bluuebunny/crossref_metadata_2025 huggingface dataset:
Capacitive-mediated strong coupling in terahertz plasmonic metafilms
Authors: Yahiaoui Riad , Chase Zizwe A. , Kyaw Chan , Noe G. Tim , Baydin Andrey , Tay Fu Yang , Strait Jared , Sun Junyeob , Kono Junichiro , Argawal Amit , Searles Thomas A.
Published: September 2020

We report terahertz metafilms designed to strongly couple hybridized lattice and fundamental dipole modes to form polaritons. By altering the metafilm’s capacitance, the coupling strength of the dipole-lattice coupling is ttrned from weak to strong.
Nanostructure-Enhanced Absorption in Thermoelectric photodetector
Authors: Sharma Nityanand , Bar-David Jonathan , Mazurski Noa , Levy Uriel
Published: September 2020

We experimentally demonstrate a thermoelectric photodetector combined with nanostructured thin-film broadband super-absorber in the visible to short wave infrared with an order of magnitude enhanced sensitivity as compared to a flat metal film device.
Nondiffracting Waves that Auto-Disrupt: Designing Novel Wavepackets Using Electromagnetic Singularities
Authors: Wong Liang Jie , Christodoulides Demetrios , Kaminer Ido
Published: September 2020

We introduce the use of electromagnetic singularities in complex space-time as a robust means of designing new exotic wavepackets, exemplified by nondiffracting pulses that auto-disrupt in free space at userchosen places.
Piezoelectric Optomechanics in the Quantum Regime
Authors: Forsch Moritz , Stockill Robert , Beaudoin Grégoire , Pantzas Konstantinos , Sagnes Isabelle , Braive Rémy , Groblacher Simon
Published: September 2020

We show a 1D optomechanical crystal fabricated from gallium phosphide. We operate this device in the quantum ground state of motion and observe non-classical correlations between photons and phonons using a DLCZ scheme.
Versatile Alligator Nanostructures for Quantum Networks with Solid-State Emitters
Authors: Chen Kevin , Bersin Eric , Walsh Michael , Mouradian Sara , Englund Dirk
Published: September 2020

We report design and fabrication of novel “alligator” nanostructures as both a high-Q photonic crystal cavity that helps preserve NV centers’ optical coherence and a polarization-selective mirror for high-fidelity quantum state transfer.
A quantum plasmonic launcher for integrated ultrafast single-photon sources
Authors: Chiang Chin-Cheng , Bogdanov Simeon I. , Makarova Oksana A. , Xu Xiaohui , Saha Soham , Shah Deesha , Wang Di , Lagutchev Alexei S. , Kildishev Alexander V. , Boltasseva Alexandra , Shalaev Vladimir M.
Published: September 2020

We demonstrate a quantum plasmonic launcher - a metal-based chip-compatible nanostructure featuring near-THz emission rates. Nanodiamonds with single NV centers are sandwiched between two silver films coupling about half of the emission into in-plane surface plasmons.
Tunable Bandgap Renormalization by Nonlocal UltraStrong Coupling in Nanophotonics
Authors: Kurman Yaniv , Kaminer Ido
Published: September 2020

We find up-to 100meV bandgap shift in a semiconductor when stated near graphene. The graphene plasmons vacuum fluctuations enable nonlocal interactions between a single semiconductor electron and all available valence states to reach ultra-strong coupling.
Nonreciprocal Acoustic Transmission using Lithium Niobate Parity-Time-Symmetric Resonators
Authors: Shao Linbo , Mao Wenbo , Maity Smarak , Sinclair Neil , Hu Yaowen , Yang Lan , Loncar Marko
Published: September 2020

Taking advantage of the piezoelectricity of lithium niobate, we achieve nonreciprocal transmission of 10 decibels for a 200-MHz surface acoustic wave using parity-time- symmetric resonators and demonstrate one-way circulation of acoustic waves.
Plasmonic Nanoantenna-Enhanced Adiabatic Wavelength Conversion using a Time-varying Epsilon-near-zero-based Metasurface
Authors: Pang Kai , Alam M. Zahirul , Zhou Yiyu , Reshef Orad , Liu Cong , Manukyan Karapet , Voegtle Matt , Pennathur Anuj , Tseng Cindy , Su Xinzhou , Song Hao , Zhao Zhe , Zhang Runzhou , Song Haoqian , Hu Nanzhe , Almaiman Ahmed , Dawlaty Jahan M. , Boyd Robert W. , Tur Moshe , Willner Alan E.
Published: September 2020

We experimentally demonstrate adiabatic wavelength conversion using a time-varying epsilon-near-zero-based metasurface. We observe up to 47-mn redshift with 4-GW/cnr pump peak intensity. The wavelength shift depends on both pump-probe delay time and pmnp peak intensity.
Enhanced Resolution Imaging By Aperiodically Perturbed Photonic Time Crystals
Authors: Manzoor Zahra , Taravati Sajjad
Published: September 2020

This study presents enhanced resolution imaging systems formed by aperiodically perturbed temporal photonic crystals. Such crystals excite low loss high modes with wavenumbers above diffraction limit and ability to manipulate Floquet mode’s phase and amplitude.
Spatial modulation of free-electron wavepackets by shaping ultrafast plasmonic excitations
Authors: Tsesses Shai , Dahan Raphael , Wang Kangpeng , Reinhardt Ori , Bartal Guy , Kaminer Ido
Published: September 2020

By engineering the boundary conditions of plasmonic excitations, we present a novel method for electron wavefront shaping utilizing the ultrafast interaction of femtosecond free- electron and laser pulses in plasmonic samples.
High-gain twin-beam generation in waveguides: from Maxwell’s equations to efficient simulation
Authors: Quesada Nicolas , Trigmer Gil , Vidrighin Mihai D. , Sipe J.E.
Published: September 2020

