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https://www.readbyqxmd.com/read/29144753/nonlinear-metasurface-for-simultaneous-control-of-spin-and-orbital-angular-momentum-in-second-harmonic-generation
#1
Guixin Li, Lin Wu, King Fai Li, Shumei Chen, Christian Schlickriede, Zhengji Xu, Siya Huang, Wen-Di Li, Yan Jun Liu, Edwin Yue-Bun Pun, Thomas Zentgraf, Kok Wai Cheah, Yu Luo, Shuang Zhang
The spin and orbital angular momentum (SAM and OAM) of light is providing a new gateway towards high capacity and robust optical communications. While the generation of light with angular momentum is well studied in linear optics, its further integration into nonlinear optical devices will open new avenues for increasing the capacity of optical communications through additional information channels at new frequencies. However, it has been challenging to manipulate the both SAM and OAM of nonlinear signals in harmonic generation processes with conventional nonlinear materials...
November 16, 2017: Nano Letters
https://www.readbyqxmd.com/read/29144310/preparation-of-ureido-functionalized-pva-silica-mesoporous-fibre-membranes-via-electrospinning-for-adsorption-of-pb-2-and-cu-2-in-wastewater
#2
Meimei Zhou, Weizhen Tang, Pingping Luo, Jiqiang Lyu, Aixia Chen, Longkai Qiao, Daniel Nover
Ureido-functionalized mesoporous polyvinyl alcohol/silica composite nanofibre membranes were prepared by electrospinning technology and their application for removal of Pb(2+) and Cu(2+) from wastewater was discussed. The characteristics of the membranes were investigated by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and N2 adsorption-desorption analysis. Results show that the membranes have long fibrous shapes and worm-like mesoporous micromorphologies. Fourier transform infrared spectroscopy confirmed the membranes were successfully functionalized with ureido groups...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144298/flood-forecasting-within-urban-drainage-systems-using-narx-neural-network
#3
Yves Abou Rjeily, Oras Abbas, Marwan Sadek, Isam Shahrour, Fadi Hage Chehade
Urbanization activity and climate change increase the runoff volumes, and consequently the surcharge of the urban drainage systems (UDS). In addition, age and structural failures of these utilities limit their capacities, and thus generate hydraulic operation shortages, leading to flooding events. The large increase in floods within urban areas requires rapid actions from the UDS operators. The proactivity in taking the appropriate actions is a key element in applying efficient management and flood mitigation...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29143828/large-stretchability-and-failure-mechanism-of-graphene-kirigami-under-tension
#4
Zhujiang Hua, Yang Zhao, Shuhong Dong, Peishi Yu, Yu Liu, Ning Wei, Junhua Zhao
From the macro- to the nanoscale, kirigami structures show novel and tunable properties by tailoring the original two-dimensional sheets. In this study, the large stretchability and failure behavior in graphene nanoribbon kirigami (GNR-k) are obtained using the finite element (FE) method and molecular dynamics (MD) simulations. The carbon-carbon bond in the FE method is equivalent to a nonlinear Timoshenko beam based on the Tersoff-Brenner potential. All the results from the present FE method are in reasonable agreement with those from our MD simulations using the REBO potential...
November 16, 2017: Soft Matter
https://www.readbyqxmd.com/read/29143038/optical-nonlinearity-engineering-of-a-bismuth-telluride-saturable-absorber-and-application-of-a-pulsed-solid-state-laser-therein
#5
Yi-Ran Wang, Peng Lee, Bai-Tao Zhang, Yuan-Hua Sang, Jing-Liang He, Hong Liu, Chao-Kuei Lee
Saturable absorbers (SAs) have interesting applications for the realization of pulsed lasers in various wavelengths of fiber and solid-state lasers. Topological insulators (TIs) have been recently discovered to feature saturable absorption due to their unique band structure. In this study, high-purity layers of Bi2Te3 thin film SA have been successfully prepared using the spin coating-coreduction approach (SCCA). Compared with the typical method of preparing SAs, the SCCA can be used to prepare topological insulator saturable absorbers (TISAs) with high optical quality, large area consistency, and controllable thickness, which is critical for pulsed lasers...
November 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/29143024/an-analysis-of-the-explosion-limits-of-hydrogen-oxygen-mixtures-with-nonlinear-chain-reactions
#6
Wenkai Liang, Chung K Law
The ignition boundary of hydrogen/oxygen mixtures is a Z-shaped curve in the pressure-temperature space, demonstrating the existence of three explosion limits. In this study, a general analysis governing all the three explosion limits in an isothermal environment is performed by considering both linear chain reactions (reactant-radical reactions) and nonlinear chain reactions (radical-radical reactions), in addition to the zeroth-order reactant-reactant reactions. For the nonlinear reactions, it is further shown that the linear-nonlinear coupling has the major influence, while the effect of nonlinear-nonlinear coupling is negligible...
