures has recently been demonstrated using a spatial light modulator (SLM). The SLM allows the spatial distribution of the Laser pulse, required by the Laser Transfer process, to be modified for each pulse. The programmable image on the SLM spatially modulates the intensity profile of the Laser beam, which is then used to Transfer a thin layer of material reproducing the same spatial pattern onto a substrate. The combination of Laser direct write (LDW) with a SLM is unique since it enables LDW to operate not only in serial fashion like other direct write techniques but instead reach a level in parallel processing not possible with traditional digital fabrication methods. This paper describes the use of Digital Micromirror Devices or DMDs as SLMs in combination with visible (λ = 532 nm) nanosecond Lasers. The parallel Laser printing of arrayed structures with a single Laser shot is demonstrated together with the full capabilities of SLMs for Laser printing reconfigurable patterns of silver nano-inks Finally, an overview of the unique advantages and capabilities of Laser forward Transfer with SLMs is presented.
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Laser forward Transfer based on a spatial light modulator
Applied Physics A: Materials Science and Processing, 2011Co-Authors: Raymond C. Y. Auyeung, S.a. Mathews, Andrew J. Birnbaum, Alberto PiquéAbstract:We report the first demonstration of Laser forward Transfer using a real-time reconfigurable mask based on a spatial light modulator. The ability to dynamically change the projected beam shape and size of a coherent light source, in this case a 355-nm pulsed UV Laser, represents a significant technological advancement in Laser direct-write processing. The application of Laser Transfer techniques with adaptive control of the Laser beam pattern is unique and rep- resents a paradigm shift in non-lithographic processing. This work describes how the size and shape of an incident Laser beam can be dynamically controlled in real timewith the use of a digital micromirror device (DMD), resulting in Laser- printed functional nanomaterials with geometries identical to those of the projected beam. For applications requiring additive non-lithographic techniques, this novel combina- tion, which relies on the Laser forward Transfer of variable, structured voxels, represents a dramatic improvement in the capabilities and throughput of Laser direct-write processes.
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Laser-based Digital Microfabrication
2009Co-Authors: Alberto Piqué, Andrew J. Birnbaum, Raymond C. Y. Auyeung, H. Kim, J. Wang, Scott A. MathewsAbstract:Laser Transfer techniques are becoming widely used for digital microfabrication applications. These non-lithographic processes can generate high-resolution patterns of complex materials without negatively affecting their properties for many applications including microelectronics, micro-power sources and MEMS.
Alina Maria Holban - One of the best experts on this subject based on the ideXlab platform.
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maple fabricated fe3o4 cinnamomum verum antimicrobial surfaces for improved gastrostomy tubes
Molecules, 2014Co-Authors: Alina Georgiana Anghel, Alexandra Elena Oprea, Valentina Grumezescu, Alexandru Mihai Grumezescu, Ion Anghel, Florin Iordache, Gabriel Socol, Mariana Chirea, Alina Maria HolbanAbstract:Cinnamomum verum-functionalized Fe3O4 nanoparticles of 9.4 nm in size were Laser Transferred by matrix assisted pulsed Laser evaporation (MAPLE) technique onto gastrostomy tubes (G-tubes) for antibacterial activity evaluation toward Gram positive and Gram negative microbial colonization. X-ray diffraction analysis of the nanoparticle powder showed a polycrystalline magnetite structure, whereas infrared mapping confirmed the integrity of C. verum (CV) functional groups after the Laser Transfer. The specific topography of the deposited films involved a uniform thin coating together with several aggregates of bio-functionalized magnetite particles covering the G-tubes. Cytotoxicity assays showed an increase of the G-tube surface biocompatibility after Fe3O4@CV treatment, allowing a normal development of endothelial cells up to five days of incubation. Microbiological assays on nanoparticle-modified G-tube surfaces have proved an improvement of anti-adherent properties, significantly reducing both Gram negative and Gram positive bacteria colonization.