We provide an efficient method for the calculation of the quantum state describing high-gain, twin-beam generation in waveguides that is derived from a canonical treatment of Maxwell’s equations and accommodates self- and cross-phase modulation.
Towards Frequency-Transverse-Mode Hybrid-Entangled Photon-Pair Generation in Optical Fiber
Authors: Kim D.-B. , Fang B. , Wang O. , Hu X. , Zhang Y. , Chen X. , Garay-Palmett K. , U’Ren A. B. , Lorenz V. O.
Published: September 2020

We present stimulated-emission-based characterization of transverse photonpair modes in birefringent fiber, towards an optical fiber source of photon-pairs hybrid-entangled in frequency and transverse spatial mode.
Time-frequency multiplexed single-photon source based on LiNbO3 modulators
Authors: Massaro Marcello , Ansari Vahid , Schlue Fabian , Luo Kai-Hong , Herrmann Harald , Brecht Benjamin , Silberhorn Christine , Dirmeier Thomas , Marquardt Christoph , Leuchs Gerd
Published: September 2020

We present advances in the use of gigahertz LiNbO3 modulators enabling us programmable delays, which we will use to implement a multiplexed single-photon source, based on birefringent phase-matching in KTP waveguides.
Semiconductor III-V Nanowires as Building Blocks for Flexible Nonlinear Photonic Components
Authors: Saerens G. , Tang I. , Bloch E. , Frizyuk K. , Escalé M. Reig , Renaut C. , Timpu F. , Vogler-Neuling V. , Shtrom I. , Semenova E. , Lebedkina E. , Bouravleuv A. , Sadrieva Z. , Cirlin G. , Petrov M. , Grange R. , Timofeeva M.
Published: September 2020

We show two functionalities of GaAs nanowires to control the second harmonic generation: beam steering up to 30° in sliced nanoantenna and three orders of magnitude enhancement within 3% stretching in mechanically tunable metamaterials.
What Is the Origin of Second Harmonic Generation in Strained Silicon Waveguides?
Authors: Trenti Alessandro , Castellan Claudio , Vecchi Chiara , Marchesini Alessandro , Mancinelli Mattia , Ghulinyan Mehr , Pucker Georg , Pavesi Lorenzo
Published: September 2020

A study of SHG in silicon waveguides strained by a silicon nitride cladding is reported. Interestingly, the dominant role in the measured SHG is due to charges in the cladding and not from strain effect.
Experimental Demonstration of Self-Phase-Modulation Induced Wavelength Shift in an 80-nm thick ITO-ENZ Material in the Telecom c Band
Authors: Liu Cong , Alam M. Zahirul , Pang Kai , Manukyan Karapet , Hendrickson Joshua R. , Smith Evan M. , Zhou Yiyu , Reshef Orad , Song Hao , Zhang Runzhou , Song Haoqian , Alishahi Fatemeh , Fallahpour Ahmad , Almaiman Ahmed , Boyd Robert W. , Tur Moshe , Willner Alan E.
Published: September 2020

We experimentally demonstrate self-phase-modulation-induced wavelength silifl of up- to 15 nm in an 80-nm-tliick ITO at a zero-permittivity wavelength of 1550 nm. We also explore tlie effect oftlie pmnp pulse temporal duration on tlie wavelength silift.
Coherent Mid-Infrared Supercontinuum Sources in SiliconGermanium Waveguides
Authors: Torre Alberto Della , Sinobad Milan , Armand Rémi , Luther-Davis Barry , Ma Pan , Madden Stephen , Debbarma Sukanta , Vu Khu , Moss David J. , Mitchell Arnan , Hartmann Jean-Michel , Fedeli Jean-Marc , Monat Christelle , Grillet Christian
Published: September 2020

We report coherent mid-infrared supercontinuum generation in silicon-germanium waveguides. We show that the degree of coherence can be controlled by either employing an air clad configuration or a hybrid chalcogenide/silicon-germanium system.
Topologically protected acoustic wave amplification in an optomechanical array
Authors: Ma Jingwen , Feng Ziyao , Li Yuan , Sun Xiankai
Published: September 2020

By exploiting the simultaneous particle-conserving and particle-nonconserving phonon- photon interactions in an optomechanical array, we find a topologically protected edge state for phonons that can be parametrically amplified when all the bulk states remain stable.
High-Resolution Imaging in Arbitrarily Heavily Scattering Random Media with Speckle Correlations over Object Position
Authors: Luo Qiaoen , Hastings Ryan , Webb Kevin J.
Published: September 2020

A general theory is presented for speckle intensity correlations over object position that allows an arbitrary object to be imaged through an amount of random scatter limited by detector noise, with retention of subwavelength information.
Statistics of individual eigenchannels of diffusive random medium
Authors: Yamilovi A. , Benderc N. , Yilmaz H. , Cao H.
Published: September 2020

We measure correlations between individual transmission eigenchannels in a unique on- chip photonic platform that allows both selective coupling of light into a single eigenchannel and direct probe of its spatial structure inside the random medium.
Chromatically coupled silicon photonic resonators for high purity single-photon generation
Authors: Faruque Imad I. , Sinclair Gary F. , Burridge Ben , McCutcheon Will , Borghi Massimo , Barreto Jorge , Rarity John G.
Published: September 2020

We present experimental results on single-photon generation using compact chromatically-coupled resonators on an SOI platform. We measure a purity of 96%, beyond the 92% purity limitation of conventional structures, in agreement with our simulated model.
Mid infrared heralded single photons on a silicon chip
Authors: Signorini Stefano , piccione Sara , Fontana Giorgio , Pavesi Lorenzo , Ghulinyan Mher , Bernard Martino , Pucker Georg
Published: September 2020

