Tootfinder

Reactive additive capillary stamping with double network hydrogel-derived aerogel stamps under solvothermal conditions
Fatih Alarslan, Martin Frosinn, Kevin Ruwisch, Jannis Thien, Tim Jähnichen, Louisa Eckert, Jonas Klein, Markus Haase, Dirk Enke, Joachim Wollschläger, Uwe Beginn, Martin Steinhart
https://arXiv.org/abs/2401.1501…

Reactive additive capillary stamping with double network hydrogel-derived aerogel stamps under solvothermal conditions
Integration of solvothermal reaction products into complex thin-layer architectures is frequently achieved by combinations of layer transfer and subtractive lithography, whereas direct additive substrate patterning with solvothermal reaction products has remained challenging. We report reactive additive capillary stamping under solvothermal conditions as a parallel contact-lithographic access to patterns of solvothermal reaction products in thin-layer configurations. To this end, corresponding …

Extreme ultraviolet lithography reaches 5 nm resolution
Iason Giannopoulos, Iacopo Mochi, Michaela Vockenhuber, Yasin Ekinci, Dimitrios Kazazis
https://arxiv.org/abs/2402.18234

Extreme ultraviolet lithography reaches 5 nm resolution
Extreme ultraviolet (EUV) lithography is the leading lithography technique in CMOS mass production, moving towards the sub-10 nm half-pitch (HP) regime with the ongoing development of the next generation high-numerical aperture (high-NA) EUV scanners. Hitherto, EUV interference lithography (EUV-IL) utilizing transmission gratings has been a powerful patterning tool for the early development of EUV resists and related processes, playing a key role in exploring and pushing the boundaries of photo…

Uniform large-area surface patterning achieved by metal dewetting for the top-down fabrication of GaN nanowire ensembles
Jingxuan Kang, Rose-Mary Jose, Miriam Oliva, Thomas Auzelle, Mikel G\'omez Ruiz, Abbes Tahraoui, Jonas L\"ahnemann, Oliver Brandt, Lutz Geelhaar
https://arxiv.org/abs/2402.14375

Uniform large-area surface patterning achieved by metal dewetting for the top-down fabrication of GaN nanowire ensembles
The dewetting of thin Pt films on different surfaces is investigated as a means to provide the patterning for the top-down fabrication of GaN nanowire ensembles. The transformation from a thin film to an ensemble of nanoislands upon annealing proceeds in good agreement with the void growth model. With increasing annealing duration, the size and shape uniformity of the nanoislands improves. This improvement speeds up for higher annealing temperature. After an optimum annealing duration, the size…

Altered patterning of neural activity in a tauopathy mouse model
C. Hoffman, J. Cheng, R. Morales, D. Ji, Y. Dabaghian
https://arxiv.org/abs/2403.15926 htt…

Altered patterning of neural activity in a tauopathy mouse model
Alzheimer's disease (AD) is a complex neurodegenerative condition that manifests at multiple levels and involves a spectrum of abnormalities ranging from the cellular to cognitive. Here, we investigate the impact of AD-related tau-pathology on hippocampal circuits in mice engaged in spatial navigation, and study changes of neuronal firing and dynamics of extracellular fields. While most studies are based on analyzing instantaneous or time-averaged characteristics of neuronal activity, we focus …

Experimental identification of force, velocity, and nematic order relationships in active nematic cell monolayers
Masahito Uwamichi, He Li, Zihui Zhao, Yisong Yao, Hideo Higuchi, Kyogo Kawaguchi, Masaki Sano
https://arxiv.org/abs/2402.16151

Experimental identification of force, velocity, and nematic order relationships in active nematic cell monolayers
Cell alignment often forms nematic order, which can lead to anomalous collective cell flow due to the so-called active force. Although it is appreciated that cell migration is driven by traction force, a quantitative evaluation of the relationships between the traction force, the nematic patterning, and the cell flow velocity is still elusive. Here we have found that cellular traction force aligns almost perfectly and is proportional in amplitude to the gradient of the nematic order tensor, not…

Reactive additive capillary stamping with double network hydrogel-derived aerogel stamps under solvothermal conditions
Fatih Alarslan, Martin Frosinn, Kevin Ruwisch, Jannis Thien, Tim Jähnichen, Louisa Eckert, Jonas Klein, Markus Haase, Dirk Enke, Joachim Wollschläger, Uwe Beginn, Martin Steinhart
https://arXiv.org/abs/2401.1501…