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MAPLE Fabricated Fe3O4@Cinnamomum verum Antimicrobial Surfaces for Improved Gastrostomy Tubes
Molecules, 2014Co-Authors: Alina Georgiana Anghel, Alexandra Elena Oprea, Valentina Grumezescu, Alexandru Mihai Grumezescu, Ion Anghel, Florin Iordache, Gabriel Socol, Mariana Chirea, Alina Maria HolbanAbstract:Cinnamomum verum-functionalized Fe3O4 nanoparticles of 9.4 nm in size were Laser Transferred by matrix assisted pulsed Laser evaporation (MAPLE) technique onto gastrostomy tubes (G-tubes) for antibacterial activity evaluation toward Gram positive and Gram negative microbial colonization. X-ray diffraction analysis of the nanoparticle powder showed a polycrystalline magnetite structure, whereas infrared mapping confirmed the integrity of C. verum (CV) functional groups after the Laser Transfer. The specific topography of the deposited films involved a uniform thin coating together with several aggregates of bio-functionalized magnetite particles covering the G-tubes. Cytotoxicity assays showed an increase of the G-tube surface biocompatibility after Fe3O4@CV treatment, allowing a normal development of endothelial cells up to five days of incubation. Microbiological assays on nanoparticle-modified G-tube surfaces have proved an improvement of anti-adherent properties, significantly reducing both Gram negative and Gram positive bacteria colonization.
Costas Fotakis - One of the best experts on this subject based on the ideXlab platform.
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Applications of ultrafast Lasers in materials processing: fabrication on self-cleaning surfaces and scaffolds for tissue engineering
15th International School on Quantum Electronics: Laser Physics and Applications, 2008Co-Authors: Costas Fotakis, Vassilia Zorba, Emmanuel Stratakis, M. Barberoglou, E.l. Papadopoulou, Anthi Ranella, Konstantina Terzaki, Maria FarsariAbstract:Materials processing by ultrafast Lasers offers several attractive possibilities for micro/nano fabrication applications. Several exciting prospects arise in the context of surface and bulk Laser induced modifications. These form the basis for diverse applications, including the development and functionalization of Laser engineered surfaces, the Laser Transfer of biomolecules and the functionalization of 3D structures constructed by multiphoton stereolithography. In particular, two examples will be discussed in the following, namely a new approach for the development of superhydrophobic, self cleaning surfaces and the fabrication of functionalized scaffolds, for tissue engineering applications.
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Novel aspects of microprocessing by ultrafast Lasers: From electronic to biological and cultural heritage applications
Pacific International Conference on Applications of Lasers and Optics, 2008Co-Authors: Costas Fotakis, Dimitris G. Papazoglou, Ioanna Zergioti, Maria Farsari, Vassilia Zorba, Emmanuel Stratakis, P. Tzanetakis, George Filippidis, Paraskevi Pouli, Irina-alexandra PaunAbstract:Materials processing by ultrafast Lasers offers several attractive possibilities for micro/nano materials processing. Prospects arising will be discussed in the context of surface and in bulk Laser induced modifications. In particular, examples of diverse applications including the development and functionalization of Laser engineered surfaces, the Laser Transfer of biomolecules and the functionalization of 3D structures constructed by multiphoton stereolithography will be presented. Finally, the removal of molecular substrates by ultrafast Laser ablation will be discussed with emphasis placed on assessing the photochemical changes induced in the remaining bulk material; these are particularly important when it comes to applying Lasers in fine art conservation.Materials processing by ultrafast Lasers offers several attractive possibilities for micro/nano materials processing. Prospects arising will be discussed in the context of surface and in bulk Laser induced modifications. In particular, examples of diverse applications including the development and functionalization of Laser engineered surfaces, the Laser Transfer of biomolecules and the functionalization of 3D structures constructed by multiphoton stereolithography will be presented. Finally, the removal of molecular substrates by ultrafast Laser ablation will be discussed with emphasis placed on assessing the photochemical changes induced in the remaining bulk material; these are particularly important when it comes to applying Lasers in fine art conservation.
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Development of peptide-based patterns by Laser Transfer
Applied Surface Science, 2007Co-Authors: Valentina Dinca, M. Dinescu, A. Popescu, Emmanouil Kasotakis, J. Catherine, Areti Mourka, Anna Mitraki, Maria Farsari, Costas FotakisAbstract:Abstract Peptide-based arrays and patterns have provided a powerful tool in the study of protein recognition and function. A variety of applications have been identified, including the interactions between peptides–enzymes, peptides–proteins, peptides–DNA, peptides–small molecules and peptides–cells. One of the main and most critical unresolved issues is the generation of high-density arrays which maintain the biological function of the peptides. In this study, we employ nanosecond Laser-induced forward Transfer for the generation of high-density peptide arrays and patterns on modified glass surfaces. We show that peptide-based microarrays can be fabricated on solid surfaces and specifically recognized by appropriate fluorescent tags, with the Transfer not affecting the ability of the peptides to form fibrils. These initial results are poised to the construction of larger peptide patterns as scaffolds for the incorporation and display of ligands critical for cell attachment and growth, or for the templating of inorganic materials.