Despite the large interest in developing mid infrared quantum photonics, an integrated source of single photons beyond 2 um is still missing. Here, we demonstrate the first mid infrared heralded single photon source based on silicon photonics.
Frequency-Domain Quantum Interference with Entangled Photons from an Integrated Microresonator
Authors: Joshi Chaitali , Farsi Alessandro , Dutt Avik , Kim Bok Young , Ji Xingchen , Zhao Yun , Bishop Andrew , Lipson Michal , Gaeta Alexander
Published: September 2020

We report frequency-domain quantum interference with spectrally distinct photons from a microresonator. We create an active, tunable ‘frequency beam splitter’ via Bragg-scattering four- wave mixing and achieve interference visibilities of 0.95 ±0.02.
Transmission [Normalized) Demonstration of on chip cavity to thermal Rb vapor strong coupling
Authors: Naiman Alex , Sebbag Yoel , Levy Uriel
Published: September 2020

We experimentally demonstrate a chip scale platform supporting strong coupling between hot atomic rubidium vapor and a whispering gallery mode, with diverse applications in quantum photonics, sensing, nonlinear physics, chemistry and more.
Geometric Phase Metasurface Hologram for Optical Tractor Beam Generation
Authors: Cadusch Jasper , Wen Damian , Meng Jiajun , Crozier Kenneth B.
Published: September 2020

We present a geometric phase silicon metasurface hologram design intended to produce a non-diffracting solenoid beam. Such optical beams have been shown to exert long range retrograde (i.e. toward source) optical forces on light-scattering particles.
Patterning Refractive Index on the Surface of a Chip by Direct Nanoimprinting
Authors: Perez Julius C. , Talukdar Tahmid H. , Ryckman Judson D.
Published: September 2020

We demonstrate a means for patterning refractive index on the surface of a chip by directly imprinting porous nanomaterials. This offers a new route toward high index contrast and low-cost chip-scale diffractive, waveguided and meta-optic devices.
Unidirectional Luminescence from InGaN/GaN Quantum-Well Metasurfaces
Authors: DeCrescent Ryan A. , Iyer Prasad P. , Mohtashami Yahya , Lheureux Guillaume , Butakov Nikita A. , Alhassan Abdullah , Weisbuch Claude , Nakamura Shuji , DenBaars Steven P. , Schuller Jon. A.
Published: September 2020

We demonstrate metasurface-based designs of InGaN/GaN quantum-well structures that generate narrow, unidirectional emission lobes at arbitrary engineered angles. The metasurface structuring also leads to ~100-fold enhancements in photoluminescence efficiencies for emission into air.
Ultrafast optical switching and power limiting in intersubband polaritonic metasurfaces
Authors: Mann Sander A , Nookala Nish , Johnson Samuel , Mekkawy Ahmed , Klem John F. , Brener Igal , Raschke Markus , Alù Andrea , Belkin Mikhail A.
Published: September 2020

We experimentally demonstrate a nonlinear metasurface comprising plasmonic resonators coupled to multi-quantum well transition. Due to MQW saturation, the metasurface provides a giant j(3) on the order of 3x10-13 m2/V2 with ~2 ps response time.
Experimentally Realizing Photonic Topological Edge States in 3D
Authors: Lustig Eran , Maczewsky Lukas , Biesenthal Tobias , Yang Zhaoju , Plotnik Yonatan , Szameit Alexander , Segev Mordechay
Published: September 2020

We demonstrate photonic structures supporting topological edge-states propagating in full 3D. These robust edge-states propagate in a screw motion in a 3D topological insulator with two spatial dimensions and one synthetic dimension.
Universal conversion of topological singularities from momentum to real space
Authors: Liu Xiuying , Xia Shiqi , Jajtic Ema , Song Daohong , Li Denghui , Tang Liqin , Leykam Daniel , Xu Jingjun , Buljan Hrvoje , Chen Zhigang
Published: September 2020

We demonstrate universal conversion of topological singularities in momentum-space (Dirac points) to topological defects in real-space (optical vortices). We show that this conversion persists even in stretched lattices, topologically protected by a quantized Berry phase.
Machine Learning-based Diffractive Imaging with Subwavelength Resolution
Authors: Ghosh Abantika , Roth Diane J. , Nicholls Luke H. , Wardley William P. , Zayats Anatoly , Podolskiy Viktor A.
Published: September 2020

We report detection and characterization of wavelength-scale objects with subwavelength resolution by combining diffractive imaging and machine learning. The technique clarifies the information channels in the diffraction imaging and provides insight into machine learning processes.
Towards Spin-Multiphoton Entanglement using Quantum Dots with Asymmetric Waveguide Coupling
Authors: Appel Martin Hayhurst , Tiranov Alexey , Tiurev Konstantin , Javadi Alisa , Wang Ying , Milodo Leonardo , Scholz Svend , Wieck Andreas D. , Ludwig Arne , Warburton Richard J. , Lodahl Peter
Published: September 2020

We demonstrate selectively enhanced dipoles of an InAs quantum dot embedded in a nanophotonic waveguide, thereby forming optical cycling transitions, a basic tool for scalable spin-multiphoton entanglement generation.
Integration of rare earth ions and photonic resonators for quantum application
Authors: Pak Dongmin , Nandi Arindam , Jiang Xiaodong , Perry Daniel , Bielejec Edward S , Xuan Yi , Hosseini Mahdi
Published: September 2020

Using ion implantation, on-chip photonic fabrication and heterogeneous integration, we demonstrate a solid-state interface between rare earth ions and telecomm photons in various designs. The platforms enable study of collective and coherent light-atom interactions on chip.
Measuring the dark exciton in a quantum dot inside a planar microcavity using a bright state cycling transition
Authors: Müller Markus , Cao Bin , Solomon Glenn S.
Published: September 2020

