A5003848762- Nonlinear Optical Materials Research
- Laser Material Processing Techniques
- Nonlinear Optical Materials Studies
- Photonic and Optical Devices
- Spectroscopy and Quantum Chemical Studies
- Additive Manufacturing and 3D Printing Technologies
- Nanomaterials and Printing Technologies
- Photonic Crystals and Applications
- Molecular spectroscopy and chirality
- Photoacoustic and Ultrasonic Imaging
- Porphyrin and Phthalocyanine Chemistry
- Electrohydrodynamics and Fluid Dynamics
- Laser-induced spectroscopy and plasma
- Optical Imaging and Spectroscopy Techniques
- Luminescence and Fluorescent Materials
- Laser-Ablation Synthesis of Nanoparticles
- Photorefractive and Nonlinear Optics
- Advanced Surface Polishing Techniques
- Solid-state spectroscopy and crystallography
- Laser-Matter Interactions and Applications
- Lipid Membrane Structure and Behavior
- Optical Coatings and Gratings
- Quantum optics and atomic interactions
- Phase-change materials and chalcogenides
- Fern and Epiphyte Biology
Orbotech (United States)
2021-2023
Arotech (Israel)
2009-2020
Soreq Nuclear Research Center
1999-2005
Ben-Gurion University of the Negev
2001
Israel Atomic Energy Commission
1999-2000
Centre National de la Recherche Scientifique
1992
Tel Aviv University
1983-1991
Medicalex (France)
1991
Copper nanoparticle (NP) inks serve as an attractive potential replacement to silver NP in functional printing applications. However their tendency rapidly oxidize has so far limited wider use. In this work we have studied the conditions for laser sintering of Cu-NP ambient while avoiding oxidation. We determined regime stable, low-resistivity copper (< ×3 bulk resistivity value) generation terms irradiance and exposure duration indicated limits on fast processing. The role pre-drying...
Abstract Laser induced forward transfer (LIFT) is employed in a special, high accuracy jetting regime, by adequately matching the sub-nanosecond pulse duration to metal donor layer thickness. Under such conditions, an effective solid nozzle formed, providing stability and directionality femto-liter droplets which are printed from large gap excess of 400 μm. We illustrate wide applicability this method printing several 3D objects. First, very aspect ratio (A/R > 20), micron scale, copper...
3D copper logos printed on epoxy glass laminates are demonstrated. The structures using laser transfer of molten metal microdroplets. example in the image shows letters 50 µm width, with each letter being taller than last, from a height 40 ('s') to 190 ('l'). scanning microscopy is taken at tilt, and topographic was interferometric microscopy, show effective control this technique.
Digital printing of 3D metal micro-structures by laser induced forward transfer under ambient conditions is reviewed. Recent progress has allowed drop on demand molten, femto-liter, droplets with a high jetting directionality. Such small volume solidify instantly, nanosecond time scale, as they touch the substrate. This fast solidification limits their lateral spreading and allows fabrication aspect ratio complex structures. Several examples micron-scale resolution objects printed using this...
Linear and quadratic nonlinear-optical (NLO) properties of a new organic–inorganic crystal, 2-amino-5-nitro-pyridinium-dihydrogen phosphate (2A5NPDP), are reported. 2A5NPDP was designed to display high NLO efficiency by incorporating highly polarizable organic molecules arranged in polar order between polyanion sheets. The material is transparent the visible near-IR (from 0.42 2 μm) with favorable phase-matching (PM) conditions for second-harmonic generation 1-μm region. Crystal nonlinear...
Fast sintering is of importance in additive metallization processes and especially on sensitive substrates. This work explores the mechanisms which set limits to laser rate metal nano-particle inks. A comparison behavior three different ink compositions with exposure times from micro-seconds seconds reveals dominant factor be organic content (OC) ink. With a low OC silver ink, 2% only, time falls below 100 μs resistivity <×4 bulk silver. Still shorter result line delamination deformation...
Many emerging applications in microscale engineering rely on the fabrication of 3D architectures inorganic materials. Small-scale additive manufacturing (AM) aspires to provide flexible and facile access these geometries. Yet, synthesis device-grade materials is still a key challenge toward implementation AM microfabrication. Here, comprehensive overview microstructural mechanical properties metals fabricated by most state-of-the-art methods that offer spatial resolution ≤10 μm presented....
A combination of light and focused ultrasound waves provides a unique way to obtain directly three-dimensional absorption data in turbid medium. We present the an wave which both input output optodes are on same side sample (reflectance geometry). This technique permits local detection depth presence purely absorbing object, without further mathematical processing. It is promising for medical imaging monitoring tissues.
Aluminum metal is of particular interest for use in printed electronics due to its low cost, high conductivity and migration rate electrically driven organic-based devices. However, the reactivity Al particles at nano-scale a major obstacle preparing stable inks from this metal. We describe digital printing aluminum micro-structures by laser-induced forward transfer sub-nanosecond pulse regime. manage jet highly molten micro-droplets with very divergence, less than 2 mrad, 500 nm thin donor...
