keyword
https://read.qxmd.com/read/38535702/synthesis-and-unique-behaviors-of-high-purity-hea-nanoparticles-using-femtosecond-laser-ablation
#1
JOURNAL ARTICLE
David Fieser, Yucheng Lan, Antonino Gulino, Giuseppe Compagnini, Doug Aaron, Matthew Mench, Denzel Bridges, Hugh Shortt, Peter Liaw, Anming Hu
High-entropy alloys (HEAs) are a class of metal alloys consisting of four or more molar equal or near-equal elements. HEA nanomaterials have garnered significant interest due to their wide range of applications, such as electrocatalysis, welding, and brazing. Their unique multi-principle high-entropy effect allows for the tailoring of the alloy composition to facilitate specific electrochemical reactions. This study focuses on the synthesis of high-purity HEA nanoparticles using the method of femtosecond laser ablation synthesis in liquid...
March 21, 2024: Nanomaterials
https://read.qxmd.com/read/38535486/design-fabrication-and-characterization-of-a-high-sensitivity-integrated-quartz-vibrating-beam-accelerometer
#2
JOURNAL ARTICLE
Cun Li, Hong Xue, Yulong Zhao
This paper describes the design, fabrication, and characterization of a quartz vibrating beam accelerometer consisting of a metal spring-mass and quartz double-ended tuning forks (DETFs). In this approach, the inertial force of the proof mass pulls or compresses the DETFs, affecting their resonance frequency and, thus, enabling the quasi-digital measurement of acceleration. An isolation structure was specifically designed to prevent the external interference stress from transforming into the DETFs and to decrease the DETFs' thermal stress as the ambient temperature changes...
March 1, 2024: Review of Scientific Instruments
https://read.qxmd.com/read/38534529/femtosecond-laser-cutting-of-human-crystalline-lens-capsule-and-decellularization-for-corneal-endothelial-bioengineering
#3
JOURNAL ARTICLE
Olfa Ben Moussa, Louise Parveau, Inès Aouimeur, Grégory Egaud, Corantin Maurin, Sofiane Fraine, Sébastien Urbaniak, Chantal Perrache, Zhiguo He, Sedao Xxx, Oliver Dorado Cortez, Sylvain Poinard, Cyril Mauclair, Philippe Gain, Gilles Thuret
The bioengineering of corneal endothelial grafts consists of seeding in vitro cultured corneal endothelial cells onto a thin, transparent, biocompatible, and sufficiently robust carrier which can withstand surgical manipulations. This is one of the most realistic alternatives to donor corneas, which are in chronic global shortage. The anterior capsule of the crystalline lens has already been identified as one of the best possible carriers, but its challenging manual preparation has limited its use. In this study, we describe a femtosecond laser cutting process of the anterior capsule of whole lenses in order to obtain capsule discs of 8 mm diameter, similar to conventional endothelial grafts...
March 5, 2024: Bioengineering
https://read.qxmd.com/read/38528070/supercontinuum-generation-in-bulk-solid-state-material-with-bursts-of-femtosecond-laser-pulses
#4
JOURNAL ARTICLE
B Momgaudis, V Marčiulionytė, V Jukna, G Tamošauskas, M Barkauskas, A Dubietis
We report on experimental and numerical investigation of burst-mode supercontinuum generation in sapphire crystal. The experiments were performed using bursts consisting of two 190 fs, 1030 nm pulses with intra-burst repetition rates of 62.5 MHz and 2.5 GHz from an amplified 1 MHz Yb:KGW laser and revealed higher filamentation and supercontinuum generation threshold for the second pulse in the burst, which increases with the increase of intra-burst repetition rate. The experimental results were quantitatively reproduced numerically, using a developed model, which accounted for altered material response due to residual excitations remaining after propagation of the first pulse...
March 25, 2024: Scientific Reports
https://read.qxmd.com/read/38526989/a-photoswitchable-metallocycle-based-on-azobenzene-synthesis-characterization-and-ultrafast-dynamics
#5
JOURNAL ARTICLE
Raphael I Petrikat, Justin Hornbogen, Marcel J P Schmitt, Emma Resmann, Christina Wiedemann, Nesrin I Dilmen, Heinrich Schneider, Annika M Pick, Christoph Riehn, Rolf Diller, Sabine Becker
The novel photoswitchable ligand 3,3'-Azobenz(metPA)2 (1) is used to prepare a [Cu2(1)2](BF4)2 metallocycle (2), whose photoisomerization was characterized using static and time-resolved spectroscopic methods. Optical studies demonstrate the highly quantitative and reproducible photoinduced cyclic E/Z switching without decay of the complex. Accordingly and best to our knowledge, [Cu2(1)2](BF4)2 constitutes the first reversibly photoswitchable (3d)‑metallocycle based on azobenzene. The photoinduced multiexponential dynamics in the sub-picosecond to few picosecond time domain of 1 and 2 have been assessed...