We demonstrate the resonant excitation of a so-called dark exciton state in a quantum dot with a readout scheme based on the resonance fluorescence of the correlated bright exciton.
Time delays from one-photon transitions in the continuum
Authors: Fuchs Jaco , Douguet Nicolas , Donsa Stefan , Martin Fernando , Burgdorfer Joachim , Argenti Luca , Cattaneo Laura , Keller Ursula
Published: September 2020

We experimentally resolve the time delay of electron wave packets arising from one- photon transitions in the continuum. This allows us to determine and quantify the angular momentum dependence of the photoionization time delay.
Control of electron recollision and molecular nonsequential double ionization
Authors: Li Shuai , Sierra-Costa Diego , Michie Matthew J. , Ben-Itzhak Itzik , Dantus Marcos
Published: September 2020

Control of electron recollision and molecular nonsequential double ionization via pulse shaping was obtained on ethane. A model based on sudden jump in driving frequency is found to be in excellent agreement with experimental results.
On the Quantum-Optical Nature of High Harmonic Generation
Authors: Gorlach Alexey , Neufeld Ofer , Rivera Nicholas , Cohen Oren , Kaminer Ido
Published: September 2020

We show novel effects in high harmonic generation arising from the quantum nature of light. These effects include multiple shifted combs of high harmonics, where each photon carries all the spectral information of the combs.
Design of Tunable Nanophotonic Devices
Authors: Atwater Harry A.
Published: September 2020

This tutorial addresses design of tunable nanophotonic arrays, enabling dynamic, active control of the properties of light - amplitude, phase, wavevector, wavelength and polarization - opening new applications such as optical beam steering, focusing and wavefront engineering.
Dynamic Beam Steering by All-Dielectric Magneto-Optical Nanoantennas
Authors: Faniayeu Ihar , Dmitriev Alexander
Published: September 2020

We propose employing magneto-optic nanoantenna based on split-ring resonator of bismuth-yttrium iron garnets that allows transmitted optical beam steering using externally applied low magnetic field. The proposed magnetic nanoantenna produces a few-degrees spanning of the optical beam propagation direction, controlled by the strength of the external magnetic field.
Topological evolution-invariant photonic structures in synthetic dimensions
Authors: Nemirovsky Liat , Cohen Moshe-Ishay , Lumer Yaakov , Lustig Eran , Segev Mordechai
Published: September 2020

We present topologically-protected propagation of unidirectional edge states at the interface between two dynamically-invariant systems with opposite effective magnetic field in synthetic dimensions.
Two-dimensional Zitterbewegung analog in symmetry-breaking photonic honeycomb lattices
Authors: Liu Xiuying , Dai Zhixuan , Song Daohong , Zhang Zhiming , Xia Shiqi , Tang Liqin , Buljan Hrvoje , Xu Jingjun , Chen Zhigang
Published: September 2020

We demonstrate photonic analog of 2D Zitterbewegung of an optical wavepacket in inversion-symmetry-breaking honeycomb lattices by exciting modes around the gapped Dirac points, leading to self-rotation of the “center-of-mass” mediated by Berry curvature.
Performing Spatial Differentiation and Edge Detection with Dielectric metasurfaces
Authors: Pan Danping , Wan Lei , Potapov Alexander A. , Feng Tianhua
Published: September 2020

Spatial differentiation and edge detection have been proposed to realize with a dielectric metasurface by engineering the spatial dispersion of electric dipole resonance. The results show excellent performances for 2D images.
Conversion from Telecom to Atomic Photons by Four-Wave Mixing in a Warm Rb Cell
Authors: Piotrowicz Michał J , Black Adam , Bashkansky Mark
Published: September 2020

We convert telecom photons at 1530 nm to atomic photons on the 87Rb D1 transition at 795 nm in a warm vapor with efficiency near 10% by employing efficient optical pumping and four-wave mixing.
Single-shot quantitative phase microscopy assisted by an all-dielectric metasurface
Authors: Engay Einstom , Huo Dewang , Malureanu Radu , Wetzel Alexandre , Bunea Ada-Ioana , Rodrigo Peter John , Lavrinenko Andrei
Published: September 2020

We present a new approach for simultaneous capture of two images using a metasurface made of titania nanopillars. We use this technique to make quantitative phase measurements by employing the transport of intensity model.
A Space Compression Optic
Authors: DelMastro Michael , Reshef Orad , Bearne Katherine , Alhulaymi Ali , Giner Lambert , Boyd Robert W. , Lundeen Jeff S.
Published: September 2020

We theoretically introduce a new optic, a plate that reduces propagation length for image formation. We experimentally demonstrate it advances a beam’s focus and shifts an obliquely incident beam identically to a longer propagation distance.
Passive, Thermal, Reference-Free, Non-Line-of-Sight Imaging
Authors: Divitt Shawn , Gardner Dennis F. , Watnik Abbie T.
Published: September 2020

We demonstrate passive image recovery of mid-infrared thermal objects around comers using speckle correlation techniques.
Giant resonant enhancement of optical binding of dielectric disks
Authors: Bulgakov E. N. , Pichugin K. N. , Sadreev A. F.
Published: September 2020

Two-fold variation over the aspect ratio of each disk and distance between disks gives rise to numerous events of avoided crossing of resonances of individual disks. For these events, the hybridized anti-bonding resonant modes can acquire a morphology close to the Mie resonant mode with the high orbital momentum of an equivalent sphere. The

Q

factor of such resonance can exceed the

Q

factor of an isolated disk by two orders of magnitude. We show that dual incoherent counterpropagating coaxial Bessel beams with power