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Time resolved schlieren study of sub-pecosecond and nanosecond Laser Transfer of biomaterials
Applied Surface Science, 2005Co-Authors: Ioanna Zergioti, Costas Fotakis, A. Karaiskou, Dg G. Papazoglou, M. Kapsetaki, Dimitris KafetzopoulosAbstract:A comparative study of the effect of ultrashort (0.5 ps) and short (15 ns) pulses on the Laser forward Transfer of DNA molecules is presented in this paper. We use femtosecond Laser pulses to directly print a wide range of biomaterials, in complicated patterns and structures. The ultrashort Laser pulses reduce the thermal effects, thus allowing the effective deposition of sensitive biomaterials at high spatial resolution for micro-fabricating patterns. This direct Laser printing process enables gentle and spatially selective Transfer of biomaterials and facilitates application possibilities for the fabrication of biosensors and arrays for multi-analyte assays. Here, we present the direct micro-printing of biomaterials such as enzyme patterns by Laser-induced forward Transfer method using 500 fs Laser pulses emitted at 248 nm. Furthermore, the dynamics of the process was investigated by stroboscopic schlieren imaging for time delays up to 3 μs following the Laser irradiation pulse.
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Physical Aspects of Ultra-Fast UV Laser Transfer
Excimer Laser Technology, 1Co-Authors: Dimitris G. Papazoglou, Ioanna Zergioti, Costas FotakisAbstract:Precise patterns with high density and sub-µm spatial resolution are fabricated by Laser-induced Forward Transfer (LIFT). By using ultra-fast UV Laser pulses, the thermal e ects are minimal, the material Transfer is highly directional and there is practically no damage to the Transferred material. This is a non-contact, rapid and simple method applicable to a wide variety of target materials.
Ioanna Zergioti - One of the best experts on this subject based on the ideXlab platform.
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Single Step Laser Transfer and Laser Curing of Ag NanoWires: A Digital Process for the Fabrication of Flexible and Transparent Microelectrodes
Materials (Basel Switzerland), 2018Co-Authors: Filimon Zacharatos, Panagiotis Karvounis, Ioannis Theodorakos, Antonios Hatziapostolou, Ioanna ZergiotiAbstract:Ag nanowire (NW) networks have exquisite optical and electrical properties which make them ideal candidate materials for flexible transparent conductive electrodes. Despite the compatibility of Ag NW networks with Laser processing, few demonstrations of Laser fabricated Ag NW based components currently exist. In this work, we report on a novel single step Laser Transferring and Laser curing process of micrometer sized pixels of Ag NW networks on flexible substrates. This process relies on the selective Laser heating of the Ag NWs induced by the Laser pulse energy and the subsequent localized melting of the polymeric substrate. We demonstrate that a single Laser pulse can induce both Transfer and curing of the Ag NW network. The feasibility of the process is confirmed experimentally and validated by Finite Element Analysis simulations, which indicate that selective heating is carried out within a submicron-sized heat affected zone. The resulting structures can be utilized as fully functional flexible transparent electrodes with figures of merit even higher than 100. Low sheet resistance ( 90%) make the reported process highly desirable for a variety of applications, including selective heating or annealing of nanocomposite materials and Laser processing of nanostructured materials on a large variety of optically transparent substrates, such as Polydimethylsiloxane (PDMS).
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In-situ sequential Laser Transfer and Laser reduction of graphene oxide films
Applied Physics Letters, 2018Co-Authors: S. Papazoglou, Constantinos Petridis, Emmanuel Kymakis, Stella Kennou, Yannis S. Raptis, Stavros Chatzandroulis, Ioanna ZergiotiAbstract:Achieving high quality Transfer of graphene on selected substrates is a priority in device fabrication, especially where drop-on-demand applications are involved. In this work, we report an in-situ, fast, simple, and one step process that resulted in the reduction, Transfer, and fabrication of reduced graphene oxide-based humidity sensors, using picosecond Laser pulses. By tuning the Laser illumination parameters, we managed to implement the sequential printing and reduction of graphene oxide flakes. The overall process lasted only a few seconds compared to a few hours that our group has previously published. DC current measurements, X-Ray Photoelectron Spectroscopy, X-Ray Diffraction, and Raman Spectroscopy were employed in order to assess the efficiency of our approach. To demonstrate the applicability and the potential of the technique, Laser printed reduced graphene oxide humidity sensors with a limit of detection of 1700 ppm are presented. The results demonstrated in this work provide a selective, rapid, and low-cost approach for sequential Transfer and photochemical reduction of graphene oxide micro-patterns onto various substrates for flexible electronics and sensor applications.Achieving high quality Transfer of graphene on selected substrates is a priority in device fabrication, especially where drop-on-demand applications are involved. In this work, we report an in-situ, fast, simple, and one step process that resulted in the reduction, Transfer, and fabrication of reduced graphene oxide-based humidity sensors, using picosecond Laser pulses. By tuning the Laser illumination parameters, we managed to implement the sequential printing and reduction of graphene oxide flakes. The overall process lasted only a few seconds compared to a few hours that our group has previously published. DC current measurements, X-Ray Photoelectron Spectroscopy, X-Ray Diffraction, and Raman Spectroscopy were employed in order to assess the efficiency of our approach. To demonstrate the applicability and the potential of the technique, Laser printed reduced graphene oxide humidity sensors with a limit of detection of 1700 ppm are presented. The results demonstrated in this work provide a selective, ra...