November 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29143000/parametric-amplification-in-mos2-drum-resonator
#7
Parmeshwar Prasad, Nishta Arora, A K Naik
Parametric amplification is widely used in diverse areas from optics to electronic circuits to enhance low level signals by varying relevant system parameters. Parametric amplification has also been performed in several micro-nano resonators including nano-electromechanical system (NEMS) resonators based on a two-dimensional (2D) material. Here, we report the enhancement of mechanical response in a MoS2 drum resonator using degenerate parametric amplification. We use parametric pumping to modulate the spring constant of the MoS2 resonator and achieve a 10 dB amplitude gain...
November 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/29142619/the-formation-of-extragraft-bone-bridging-after-anterior-cervical-discectomy-and-fusion-a-finite-element-analysis
#8
Shin Won Kwon, Chi Heon Kim, Chun Kee Chung, Tae Hyun Park, Su Heon Woo, Sung-Jae Lee, Seung Heon Yang
Objective: In addition to bone bridging inside a cage or graft (intragraft bone bridging, InGBB), extragraft bone bridging (ExGBB) is commonly observed after anterior cervical discectomy and fusion (ACDF) with a stand-alone cage. However, solid bony fusion without the formation of ExGBB might be a desirable condition. We hypothesized that an insufficient contact area for InGBB might be a causative factor for ExGBB. The objective was to determine the minimal area of InGBB by finite element analysis...
November 2017: Journal of Korean Neurosurgical Society
https://www.readbyqxmd.com/read/29142276/detecting-the-relevance-to-performance-of-whole-body-movements
#9
Daisuke Furuki, Ken Takiyama
Goal-directed whole-body movements are fundamental in our daily life, sports, music, art, and other activities. Goal-directed movements have been intensively investigated by focusing on simplified movements (e.g., arm-reaching movements or eye movements); however, the nature of goal-directed whole-body movements has not been sufficiently investigated because of the high-dimensional nonlinear dynamics and redundancy inherent in whole-body motion. One open question is how to overcome high-dimensional nonlinear dynamics and redundancy to achieve the desired performance...
November 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29142262/observation-of-replica-symmetry-breaking-in-disordered-nonlinear-wave-propagation
#10
Davide Pierangeli, Andrea Tavani, Fabrizio Di Mei, Aharon J Agranat, Claudio Conti, Eugenio DelRe
A landmark of statistical mechanics, spin-glass theory describes critical phenomena in disordered systems that range from condensed matter to biophysics and social dynamics. The most fascinating concept is the breaking of replica symmetry: identical copies of the randomly interacting system that manifest completely different dynamics. Replica symmetry breaking has been predicted in nonlinear wave propagation, including Bose-Einstein condensates and optics, but it has never been observed. Here, we report the experimental evidence of replica symmetry breaking in optical wave propagation, a phenomenon that emerges from the interplay of disorder and nonlinearity...
November 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/29142017/modelling-the-effects-of-phylogeny-and-body-size-on-within-host-pathogen-replication-and-immune-response
#11
Soumya Banerjee, Alan S Perelson, Melanie Moses
Understanding how quickly pathogens replicate and how quickly the immune system responds is important for predicting the epidemic spread of emerging pathogens. Host body size, through its correlation with metabolic rates, is theoretically predicted to impact pathogen replication rates and immune system response rates. Here, we use mathematical models of viral time courses from multiple species of birds infected by a generalist pathogen (West Nile Virus; WNV) to test more thoroughly how disease progression and immune response depend on mass and host phylogeny...
November 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/29141965/food-groups-and-risk-of-hypertension-a-systematic-review-and-dose-response-meta-analysis-of-prospective-studies
#12
REVIEW
Lukas Schwingshackl, Carolina Schwedhelm, Georg Hoffmann, Sven Knüppel, Khalid Iqbal, Violetta Andriolo, Angela Bechthold, Sabrina Schlesinger, Heiner Boeing
The aim of this systematic review and meta-analysis was to summarize the evidence on the relation of the intakes of 12 major food groups, including whole grains, refined grains, vegetables, fruits, nuts, legumes, eggs, dairy, fish, red meat, processed meat, and sugar-sweetened beverages (SSBs) with the risk of hypertension. PubMed, Scopus, and Web of Science were searched systematically until June 2017 for prospective studies having quantitatively investigated the above-mentioned foods. We conducted meta-analysis on the highest compared with the lowest intake categories and linear and nonlinear dose-response meta-analyses to analyze the association...
November 2017: Advances in Nutrition
https://www.readbyqxmd.com/read/29140746/inactivation-kinetics-of-pathogens-during-thermal-processing-in-acidified-broth-and-tomato-pur%C3%A3-e-ph-4-5
#13
Evann L Dufort, Jonathan Sogin, Mark R Etzel, Barbara H Ingham
Thermal inactivation kinetics for single strains of Shiga toxin-producing Escherichia coli (STEC), Listeria monocytogenes, and Salmonella enterica were measured in acidified tryptic soy broth (TSB; pH 4.5) heated at 54°C. Inactivation curves also were measured for single-pathogen five-strain cocktails of E. coli O157:H7, L. monocytogenes, and S. enterica heated in tomato purée (pH 4.5) at 52, 54, 56, and 58°C. Inactivation curves were fit using log-linear and nonlinear (Weibull) models. The Weibull model yields the time for a 5-log reduction (t*) and a curve shape parameter (β)...