1

m
W

/

µ

m

2

with frequency resonant to such anti-bonding Mie-like modes result in unprecedented optical binding forces up to tens of nano-Newtons for silicon micrometer-sized disks. We show also that the magnitude and sign of optical forces depend strongly on the longitudinal wave vector of the Bessel beams.
Terahertz optical thickness and birefringence measurement for thermal barrier coating defect location
Authors: Waddie Andrew J. , Schemmel Peter J. , Chalk Christine , Isern Luis , Nicholls John R. , Moore Andrew J.
Published: September 2020

We present a normal incidence terahertz reflectivity technique to determine the optical thickness and birefringence of yttria-stabilized zirconia (YSZ) thermal barrier coatings (TBCs). Initial verification of the method was achieved by measurement of a set of fused silica calibration samples with known thicknesses and showed excellent agreement (<1% of refractive index) with the literature. The THz-measured optical thickness and its variation through the depth profile of the YSZ coating are shown to be in good agreement (<4%) with scanning electron microscope cross-sectional thickness measurements. In addition, the position of discontinuities in both the optical thickness and birefringence appear to be correlated to coating failure points observed during accelerated aging trials.
Multi-layer light trapping structures for enhanced solar collection
Authors: Alsaigh Rakan E. , Bauer Ralf , Lavery Martin P. J.
Published: September 2020

Light trapping is a commonly used technique for enhancing the efficiency of solar collection in many photovoltaic (PV) devices. In this paper, we present the design of multi-layer light trapping structures that can potentially be retrofitted, or directly integrated, onto crystalline or amorphous silicon solar panels for enhanced optical collection at normal and extreme angle of incidence. This approach can improve the daily optical collection performance of solar panel with and without internally integrated light trapping structure by up to 7.18% and 159.93%, respectively. These improvements predict an enhancement beyond many research level and commercially deployed light trapping technologies. We further enhance this performance by combining our multi-layer optics with high refractive index materials to achieve a daily optical collection of up to 32.20% beyond leading light trapping structures. Our additive light trapping designs could enable the upgradeability of older PV technologies and can be tailored to optimally operate at unique angular ranges for building exteriors or over a wide range of incidence angle for applications such as unmanned aerial vehicles.
Adaptive single photon detection under fluctuating background noise
Authors: Chen Zhen , Liu Bo , Guo Guangmeng
Published: September 2020

To enhance the performance of single photon lidar in remote sensing applications, an adaptive single photon detection method under fluctuating background noise is proposed in this work. Given a desired false alarm probability, an adaptive threshold can be determined according to the background noise in real time. As a result, the single photon lidar operating under fluctuating background noise can implement high sensitivity and low false alarm rate simultaneously. Experiments are performed to verify the proposed method, and the experimental results are in accordance well within the theoretical values. In addition, the mean number of echo photons can be estimated in a fluctuating background noise environment, and the estimation accuracy is less than 1 photon.
Betatron radiation polarization control by using an off-axis ionization injection in a laser wakefield acceleration
Authors: Zhang Guobo , Chen Min , Yang Xiaohu , Liu Feng , Weng Suming , Ma Yanyun , Zou Debin , Yu Tongpu , Shao Fuqiu , Sheng Zhengming
Published: September 2020

Tunable X-ray sources from a laser-driven wakefield have wide applications. However, due to the difficulty of electron dynamics control, currently the tunability of laser wakefield–based X-ray sources is still difficult. By using three-dimensional particle-in-cell simulations, we propose a scheme to realize controllable electron dynamics and X-ray radiation. In the scheme, a long wavelength drive pulse excites a plasma wake and an off-axis laser pulse with a short wavelength co-propagates with the drive pulse and ionizes the K-shell electrons of the background high-Z gas. The electrons can be injected in the wakefield with controllable transverse positions and residual momenta. These injected electrons experience controllable oscillations in the wake, leading to tunable radiations both in intensity and polarization.
Tunable optical spatial differentiation in the photonic spin Hall effect
Authors: Mi Chengquan , Song Wanye , Cai Xiang , Yang Chunxia , Song Yujun , Mi Xianwu
Published: September 2020

Optical differential operation and image edge detection have shown some unique advantages, including faster operating speeds and lower power consumption, compared to a digital image processor. Here, we examine the origin of optical differentiator in the photonic spin Hall effect. We find that the optical differentiator in x direction is related to the beam divergence when the incident angle of the central wave vector meets Brewster's, while the optical differentiator in y direction is related to the cross polarization component. By eliminating the H-H or V-V polarization component, the H-V or V-H polarization component induced the spin-dependent splitting in the photonic spin Hall effect, which can be used for the one-dimensional optical differentiator in an arbitrary direction. Furthermore, we investigate the photonic spin Hall effect and double-peak profile near Brewster angle and predict that a perfect two-dimensional optical differentiator will become a reality.
Chirped and apodized grating couplers on lithium niobate thin film
Authors: Chen Zhihua , Ning Yufu , Xun Yang
Published: September 2020

Chirped and apodized grating couplers were designed, fabricated and characterized in lithium niobate thin film for fiber-to-chip coupling. The maximum coupling efficiency of -1.8 dB and -6.9 dB for TE mode at a wavelength of 1550 nm was simulated and measured, respectively. The discrepancies were mainly attributed to the different fabrication errors of local periods and groove widths, which hampered the mode matching condition heavily. In addition, when a metal bottom reflector was added, the simulated and measured coupling efficiency were improved to -0.8 dB and -5.5 dB, respectively.
Orígenes y desarrollo de los anzuelos de pesca en la península ibérica. De la Prehistoria a la Edad Media
Authors: Vargas Girón José Manuel
Published: September 2020