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Laser immobilization of photosynthetic material on screen printed electrodes
CLEO:2011 - Laser Applications to Photonic Applications, 2011Co-Authors: Christos Boutopoulos, Eleftherios Touloupakis, Ittalo Pezzotti, Maria Teresa Giardi, Ioanna ZergiotiAbstract:This work presents the direct Laser printing of thylakoid membranes for the fabrication of photosynthetic-based amperometric biosensors. Laser printing is an excellent tool for direct immobilization of the Transferred photosynthetic material onto non-functionalized electrodes due to the high impact pressure of the Transferred droplets. The use of this Laser Transfer technique enabled complete wetting of the rough electrodes' surface, which could not be achieved with conventional printing/spotting methods. Both immobilization and activity of the photosynthetic material were confirmed by high photocurrent signals combined with a high signal to noise ratio.
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Novel aspects of microprocessing by ultrafast Lasers: From electronic to biological and cultural heritage applications
Pacific International Conference on Applications of Lasers and Optics, 2008Co-Authors: Costas Fotakis, Dimitris G. Papazoglou, Ioanna Zergioti, Maria Farsari, Vassilia Zorba, Emmanuel Stratakis, P. Tzanetakis, George Filippidis, Paraskevi Pouli, Irina-alexandra PaunAbstract:Materials processing by ultrafast Lasers offers several attractive possibilities for micro/nano materials processing. Prospects arising will be discussed in the context of surface and in bulk Laser induced modifications. In particular, examples of diverse applications including the development and functionalization of Laser engineered surfaces, the Laser Transfer of biomolecules and the functionalization of 3D structures constructed by multiphoton stereolithography will be presented. Finally, the removal of molecular substrates by ultrafast Laser ablation will be discussed with emphasis placed on assessing the photochemical changes induced in the remaining bulk material; these are particularly important when it comes to applying Lasers in fine art conservation.Materials processing by ultrafast Lasers offers several attractive possibilities for micro/nano materials processing. Prospects arising will be discussed in the context of surface and in bulk Laser induced modifications. In particular, examples of diverse applications including the development and functionalization of Laser engineered surfaces, the Laser Transfer of biomolecules and the functionalization of 3D structures constructed by multiphoton stereolithography will be presented. Finally, the removal of molecular substrates by ultrafast Laser ablation will be discussed with emphasis placed on assessing the photochemical changes induced in the remaining bulk material; these are particularly important when it comes to applying Lasers in fine art conservation.
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Time resolved schlieren study of sub-pecosecond and nanosecond Laser Transfer of biomaterials
Applied Surface Science, 2005Co-Authors: Ioanna Zergioti, Costas Fotakis, A. Karaiskou, Dg G. Papazoglou, M. Kapsetaki, Dimitris KafetzopoulosAbstract:A comparative study of the effect of ultrashort (0.5 ps) and short (15 ns) pulses on the Laser forward Transfer of DNA molecules is presented in this paper. We use femtosecond Laser pulses to directly print a wide range of biomaterials, in complicated patterns and structures. The ultrashort Laser pulses reduce the thermal effects, thus allowing the effective deposition of sensitive biomaterials at high spatial resolution for micro-fabricating patterns. This direct Laser printing process enables gentle and spatially selective Transfer of biomaterials and facilitates application possibilities for the fabrication of biosensors and arrays for multi-analyte assays. Here, we present the direct micro-printing of biomaterials such as enzyme patterns by Laser-induced forward Transfer method using 500 fs Laser pulses emitted at 248 nm. Furthermore, the dynamics of the process was investigated by stroboscopic schlieren imaging for time delays up to 3 μs following the Laser irradiation pulse.