March 25, 2024: Chemistry: a European Journal
https://read.qxmd.com/read/38526112/spatiotemporal-evolution-of-ultrafast-photocarrier-dynamics-across-ws2-res2-lateral-interface
#6
JOURNAL ARTICLE
Qiannan Cui, Yuanyuan Li, He Zhang, Jianhua Chang, Hua Xu, Chunxiang Xu
2D lateral heterostructures possess atomically sharp lateral interfaces, while understanding of their ultrafast photocarrier dynamics from a spatiotemporal viewpoint is rather elusive. In this study, we have investigated the spatiotemporal evolution of photocarrier dynamics across the 1D lateral interface of a WS2-ReS2 2D lateral heterostructure utilizing femtosecond laser pump-probe. The nontrivial band offset across the 1D lateral interface markedly mediates the spatiotemporal photocarrier transfer and transport processes...
March 28, 2024: Journal of Chemical Physics
https://read.qxmd.com/read/38523342/multipatterned-chondrocytes-scaffolds-by-fl-mopl-with-a-bsa-gma-hydrogel-to-regulate-chondrocytes-morphology
#7
JOURNAL ARTICLE
Teng Li, Jie Liu, Fan-Chun Bin, Qi Duan, Xin-Yi Wu, Xian-Zi Dong, Mei-Ling Zheng
Repairing articular cartilage damage is challenging due to its low regenerative capacity. In vitro, cartilage regeneration is a potential strategy for the functional reconstruction of cartilage defects. A hydrogel is an advanced material for mimicking the extracellular matrix (ECM) due to its hydrophilicity and biocompatibility, which is known as an ideal scaffold for cartilage regeneration. However, chondrocyte culture in vitro tends to dedifferentiate, leading to fibrosis and reduced mechanical properties of the newly formed cartilage tissue...
March 24, 2024: ACS Applied Bio Materials
https://read.qxmd.com/read/38522086/spatial-writing-of-ultrafast-all-optical-switching
#8
JOURNAL ARTICLE
Ziqian Ning, Lan Jiang, Jingya Sun, Yiling Lian, Yongjiu Yuan, Ruiyang Wang, Jiafang Li, Yang Yang
Writing spatial information on ultrafast all-optical switching is essential for constructing ultrafast processing units in photonic applications, such as optical communication and computing networks. However, most methods ignore the fabrication and imaging of controllable switching area, limiting its spatial information and the further design in ultrafast devices. Here, we propose a method to spatially write in ultrafast all-optical switching based on MAPbI3 perovskite with nanocone structure and visualize the switching effect in arbitrary designed area...
March 24, 2024: ACS Nano
https://read.qxmd.com/read/38518502/comparative-study-of-the-impact-of-interpad-nominal-length-on-the-onset-of-the-charge-multiplication-in-standard-segmented-lgad-with-2-p-stops-and-bias-ring-as-isolated-structures
#9
JOURNAL ARTICLE
Gordana Laštovička-Medin, Jovana Doknic, Ivona Bozovic, Gregor Kramberger, Tomáš Laštovička, Jakob Andreasson, Mateusz Rebarz
We present an investigation of the interpad region (IP) in the Ultra-Fast Silicon Detector (UFSD) Type 10, utilizing a femtosecond laser and the transient current technique (TCT). We elucidate the isolation structure and measure the IP distance between pads, comparing it to the nominal value provided by the vendor. A comparison of sensors with identical layouts but different nominal IP distances (49 μm vs. 61 μm) and different processing parameters revealed their significant different charge collection properties in the IP...
March 12, 2024: Applied Radiation and Isotopes
https://read.qxmd.com/read/38518314/femtosecond-collisional-dissipation-of-vibrating-d_-2-in-helium-nanodroplets
#10
JOURNAL ARTICLE
Junjie Qiang, Lianrong Zhou, Yigeng Peng, Chao Yu, Peifen Lu, Shengzhe Pan, Chenxu Lu, Gang Chen, Ruifeng Lu, Wenbin Zhang, Jian Wu
We explored the collision-induced vibrational decoherence of singly ionized D_{2} molecules inside a helium nanodroplet. By using the pump-probe reaction microscopy with few-cycle laser pulses, we captured in real time the collision-induced ultrafast dissipation of vibrational nuclear wave packet dynamics of D_{2}^{+} ion embedded in the droplet. Because of the strong coupling of excited molecular cations with the surrounding solvent, the vibrational coherence of D_{2}^{+} in the droplet interior only lasts for a few vibrational periods and completely collapses within 140 fs...