En este trabajo presentamos un estado de la cuestión sobre los anzuelos de pesca en la Península Ibérica. Para ello realizaremos un análisis diacrónico desde las primeras evidencias que se conocen en el registro arqueológico prehistórico hasta época medieval. Se tratará de analizar cómo ha sido su evolución a lo largo de la historia, definiéndose los principales hitos tecnológicos que han ido produciéndose hasta llegar a configurarse el modelo de anzuelo que conocemos en la actualidad, y considerándose, al mismo tiempo, cuáles son aquellos rasgos morfo-tipológicos que han perdurado/desaparecido y cuáles han sido transformados/sustituidos. Todo ello nos permitirá valorar aspectos históricos de gran importancia como pueden ser el origen geográfico de las innovaciones y su difusión a escala atlántico-mediterránea a través de posibles fenómenos de interacción cultural.
Los Orientes y Occidentes de Freyre: temática orientalista en Casa-grande & Senzala y el Occidente en Sobrados e Mucambos
Authors: Reis De Souza Arlindo José
Published: September 2020

Centrado en uno de los aspectos principales de nuestra tesis doctoral, titulada Os orientes de Freyre: tópica orientalista e luso-tropicalismo, el artículo que presentamos aquí tiene la intención de proponer el análisis de algunos aspectos de dos de los libros de Gilberto Freyre. En Casa-grande & Senzala (1933), analizaremos lo que llamamos tema orientalista, es decir, trataremos de entender cómo el autor retrata el tema “orientes”. En relación a Sobrados e Mucambos (1936) analizaremos las dos concepciones de Occidente que Freyre desarrolla allí. Aunque la tesis en curso analiza el tema orientalista antes mencionado en una sección más amplia del trabajo del autor, contemplaremos aquí solo estas obras en las que los aspectos que consideramos centrales para el estudio se consolidan: las nociones de Occidente y Oriente, que guían las valoraciones de Freyre sobre Brasil y Portugal en su imperialismo multisecular.
Interpretación del patrimonio: necesidad de diálogo entre educación y ciudadanía en Brasil
Authors: Caponero Maria Cristina , Leite Edson
Published: September 2020

El presente artículo aborda el diálogo entre la interpretación y preservación del patrimonio, la educación y la ciudadanía. A partir de un breve recorrido histórico, intentamos conceptuar la interpretación del patrimonio, sus principios, fundamentos, objetivos y agentes implicados, así como presentar las etapas metodológicas de un plan de interpretación de las obras sean de naturaleza pictórica, escultórica o arquitectónica, reconociendo los elementos específicos y propios de cada cual. Con este propósito, intentamos demostrar, por medio de la teoría y de la observación del Projeto Oficina Escola de Artes e Ofícios (POEAO), que las prácticas de interpretación y educación patrimonial son relevantes para la preservación de la memoria y del patrimonio cultural, fomentando la participación de la comunidad en un proceso de fortalecimiento de la ciudadanía, siguiendo la estrategia secuencial de Tilden (1957): interpretación–comprensión–apreciación–protección.
Saudades de Cantagalo: nuevos datos sobre la desconocida biografía brasileña de Américo Castro
Authors: González Velasco Pablo
Published: September 2020

El texto es el resultado de una investigación sobre la brasileñidad de Américo Castro, a través de las fuentes locales de Cantagalo (Rio de Janeiro, Brasil), su municipio natal, y la hemeroteca brasileña. La investigación aborda diferentes ámbitos: la ubicación de la casa de nacimiento, la situación de la familia, las actividades de su visita en 1946, sus impresiones de Cantagalo, los reconocimientos post mortem, así como las “saudades” que expresaba por carta a sus amigos brasileños. Sin pretender cuestionar, en líneas generales, las interpretaciones de sus discípulos, cabe realizar nuevos análisis biográficos complementarios, dando énfasis a su primera infancia brasileña (lusófona) y su capacidad de comprensión de la pluralidad étnica.
Chronic unpredictable stress-induced inflammation and quantitative analysis of neurons of distinct brain regions in Wistar rat model of comorbid depression
Authors: Blossom Vandana , Gokul Megha , Kumar Nayanatara Arun , Kini Rekha D. , Nayak Shyamala , Bhagyalakshmi K.
Published: September 2020

Background and Aim: Depression and anxiety are the most prominent neuropsychiatric disease and have been considered as the most burdensome diseases of society. The hippocampus and prefrontal cortex have a prominent role in stress-induced neurological disorders. Chronic unpredictable stress exposed rats are a perfect model in understanding comorbid depression and anxiety disorders. The inflammatory response occurring in the body has been linked to C-reactive protein (CRP) in many diseased conditions. The present research primarily focus on the possible correlation of Cortisol, CRP level and neuronal assay in different regions of hippocampus, dentate gyrus (DG), and prefrontal cortex. Materials and Methods: The control group of rats (n=6) was not exposed to any stress. Whereas, the experimental stress group (n=6) of rats was exposed to various stressors for 15 days. After the experimentation procedures, the blood samples were collected and brain dissection was done. The neurons in the prefrontal cortex, the DG along with various hippocampal regions was counted. Statistical analysis was performed using student's t-test and p<0.05 was expressed as statistically significant. Results: Animals exposed to chronic unpredictable stressors showed a significant (p<0.0001) decrease in the neuronal count in prefrontal cortex and hippocampus. A significant rise in the serum cortisol (p<0.0001) and CRP (p<0.001) was witnessed in the stressed group. Conclusion: Our results demonstrate that chronic unpredictable stress exposure has affected neurogenesis in prefrontal cortex and hippocampal regions. Decreased neurogenesis was well in coordinance with the increase in cortisol and CRP. The chronic unpredictable stress-induced inflammatory response correlated to various brain regions might provoke insights into a variety of new drugs targeting neurogenesis.
Desenvolvimento de um software para calibração de trenas utilizando visão computacional
Authors: Santana Carvalho Matheus , Grando Moreira Benjamin , Fischer Beckert Sueli
Published: September 2020