November 15, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/29140716/transversely-divergent-second-harmonic-generation-by-surface-plasmon-polaritons-on-single-metallic-nanowires
#14
Yang Li, Meng Kang, Junjun Shi, Ke Wu, Shunping Zhang, Hongxing Xu
Coherently adding up signal wave from different locations are a prerequisite for realizing efficient nonlinear optical processes in traditional optical configurations. While nonlinear optical processes in plasmonic waveguides with subwavelength light confinement are in principle desirable for enhancing nonlinear effects, so far it has been difficult to improve the efficiency due to the large momentum mismatch. Here we demonstrate, using remotely excited surface plasmon polaritons (SPPs), axial collimated but transversely divengent second harmonic (SH) generation in a single silver nanowire - monolayer molybdenum disulfide hybrid system...
November 15, 2017: Nano Letters
https://www.readbyqxmd.com/read/29140715/measurement-of-charge-transfer-to-aqueous-droplets-in-high-voltage-electric-fields
#15
Eric S Elton, Yash Tibrewala, Ethan R Rosenberg, Brad S Hamlin, William D Ristenpart
The electric charge acquired by aqueous droplets when they contact an electrode is a crucial parameter in experimental and industrial applications where electric fields are used to manipulate droplet motion and coalescence. For unclear reasons, many investigators have found that aqueous droplets acquire significantly more positive than negative charge. Extant techniques for determining the droplet charge typically rely on a hydrodynamic force balance that depends on accurate characterization of the drag forces acting on the droplet...
November 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29140364/bose-hubbard-hopping-due-to-resonant-rayleigh-scattering
#16
Andrey B Matsko, Lute Maleki
We show theoretically that dynamic behavior of light confined in the modes of a nonlinear optical ring cavity characterized by resonant Rayleigh scattering can be described using the Bose-Hubbard model. Nonlinear interaction between clockwise and counterclockwise optical modes results in instability and intermode hopping occurring at a rate defined by the frequency separation of the Rayleigh doublet harmonics. Hopping may lead to an instability and breathing behavior of a Kerr frequency comb observed in the cavity...
November 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/29140363/snapshot-second-harmonic-generation-polarimeter-based-on-spectral-analysis
#17
Matthieu Dubreuil, Sylvain Rivet, Yann Le Grand
A new high-speed second-harmonic generation (SHG) polarimetric method is reported. It is based on the spectral analysis of the SHG radiation emitted by a nonlinear medium excited with circularly polarized femtosecond laser pulses. The setup uses only passive components for polarization encoding and a fast spectrometer for spectral analysis. The method is validated on a z-cut quartz plate, then on a collagen-rich biological tissue with a view to single image polarization-resolved SHG microscopy.
November 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/29140361/self-referenced-octave-wide-subharmonic-gap-optical-parametric-oscillator-centered-at-3%C3%A2-%C3%A2-%C3%AE-m-and-pumped-by-an-er-fiber-laser
#18
Qitian Ru, Zachary E Loparo, XiaoSheng Zhang, Sean Crystal, Subith Vasu, Peter G Schunemann, Konstantin L Vodopyanov
We report an octave-wide mid-IR spectrum (2.3-4.8 μm) obtained from a subharmonic optical parametric oscillator (OPO) based on a newly developed nonlinear crystal, orientation-patterned gallium phosphide (OP-GaP), which was synchronously pumped by a femtosecond 1560 nm fiber laser. We proved that the octave-wide output is in the form of a single frequency comb. The observed f-to-2f frequency beats, originating directly from the OPO, can be used for self-referencing and phase locking of the pump laser comb with no need for supercontinuum generation...
November 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/29140359/ns-duration-transient-bragg-gratings-in-silica-fibers
#19
Avishay Shamir, Aviran Halstuch, Yonatan Sivan, Amiel A Ishaaya
We demonstrate, for the first time to our knowledge, fast all-optical switching in standard silica fibers, based on a transient Bragg grating. The grating is implemented in the fiber using an immunization photo-pretreatment process, followed by side illumination with femtosecond laser pulses through a suitable phase mask. Each pulse is nonlinearly absorbed, creating a thermal grating that is washed out by thermal diffusion. Reflections measured from such gratings are characterized by a very fast rise time, nanoseconds duration, and a high extinction ratio...
November 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/29140353/atom-mediated-spontaneous-parametric-down-conversion-in-periodic-waveguides
#20
Sina Saravi, Alexander N Poddubny, Thomas Pertsch, Frank Setzpfandt, Andrey A Sukhorukov
We propose the concept of atom-mediated spontaneous parametric down-conversion, in which photon-pair generation can take place only in the presence of a single two-level emitter, relying on the bandgap evanescent modes of a nonlinear periodic waveguide. Using a guided signal mode, an evanescent idler mode, and an atom-like emitter with the idler's transition frequency embedded in the structure, we find a heralded excitation mechanism, in which the detection of a signal photon outside the structure heralds the excitation of the embedded emitter...
November 15, 2017: Optics Letters
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