The frequency dependent hyperpolarizability of typical donor–acceptor organic nonlinear optical molecules is commonly represented by a nonresonant two-level model, first presented Oudar and Chemla. We discuss how this model can be extended into the resonant regime, including cases where molecular transition described an inhomogeneously broadened peak. A measurement electric field induced second harmonic generation (EFISH) demonstrated, as well more conventional off-resonance EFISH....
Electron donor−π−acceptor chromophores 5, 9, 11, 18−20, 21, 22, 27, 28a, 28c, 31, 32, 34−36, 38a−c, 41a, 41c, and 42 have been synthesised. The donor units are 1,3-dithiole ferrocene; conjugated ethylenic, phenyl, phenylenevinylene, thienyl, bithienyl, terthienyl, or thienylenevinylene linkers act as a central π-electron relay unit, dicyanomethylene polynitrofluorene groups the acceptor unit. electronic absorption spectra display broad low-energy intramolecular charge transfer band in...
The droplet velocity and the incubation time of pure aluminum micro-droplets, printed using method sub-nanosecond laser induced forward transfer, have been measured indicating formation supersonic laser-induced jetting. were extracted by measuring a transient electrical signal associated with landing on surface acceptor substrate. This technique has exploited for studying small volume droplets, in range 10–100 femto-litters which velocities measured. results suggest elastic propagation...
We present a study of the morphology and electrical properties copper structures which are printed by laser induced forward transfer from bulk copper. The percentage voids oxidation levels too low to account for high resistivities (~4 14 times resistivity monocrystalline copper) these structures. Transmission electron microscope (TEM) images slices cut areas using focused ion beam (FIB) show nano-sized crystal with grain sizes that smaller than free path length. Scattering such boundaries...
We study 2-(p-N-hexadecyl-N-methylamino)benzylidene-1,3-indandione (1a) as a model compound for the preparation of nonlinear optically (NLO) active Langmuir−Blodgett (LB) layers. The pressure−area (π−A) isotherm at air−water interface is investigated. A limiting area 0.60 ± 0.02 nm2 per molecule found. alternate-layer LB deposition and an inert spacer, cadmium stearate, different surface pressures performed. effects temperature delay time between spreading Langmuir film films are studied. An...
AsSeTe chalcogenide glasses are materials that photosensitive and have a large refractive index. These properties make these particularly suitable for the fabrication of photonic crystals. We present way to build three-dimensional structures from using vapor deposition direct holographic writing. show this technique is intrinsically self-aligned, providing simple layer-by-layer crystals four-layer structure demonstrating principle technique.
Laser-induced forward transfer (LIFT) has been shown to be a useful technique for the manufacturing of micron-scale metal structures. LIFT is high-resolution, non-contact digital printing method that can support fabrication complex shapes and multi-material structures in single step under ambient conditions. However, printed often suffer from inferior mechanical, electrical, thermal properties when compared their bulk counterparts, are prone enhanced chemical corrosion. This due mostly...
Ultrasound modulated light for optical tomography is very useful, since it can provide three-dimensional data with minimal mathematical processing. Although several experimental studies have shown the potential of this method, link between ultrasound location and signal intensity at detector not yet fully understood. We derive an analytical formula relating position transducer detector. also expression signal-to-shot-noise ratio as a function position. show that in certain conditions only...
Abstract In recent years, bulk metallic glasses (BMGs) have drawn much research attention and are shown to be of industrial interest due their superior mechanical properties resistance corrosion. spite the in harnessing MG for microelectromechanical systems devices, there limitations manufacturing such micrometer‐scale structures. A novel approach fabrication 3D structures using laser‐induced forward transfer (LIFT) is demonstrated. Inherent tremendous cooling rates associated with metal...
Both the “after-pulse effect” and dynamic characteristics of photostructural transformations induced in glassy As0.5Se0.5 films by pulsed 532 nm excitation have been studied. The after-pulse effect investigation demonstrated more than a 103 times increase photosensitivity case excitation. Dynamic showed dual time scale behavior different intensity dependence transient long signals. obtained data indicate that strong following short intense light is due to two-photon aids process structural...
Laser induced forward transfer (LIFT) allows for the printing of high resolution metal structures, making it a promising technique manufacturing functional devices. While electrical properties LIFT printed structures have been extensively studies, studies their mechanical properties, which are much interest, rather scarce. Here we explore 3D, aspect ratio, copper and gold structures. The effective modulus special test was determined by tracing resonance frequencies under pulse excitation....
We study the electrical properties of aluminum structures printed by laser forward transfer molten, femtoliter droplets in air. The resulting material is an aluminum/aluminum-oxide nano-composite. By controlling printing conditions, and thereby droplet volume, its jetting velocity duration, it possible to tune resistivity a large extent. depends on degree oxidation which takes place during formation contact points as molten impact substrate. Evidence for these processes provided FIB cross...