Reactive additive capillary stamping with double network hydrogel-derived aerogel stamps under solvothermal conditions
Integration of solvothermal reaction products into complex thin-layer architectures is frequently achieved by combinations of layer transfer and subtractive lithography, whereas direct additive substrate patterning with solvothermal reaction products has remained challenging. We report reactive additive capillary stamping under solvothermal conditions as a parallel contact-lithographic access to patterns of solvothermal reaction products in thin-layer configurations. To this end, corresponding …

Altered patterning of neural activity in a tauopathy mouse model
C. Hoffman, J. Cheng, R. Morales, D. Ji, Y. Dabaghian
https://arxiv.org/abs/2403.15926 htt…

Altered patterning of neural activity in a tauopathy mouse model
Alzheimer's disease (AD) is a complex neurodegenerative condition that manifests at multiple levels and involves a spectrum of abnormalities ranging from the cellular to cognitive. Here, we investigate the impact of AD-related tau-pathology on hippocampal circuits in mice engaged in spatial navigation, and study changes of neuronal firing and dynamics of extracellular fields. While most studies are based on analyzing instantaneous or time-averaged characteristics of neuronal activity, we focus …

Bending Energy-Driven Cooperative Patterning of 2D Colloids in Elastic 2D Fluids
Weiyue XinDepartment of Chemical Engineering, University of Massachusetts, Maria M. SantoreDepartment of Polymer Science and Engineering, University of Massachusetts
https://arxiv.org/abs/2402.15068

Bending Energy-Driven Cooperative Patterning of 2D Colloids in Elastic 2D Fluids
Suspensions of colloidal microplates in contoured 2D elastic fluids sheets are dominated by the bending mechanics and shear rigidity of the plates and the contrasting in-plane shear flow of the 2D fluid. Using the phase separated phospholipid membranes of individual giant unilamellar vesicles as models of contoured 2D suspensions, where solid domains act as colloids in a fluid membrane, we explore bending elasticity-driven assembly. The plate-shaped domains are varied between 1-10 μm in diamet…

This https://arxiv.org/abs/2310.10217 has been replaced.
initial toot: https://mastoxiv.page/@ar…

Slender Phoretic Loops and Knots
We present an asymptotic theory for solving the dynamics of slender autophoretic loops and knots. Our formulation is valid for non-intersecting 3D centrelines, with arbitrary chemical patterning and varying (circular) cross-sectional radius, allowing a broad class of slender active loops and knots to be studied. The theory is amenable to closed-form solutions in simpler cases, allowing us to analytically derive the swimming speed of chemically patterned tori, and the pumping strength (stresslet…

Wave-driven phase wave patterns in a ring of FitzHugh-Nagumo oscillators
Daniel Cebri\'an-Lacasa, Marcin Leda, Andrew B. Goryachev, Lendert Gelens
https://arxiv.org/abs/2404.13363

Wave-driven phase wave patterns in a ring of FitzHugh-Nagumo oscillators
We explore a biomimetic model that simulates a cell, with the internal cytoplasm represented by a two-dimensional circular domain and the external cortex by a surrounding ring, both modeled using FitzHugh-Nagumo systems. The external ring is dynamically influenced by a pacemaker-driven wave originating from the internal domain, leading to the emergence of three distinct dynamical states based on the varying strengths of coupling. The range of dynamics observed includes phase patterning, the pro…

Bessel-beam direct-write of the etch-mask in a nano-film of alumina for high-efficiency Si solar cells
Tomas Katkus, Soon Hock Ng, Haoran Mu, Nguyen Hoai An Le, Dominyka Stonyte, Zahra Khajehsaeidimahabadi, Gediminas Seniutinas, Justas Baltrukonis, Orestas Ulcinas, Mindaugas Mikutis, Vytautas Sabonis, Yoshiaki Nishijima, Michael Rienacker, Jan Krugener, Robby Peibst, Sajeev John, Saulius Juodkazis

Bessel-beam direct-write of the etch-mask in a nano-film of alumina for high-efficiency Si solar cells
Large surface area applications such as high-efficiency > 26% solar cells require surface patterning with 1-10 micrometers periodic patterns at high fidelity over 1-10 cm^2 areas (before up scaling to 1 m^2) to perform at, or exceed, the Lambertian (ray optics) limit of light trapping. Here we show a pathway to high-resolution sub-1 micrometer etch mask patterning by ablation using direct femtosecond laser writing performed at room conditions (without the need for a vacuum-based lithography app…