March 8, 2024: Physical Review Letters
https://read.qxmd.com/read/38516744/laser-synthesized-germanium-nanoparticles-as-biodegradable-material-for-near-infrared-photoacoustic-imaging-and-cancer-phototherapy
#11
JOURNAL ARTICLE
Iaroslav B Belyaev, Ivan V Zelepukin, Polina A Kotelnikova, Gleb V Tikhonowski, Anton A Popov, Alina Yu Kapitannikova, Jugal Barman, Alexey N Kopylov, Daniil N Bratashov, Ekaterina S Prikhozhdenko, Andrei V Kabashin, Sergey M Deyev, Andrei V Zvyagin
Biodegradable nanomaterials can significantly improve the safety profile of nanomedicine. Germanium nanoparticles (Ge NPs) with a safe biodegradation pathway are developed as efficient photothermal converters for biomedical applications. Ge NPs synthesized by femtosecond-laser ablation in liquids rapidly dissolve in physiological-like environment through the oxidation mechanism. The biodegradation of Ge nanoparticles is preserved in tumor cells in vitro and in normal tissues in mice with a half-life as short as 3...
March 22, 2024: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://read.qxmd.com/read/38516169/keratoconus-exploring-fundamentals-and-future-perspectives-a-comprehensive-systematic-review
#12
REVIEW
Sana Niazi, Zisis Gatzioufas, Farideh Doroodgar, Oliver Findl, Alireza Baradaran-Rafii, Jacob Liechty, Majid Moshirfar
BACKGROUND: New developments in artificial intelligence, particularly with promising results in early detection and management of keratoconus, have favorably altered the natural history of the disease over the last few decades. Features of artificial intelligence in different machine such as anterior segment optical coherence tomography, and femtosecond laser technique have improved safety, precision, effectiveness, and predictability of treatment modalities of keratoconus (from contact lenses to keratoplasty techniques)...
2024: Therapeutic Advances in Ophthalmology
https://read.qxmd.com/read/38507205/characterization-of-biological-samples-using-ultra-short-and-ultra-bright-xfel-pulses
#13
JOURNAL ARTICLE
Adam Round, E Jungcheng, Carsten Fortmann-Grote, Klaus Giewekemeyer, Rita Graceffa, Chan Kim, Henry Kirkwood, Grant Mills, Ekaterina Round, Tokushi Sato, Sakura Pascarelli, Adrian Mancuso
The advent of X-ray Free Electron Lasers (XFELs) has ushered in a transformative era in the field of structural biology, materials science, and ultrafast physics. These state-of-the-art facilities generate ultra-bright, femtosecond-long X-ray pulses, allowing researchers to delve into the structure and dynamics of molecular systems with unprecedented temporal and spatial resolutions. The unique properties of XFEL pulses have opened new avenues for scientific exploration that were previously considered unattainable...
2024: Advances in Experimental Medicine and Biology
https://read.qxmd.com/read/38499551/ultrafast-magnetization-enhancement-via-the-dynamic-spin-filter-effect-of-type-ii-weyl-nodes-in-a-kagome-ferromagnet
#14
JOURNAL ARTICLE
Xianyang Lu, Zhiyong Lin, Hanqi Pi, Tan Zhang, Guanqi Li, Yuting Gong, Yu Yan, Xuezhong Ruan, Yao Li, Hui Zhang, Lin Li, Liang He, Jing Wu, Rong Zhang, Hongming Weng, Changgan Zeng, Yongbing Xu
The magnetic type-II Weyl semimetal (MWSM) Co3 Sn2 S2 has recently been found to host a variety of remarkable phenomena including surface Fermi-arcs, giant anomalous Hall effect, and negative flat band magnetism. However, the dynamic magnetic properties remain relatively unexplored. Here, we investigate the ultrafast spin dynamics of Co3 Sn2 S2 crystal using time-resolved magneto-optical Kerr effect and reflectivity spectroscopies. We observe a transient magnetization behavior, consisting of spin-flipping dominated fast demagnetization, slow demagnetization due to overall half-metallic electronic structures, and an unexpected ultrafast magnetization enhancement lasting hundreds of picoseconds upon femtosecond laser excitation...