Metrology is responsible for the studies of aspects that involve themeasurements application, being a common area to engineering inthe search for continuous improvement and quality in the processand products. To approximate the machine processing, factory floor,and development of new applications, continuous technologicaldevelopment is demanded from the industrial sector and modernizationof its process. In this scenario, Metrology 4.0 uses technologiesin the traditional process ensuring the data quality, reliability, andsupports decision in real-time. For the innovation of the traditionalmodels of calibration, this paper introduces a software developmentto realize the comparation of measuring tape with a standard, usingComputer Vision, and compares the results of this process with thetraditional calibration methods.
Priorização de Atividades de Desenvolvimento de Software com uma Rede Neural Artificial
Authors: Junior Silveira Maicon , Luiz Marasca Andre , Marcon Marlon , Roberto Ortoncelli André
Published: September 2020

Prioritization of development activities in software companies iscommonly performed arbitrarily and subjectively, based solely onthe experience of the company’s employees. Aiming to contributeto the automation of this process, this paper presents a methodof automatic prioritization of software development activities, usingan algorithm that combines the use of a numerical regressionbasedArtificial Neural Network (RNA) with an ordering method.To validate the accuracy of the proposed method, a case study wasconducted, with real data from a software development company.The experiments allowed to evaluate the accuracy of the proposedmethod qualitatively and quantitatively, generating satisfactoryresults, which indicate the feasibility of implementing the proposedmethod in the target company of the case study.
We Can Do It: Uma Análise do Perfil Feminino de Computação no Mercado de Trabalho
Authors: Oliveira Walter Maynara , Tiemi Yada Natália , Iara Pegorini Jéssica , Pereira Silva Arielyn , Cristinne Correa Souza Alinne
Published: September 2020

Women have always struggled to hold their own in the employmentmarket. In computing area is not different as men are stillthe majority of professionals.Thus, this paper presents the resultsof a survey conducted throug female public in different computingorganizations. The survey aims to identify their satisfaction,fellings, challenges and perceptions about the role played in thisarea. The initial results are promising and indicate low participationof women in comparison as men, highlighting the importance of tocreate political to promote the women participation in the industryand courses of Computer.
Permanência e Êxito em Cursos de Computação: Uma Análise Quantitativa em Nível Técnico e Superior
Authors: Santos de Santana Thalia , Ferreira Lopes Alexandre , Bonacin Braga Ramayane , Honorato Braga Adriano
Published: September 2020

The permanence and success of students in computer-related courseshas a direct impact on the job market. Evasion is one of theobstacles in computing, thus corroborating the absence of qualifiedprofessionals in the face of high Brazilian demand. This paper aimsto analyze motivations for students to enter and stay in computerrelatedcourses, both at the technical and higher levels in a publiceducational institution. To this end, questionnaires were appliedto incoming students and to complete their respective courses in2019. The study presents a quantitative analysis related to objectivequestions, in order to contribute to the evaluation and verificationof the profile of students in the area, career prospects, and acting incomputing, as well as reflections on academia in vocational training.
On-board Compressing of Hyperspectral Images using CCSDS 123
Authors: Santos Douglas , Zeferino Cesar , Bezerra Eduardo , Dilillo Luigi , Melo Douglas
Published: September 2020

A satellite performing hyperspectral image processing requireshigh storage capacity and larger communication bandwidth. Compressionalgorithms, like the CCSDS 123, have been proposed tomitigate these requirements. Considering the constraints associatedto satellites, single-purpose processors have been developedto run these algorithms in Systems-on-Chip (SoC). In this work, weevaluate alternatives to integrate a CCSDS 123 compressor withan embedded processor based on RISC-V and ARM-based architectures.
Análise Comparativa de Redes Neurais Convolucionais no Reconhecimento de Cenas
Authors: Souza Victor , Silva Luan , Santos Adam , Araújo Leandro
Published: September 2020

This paper aims to compare the convolutional neural networks(CNNs): ResNet50, InceptionV3, and InceptionResNetV2 tested withand without pre-trained weights on the ImageNet database in orderto solve the scene recognition problem. The results showed that thepre-trained ResNet50 achieved the best performance with an averageaccuracy of 99.82% in training and 85.53% in the test, while theworst result was attributed to the ResNet50 without pre-training,with 88.76% and 71.66% of average accuracy in training and testing,respectively. The main contribution of this work is the direct comparisonbetween the CNNs widely applied in the literature, that is,to enable a better selection of the algorithms in the various scenerecognition applications.
Localização de Faltas em Linhas de Transmissão Através de Transformada de Wavelet Contínua, Pontos de Extremo e Teoria de Ondas Viajantes
Authors: Ferreira Lucas Fernando , Granemann Souza Everton , Das Dores do Nascimento Chiara
Published: September 2020

In this paper, we present a hybrid algorithm for electrical fault locationbased on the traveling wave theory. The temporal location offault points and the first reflected waves has been determined withcontinuous wavelet transforms (CWT) and concepts of extremevalues, respectively. The analyzed signals were created by the softwareATPDraw considering parameters of a real high voltage linesituated between the cities of Pelotas and Candiota, both in thestate of Rio Grande do Sul. Phase-to-ground faults for differenttransmission line lengths, incidence angles, and fault resistanceshave been analyzed. The results showed the efficiency of this typeof algorithm, exhibiting low relative errors, mainly for nonzeroincident angles.
Estratégia para Especificação de Game Design a Partir da Produção Textual em Sala de Aula
Authors: Tavares Fernandes Fernandes Kleber Tavares , Jacyntha Nunes Rodrigues Márcia , Henrique da Silva Aranha Eduardo , Gildene Lima de Souza Fernandes Gildene
Published: September 2020