Geometrically-Controlled Microscale Patterning and Epitaxial Lateral Overgrowth of Nitrogen-Polar GaN
Pietro Pampili, Vitaly Z. Zubialevich, Peter J. Parbrook
https://arxiv.org/abs/2402.09385

Geometrically-Controlled Microscale Patterning and Epitaxial Lateral Overgrowth of Nitrogen-Polar GaN
In this study we report on a novel two-step epitaxial growth technique that enables a significant improvement of the crystal quality of nitrogen-polar GaN. The starting material is grown on 4° vicinal sapphire substrates by metal organic vapour phase epitaxy, with an initial high-temperature sapphire nitridation to control polarity. The material is then converted into a regular array of hexagonal pyramids by wet-etch in a KOH solution, and subsequently regrown to coalesce the pyramids back int…

Laser patterning of magnonic structure via local crystallization of Yittrium Iron Garnet
A. Del Giacco, F. Maspero, V. Levati, M. Vitali, E. Albisetti, D. Petti, L. Brambilla, V. Polewczyk, G. Vinai, G. Panaccione, R. Silvani, M. Madami, S. Tacchi, R. Dreyer, S. R. Lake, G. Woltersdorf, G. Schmidt, Riccardo Bertacco
https://arxi…

Laser patterning of magnonic structure via local crystallization of Yittrium Iron Garnet
The fabrication and integration of high-quality structures of Yttrium Iron Garnet (YIG) is critical for magnonics.Films with excellent properties are obtained only on single crystal Gadolinium Gallium Garnet (GGG) substrates using high-temperature processes. The subsequent realization of magnonic structures via lithography and etching is not straightforward as it requires a tight control of the edge roughness, to avoid magnon scattering, and planarization in case of multilayer devices. In this …

Characterization of pixel crosstalk and impact of Bayer patterning by quantum efficiency measurement
J\'er\^ome Vaillant (CEA-LETI, UGA), Cl\'emence Mornet (CEA-LETI, UGA), Thomas Decroux (ST-CROLLES), Didier H\'erault (ST-CROLLES), Isabelle Schanen (UGA)
https://arxiv.org/abs/2403.13404

Characterization of pixel crosstalk and impact of Bayer patterning by quantum efficiency measurement
Development of small pixels for high resolution image sensors implies a lot of challenges. A high level of performance should be guaranteed whereas the overall size must be reduced and so the degree of freedom in design and process. One key parameter of this constant improvement is the knowledge and the control of the crosstalk between pixels. In this paper, we present an advance in crosstalk characterization method based on the design of specific color patterns and the measurement of quantum e…

This https://arxiv.org/abs/2206.03552 has been replaced.
link: https://scholar.google.com/scholar?q=a

Faceted wrinkling by contracting a curved boundary
Single-mode deformations of two-dimensional materials, such as the Miura-ori zig-zag fold, are important to the design of deployable structures because of their robustness; these usually require careful pre-patterning of the material. Here we show that inward contraction of a curved boundary produces a fine wrinkle pattern with a novel structure that suggests similar single-mode characteristics, but with minimal pre-patterning. Using finite-element representation of the contraction of a thin ci…

On the speed of propagation in Turing patterns for reaction-diffusion systems
V\'aclav Klika, Eamonn A. Gaffney, Philip K. Maini
https://arxiv.org/abs/2403.09247

On the speed of propagation in Turing patterns for reaction-diffusion systems
This study investigates transient wave dynamics in Turing pattern formation, focusing on waves emerging from localised disturbances. While the traditional focus of diffusion-driven instability has primarily centred on stationary solutions, considerable attention has also been directed towards understanding spatio-temporal behaviours, particularly the propagation of patterning from localised disturbances. We analyse these waves of patterning using both the well-established marginal stability cri…

This https://arxiv.org/abs/2303.04111 has been replaced.
initial toot: https://mastoxiv.page/@arX…

Smart patterning for topological pumping of elastic surface waves
Topological pumping supplies a robust mechanism to steer waves across a sample without being affected by disorders and defects. For the first time, we demonstrate the pumping of elastic surface waves, achieved by a smart patterning of a surface that creates a synthetic dimension, which is explored by the wave as it is launched perpendicularly to the steering direction. Specifically, we design and fabricate an elastic medium decorated with arrays of pillar-type resonators whose eigenmodes are lo…