March 18, 2024: Nature Communications
https://read.qxmd.com/read/38497193/dual-second-harmonic-generation-and-up-conversion-photoluminescence-emission-in-highly-optimized-linbo-3-nanocrystals-doped-and-co-doped-with-er-3-and-yb-3
#15
JOURNAL ARTICLE
K Bredillet, F Riporto, T Guo, A Dhouib, V Multian, V Monnier, P Figueras Llussà, S Beauquis, L Bonacina, Y Mugnier, R Le Dantec
Preparation from the aqueous alkoxide route of doped and co-doped lithium niobate nanocrystals with Er3+ and Yb3+ ions, and detailed investigations of their optical properties are presented in this comprehensive work. Simultaneous emission under femtosecond laser excitation of second harmonic generation (SHG) and up-conversion photoluminescence (UC-PL) is studied from colloidal suspensions according to the lanthanide ion contents. Special attention has been paid to produce phase pure nanocrystals of constant size (∼20 nm) thus allowing a straightforward comparison and optimization of the Er content for increasing the green UC-PL signals under 800 nm excitation...
March 18, 2024: Nanoscale
https://read.qxmd.com/read/38495951/structural-dynamics-at-surfaces-by-ultrafast-reflection-high-energy-electron-diffraction
#16
REVIEW
Michael Horn-von Hoegen
Many fundamental processes of structural changes at surfaces occur on a pico- or femtosecond timescale. In order to study such ultrafast processes, we have combined modern surface science techniques with fs-laser pulses in a pump-probe scheme. Grazing incidence of the electrons ensures surface sensitivity in ultrafast reflection high-energy electron diffraction (URHEED). Utilizing the Debye-Waller effect, we studied the nanoscale heat transport from an ultrathin film through a hetero-interface or the damping of vibrational excitations in monolayer adsorbate systems on the lower ps-timescale...
March 2024: Structural Dynamics (Melville, N.Y.)
https://read.qxmd.com/read/38495052/three-cases-of-non-infectious-necrotizing-stromal-keratitis-after-corneal-refractive-surgery
#17
Hu Chen, Ting Shen, Ling Tong Tan
We reported three cases of aseptic necrotizing stromal keratinitis after corneal refractive surgery (two with small incision lenticule extraction and one with femtosecond laser-laser-assisted insitu keratomileusis). There were three young women who had undergone corneal refractive surgery had white aseptic infiltrating foci along or away from the stroma in both eyes or one eye on regular review, all of whom denied systemic disease or chronic ocular disease. Two patients were diagnosed with aseptic necrotizing corneal stromal inflammation, and one patient was diagnosed with delayed necrotizing corneal stromal inflammation...
March 2024: Journal of Surgical Case Reports
https://read.qxmd.com/read/38489450/optical-structuring-and-finishing-toward-mid-spatial-frequency-error-reduction-using-femtosecond-lasers
#18
JOURNAL ARTICLE
Gong Chen, Jie Qiao
We demonstrate nano-structuring and the reduction of mid-spatial-frequency errors using femtosecond laser figuring and finishing. For the first time, to the best of our knowledge, we have corrected mid-spatial-frequency errors from 17 nm to one nanometer in magnitude. We established a method for creating and predicting periodic nanostructures. This demonstration opens the path of using femtosecond lasers to correct surface errors that inherently result from sub-aperture manufacturing techniques.
March 15, 2024: Optics Letters
https://read.qxmd.com/read/38489446/beam-shaped-femtosecond-laser-printing-of-quasi-capsule-shaped-holographic-terahertz-metasurfaces
#19
JOURNAL ARTICLE
Dan Rao, Jing Qian, Xiaohan Yu, Lequn Liu, Guande Wang, Yiwen Zhou, Teng Zhang, Quanzhong Zhao
Terahertz (THz) metasurfaces have opened up a new avenue for the THz wavefront modulation. However, high-efficient and low-cost fabrication of THz metasurfaces remains a great challenge today. Here, quasi-capsule-shaped polarization-multiplexed holographic THz metasurfaces were printed by a beam-shaped femtosecond laser. The laser beam was spatially modulated by holograms of optimized cylindrical lens loaded on a spatial light modulator (SLM). The size of quasi-capsule apertures can be exquisitely and flexibly controlled by adjusting the focal length in holograms, pulse energy, and pulse number...
March 15, 2024: Optics Letters
https://read.qxmd.com/read/38489411/laser-nanoprocessing-via-an-enhanced-longitudinal-electric-field-of-a-radially-polarized-beam
#20
JOURNAL ARTICLE
Yukine Tsuru, Yuichi Kozawa, Yuuki Uesugi, Shunichi Sato
Single-shot laser ablation is performed on the surface of a transparent glass material using a radially polarized femtosecond beam. Theoretical and experimental investigation revealed the significant role of the material interface under high-numerical-aperture conditions. The longitudinal electric field at the focus was remarkably enhanced due to the total reflection on the interface when a radially polarized beam was focused on the back surface of the glass from the inside using an immersion lens. This focusing condition enabled the fabrication of a small ablation hole sized 67 nm...
March 15, 2024: Optics Letters
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