Digitalgames are increasingly part of our daily lives and are alsoconsidered teaching and learning tools. However, its productionand documentation is a very complex task that requiresprogramming skills and knowledge of various areas. This hashampered the development of classroom games. On the otherhand, enthusiastic teachers and students have ventured into thisactivity as a way of learning school content and developingcomputational thinking in a more fun and meaningful way. Astrategy for creating games using natural language seems to be analternative to adopting game-based learning, developing computerthinking and writing skills. In this context, this article reports anexperience of specifying game design from textual production bystudents and teachersin the classroom.
Aprendendo Conceitos de Orientação a Objetos Usando as Ferramentas Scratch e Snap!
Authors: Da Silva Feitosa Samuel , Lunardi Comarella Rafaela
Published: September 2020

The object-oriented programming paradigm serves as the basisfor the most used programming languages nowadays, where largescale projects take advantage of certain characteristics, such ascode reuse, encapsulation, better organization on the system design,and consequently the improvement on the maintainabilityof software in general. These features are intrinsic in the objectorientedparadigm. However, preparing professionals to work assystems analysts or developers for projects based in this paradigmhas been shown difficult in academia, since it is necessary to understanda set of abstract concepts before starting the codification phase.In this context, this paper seeks to contribute with the study of twoprogramming tools – Scratch and Snap! – developed exclusivelyfor teaching computer programming, exploring them in order toteach object-oriented concepts in a visual and interactive mode,aiming to apply these concepts later in a traditional programminglanguage such as Java, C#, or C++.
Synthesis, Molecular Structure, HOMO-LUMO and Spectroscopic Investigation of (E)-1-(2,4-Dichloro-5-fluorophenyl)-3-(2,6-dichlorophenyl)prop-2-en-1-one: A DFT Based Computational Exploration
Authors: A. Adole Vishnu , H. Waghchaure Ravindra , B. Pawar Thansing , S. Jagdale Bapu , H. Kapadnis Kailas
Published: September 2020

In present study, the synthesis, molecular structure, HOMO-LUMO and spectroscopic investigation of (E)-1-(2,4-dichloro-5-fluorophenyl)-3-(2,6-dichlorophenyl)prop-2-en-1-one (CFPCP) is reported. The structure of the title compound was affirmed based on FTIR, 1H NMR & 13C NMR spectroscopic techniques. The computational examination has been performed by employing density functional theory (DFT) method at B3LYP/6-311G++(d,p) basis set. The geometry of the title molecule has been optimized and established at the same level of theory. The various structural and quantum chemical parameters have been investigated for the title molecule at the 6-311G++(d,p) basis set. To explore the electron distribution, Mulliken atomic charges and molecular electrostatic potential surface are discussed. Besides, vibrational assignments were made and the scaled frequencies have been compared with the experimental frequencies. For the investigation of the absorption wavelength, excitation energy and the oscillator strength TD-DFT method using B3LYP/6-311G++(d,p) basis set is used. Some thermochemical functions have also been investigated using harmonic vibrational frequencies.
Ciência da Informação e design de interação
Authors: Drumond Karine Coutinho , Dias Célia da Consolação
Published: September 2020

A resolução de problemas complexos da atual sociedade da informação exige uma abordagem multidisciplinar e atitude de colaboração entre áreas do conhecimento. O projeto de biblioteca digital é um destes problemas complexos, uma vez que combina aspectos tecnológicos, estruturais, de organização da informação e também de design. Partindo do pressuposto de interlocução entre a Ciência da Informação e do Design de Interação, este estudo visa responder a seguinte questão: “Que interlocuções e elos existem entre as duas áreas?” e "Que contribuições esta interlocução apresenta para projetos de bibliotecas digitais? A partir de uma pesquisa bibliográfica foram levantados possíveis elos e posteriormente criado um mapa conceitual a fim de descrever qualitativamente e identificar as relações e interlocuções que se estabelecem entre as duas áreas em projetos de bibliotecas digitais. Conclui-se que a interlocução acontece em duas dimensões principais: (1) dimensão histórica, uma vez que as áreas compartilham das influências histórias que as originaram e (2) dimensão de projeto: o projeto de biblioteca digital envolve conhecimentos tanto do ponto de vista de organização e representação da informação, questões centrais da CI, quando a necessidade de compreender as necessidades de usuários para projetar melhores interfaces e interações entre sistemas  e pessoas (questão central do design). Outros elos também são discutidos, como os estudos com usuários, a interação humano-computador, a cognição, a usabilidade e design centrado no usuário.
Características dos repositórios de dados científicos no Brasil
Authors: Paganine Lucas Nóbrega , Amaro Bianca
Published: September 2020

O objetivo do estudo em questão é observar e descrever os repositórios de dados científicos no Brasil. Para tanto Foi realizada uma análise descritiva iniciada a partir de um levantamento na plataforma re3data. Esse levantamento resultou nos nove repositórios de dados científicos do Brasil ali cadastrados. A análise foi orientada pela metodologia desenvolvida, adaptada a partir as características essenciais de um repositório científico apontadas em Rodrigues et al. (2010). As características foram adaptadas para a realidade dos dados de pesquisa e então organizadas em categorias (Armazenamento, Descrição e Apresentação dos itens). O baixo número de repositórios, não padronização e inconformidade com padrões internacionais estabelecidos são indicativos de que a realidade Brasileira ainda não está preparada adequadamente para lidar com as questões surgindo.