Direct Exfoliation of Nanoribbons from Bulk van der Waals Crystals
Ashley P. Saunders, Victoria Chen, Jierong Wang, Amalya C. Johnson, Amy S. McKeown-Green, Helen J. Zeng, T. Kien Mac, Tuan Trinh, Tony F. Heinz, Eric Pop, Fang Liu
https://arxiv.org/abs/2402.11392

Direct Exfoliation of Nanoribbons from Bulk van der Waals Crystals
Confinement of monolayers into quasi-one-dimensional atomically-thin nanoribbons could lead to novel quantum phenomena beyond those achieved in their bulk and monolayer counterparts. However, current experimental availability of nanoribbon species beyond graphene has been limited to bottom-up synthesis or top-down patterning. In this study, we introduce a versatile and direct lithography-free approach to exfoliate a variety of bulk van der Waals (vdW) crystals into nanoribbons. Akin to the Scot…

Self-consistent sharp interface theory of active condensate dynamics
Andriy Goychuk, Leonardo Demarchi, Ivan Maryshev, Erwin Frey
https://arXiv.org/abs/2401.17111

Self-consistent sharp interface theory of active condensate dynamics
Biomolecular condensates help organize the cell cytoplasm and nucleoplasm into spatial compartments with different chemical compositions. A key feature of such compositional patterning is the local enrichment of enzymatically active biomolecules which, after transient binding via molecular interactions, catalyze reactions among their substrates. Thereby, biomolecular condensates provide a spatial template for non-uniform concentration profiles of substrates. In turn, the concentration profiles …

This https://arxiv.org/abs/2401.16695 has been replaced.
initial toot: https://mastoxiv.page/@ar…

Focusing membrane metamirrors for integrated cavity optomechanics
We have realized a suspended, high-reflectivity focusing metamirror ($f\approx 10$ cm, $\mathcal{R} \approx 99\%$) by non-periodic photonic crystal patterning of a Si$_3$N$_4$ membrane. The design enables construction of a stable, short ($L$ = 30 $μ$m), high-finesse ($\mathcal{F}>600$) membrane cavity optomechanical system using a single plano dielectric end-mirror. We present the metamirror design, fabrication process, and characterization of its reflectivity using both free space and cavity-…

This https://arxiv.org/abs/2312.00653 has been replaced.
initial toot: https://mastoxiv.page/@a…

Area Selective Chemical Vapor Deposition of Gold by Electron Beam Seeding
Chemical vapour deposition (CVD) is an established method for producing high-purity thin films, but it typically necessitates the pre- and post-processing of a mask to produce structures. This paper presents a novel maskless patterning technique that enables area selective CVD of gold. A focused electron beam is used to decompose the metal-organic precursor Au(acac)Me$_2$ locally, thereby creating an autocatalytically active seed layer for subsequent CVD with the same precursor. The procedure c…

This https://arxiv.org/abs/2401.16794 has been replaced.
initial toot: https://mastoxiv.page/@arXi…

Simulation aspects of patterning polymer films via evaporative lithography and composite substrates
The continuing development of evaporative lithography is important for many areas such as the creation of photonic crystals for optronics and microelectronics, the development of biosensors for medical applications and biotechnology, and for the formation of functional coatings for nanotechnology, including the application of thin, protective polymer coatings. The article proposes a mathematical model that allows us to explain the basic mechanisms of the formation of thin polymer films (less th…

Structural colors with embedded anti-counterfeit features fabricated by laser-based methods
Sascha Teutoburg-Weiss, Marcos Soldera, Felix Bouchard, Joshua Kre{\ss}, Yana Vaynzof, Andr\'es Fabi\'an Lasagni
https://arxiv.org/abs/2404.11254

Structural colors with embedded anti-counterfeit features fabricated by laser-based methods
Structural colors can be induced on metals not only to fabricate logos or decorative motives but also to embed anti-counterfeit features for product protection. In this study, stainless steel (EN 1.4301) plates are colorized by growing a thin oxide layer using direct laser writing (DLW) and hidden anti-counterfeit measures are included on their surfaces by direct laser interference patterning (DLIP) processing. The periodic microstructures resulting from the DLIP treatment have a spatial period…

Roll-to-roll tomographic volumetric additive manufacturing for continuous production of microstructures on long flexible substrates
Joseph Toombs, Chi Chung Li, Hayden Taylor
https://arxiv.org/abs/2402.10955

Roll-to-roll tomographic volumetric additive manufacturing for continuous production of microstructures on long flexible substrates
Tomographic volumetric additive manufacturing (VAM) has proven viable to 3D-print diverse materials including polymer, glass, ceramic, and hydrogel at the centimeter scale. As tomographic VAM is extended to the microscale, many of its advantages are translatable, including smooth layer-less surfaces, support-free and shear force-free printing, material flexibility, and speed of production. However, as we shrink the patterning scale, the depth of field shrinks much more rapidly and does so rough…

Lock-Key Microfluidics: Simulating Nematic Colloid Advection along Wavy-Walled Channels
Karolina Wamsler, Louise C. Head, Tyler N. Shendruk
https://arxiv.org/abs/2404.07367

Lock-Key Microfluidics: Simulating Nematic Colloid Advection along Wavy-Walled Channels
Liquid crystalline media mediate interactions between suspended particles and confining geometries, which not only has potential to guide patterning and bottom-up colloidal assembly, but can also control colloidal migration in microfluidic devices. However, simulating such dynamics is challenging because nemato-elasticity, diffusivity and hydrodynamic interactions must all be accounted for within complex boundaries. We model the advection of colloids dispersed in flowing and fluctuating nematic…

This https://arxiv.org/abs/2312.09568 has been replaced.
initial toot: https://mastoxiv.page/@ar…

Advancing large-scale thin-film PPLN nonlinear photonics with segmented tunable micro-heaters
Thin-film periodically poled lithium niobate (TF-PPLN) devices have recently gained prominence for efficient wavelength conversion processes in both classical and quantum applications. However, the patterning and poling of TF-PPLN devices today are mostly performed at chip scales, presenting a significant bottleneck for future large-scale nonlinear photonic systems that require the integration of multiple nonlinear components with consistent performance and low cost. Here, we take a pivotal ste…

Tailoring the Nucleation and Growth of Silver Nanoparticles by Sputtering Deposition under Acoustic Wave Activation. Assessment of Plasma Conditions and 2D Patterning Phenomena
Helene Reichel, Aurelio Garcia-Valenzuela, Jose Andres Espino-Roman, Jorge Gil-Rostra, Guillermo Fernando Regodon, Victor Rico-Gavira, Ana Borras, Ana Gomez-Ramirez, Alberto Palmero, Agustin R. Gonzalez-Elipe, Manuel Oliva-Ramirez

Tailoring the Nucleation and Growth of Silver Nanoparticles by Sputtering Deposition under Acoustic Wave Activation. Assessment of Plasma Conditions and 2D Patterning Phenomena
Early results on the plasma deposition of dielectric thin films on acoustic wave (AW) activated substrates revealed a densification pattern arisen from the focusing of plasma ions and their impact on specific areas of the piezoelectric substrate. Herein, we extend this methodology to tailor the plasma deposition of metals onto AW-activated LiNbO3 piezoelectric substrates. Our investigation reveals the tracking of the initial stages of nanoparticle (NP) formation and growth during the submonolay…

Nanomolecular OLED Pixelization Enabling Electroluminescent Metasurfaces
Tommaso Marcato, Jiwoo Oh, Zhan-Hong Lin, Sunil B. Shivarudraiah, Sudhir Kumar, Shuangshuang Zeng, Chih-Jen Shih
https://arxiv.org/abs/2404.05336

Nanomolecular OLED Pixelization Enabling Electroluminescent Metasurfaces
Miniaturization of light-emitting diodes (LEDs) can enable high-resolution augmented and virtual reality displays and on-chip light sources for ultra-broadband chiplet communication. However, unlike silicon scaling in electronic integrated circuits, patterning of inorganic III-V semiconductors in LEDs considerably compromises device efficiencies at submicrometer scales. Here, we present the scalable fabrication of nanoscale organic LEDs (nano-OLEDs), with the highest array density (>84,000 pixe…

A suspended focusing Si$_3$N$_4$ metamirror for integrated cavity optomechanics
A. R. Agrawal, J. Manley, D. Allepuz-Requena, D. J. Wilson
https://arXiv.org/abs/2401.16695

A suspended focusing Si$_3$N$_4$ metamirror for integrated cavity optomechanics
We have realized a suspended, high-reflectivity focusing metamirror ($f\approx 10$ cm, $\mathcal{R} \approx 99\%$) by non-periodic photonic crystal patterning of a Si$_3$N$_4$ membrane. The design enables construction of a stable, short ($L$ = 30 $μ$m), high-finesse ($\mathcal{F}>600$) membrane cavity optomechanical system using a single plano dielectric end-mirror. We present the metamirror design, fabrication process, and characterization of its reflectivity using both free space and cavity-…