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Efficient Operation of an Yb:YAl 3 (BO 3 ) 4 Laser Passively Q-Switched With 2D MoS 2 Saturable Absorber J. Russ. Laser Res. (IF 0.993) Pub Date : 2021-01-16 Shuxuan Cao, Lisha Wang, Liang Dong, Wenjuan Han, Junhai Liu
We report on efficient passively Q-switched operation of an Yb:YAl3(BO3)4 laser with a 2D MoS2 acting as a saturable absorber, which is the first demonstration of passive Q-switching induced by 2D saturable absorbers in the Yb-ion crystal laser. An average output power of 1.52 W at 1039.6 nm is produced at a pulse repetition rate of 585 kHz, with optical-to-optical and slope efficiencies being 29.3%
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A new method for estimating the noise scale factor (NSF) and random errors in lidar observations Appl. Phys. B (IF 1.817) Pub Date : 2021-01-17 Ming Zhao, Tijian Wang, Hao Wu, Dongyang Nie, Mengmeng Li, Jingxian Liu, Min Xie, Shu Li, Bingliang Zhuang
The noise scale factor (NSF) is useful in calculating the random errors of lidar signals. A new method is proposed for estimating the NSF of lidar systems. Instead of measuring the solar background in the traditional method that demands special experiments or additional devices, the new method utilizes the molecular backscattered signal fragments of routinely observed lidar profiles to extract the
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Tunable multi-wavelength random distributed feedback fiber laser based on dual-pass MZI Appl. Phys. B (IF 1.817) Pub Date : 2021-01-16 Jingwei Liu, Zhengrong Tong, Weihua Zhang, Xutao Shi, Jiaxin Li
A tunable half-open cavity multi-wavelength erbium-doped random distributed feedback (RDFB) fiber laser is proposed and experimentally demonstrated. The backward Rayleigh scattering generated by inhomogeneous reflective in the 25-km-long single mode fiber is amplified by the 8-m-long pumped erbium-doped fiber (EDF). The dual-pass Mach–Zehnder interferometer (MZI) acts as the reflection mirror in the
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Fourier transform infrared (FTIR) spectroscopy of formaldoxime (CH2NOH) in the 450–3800 cm−1 region and its ν9 band J. Mol. Spectrosc. (IF 1.229) Pub Date : 2021-01-07 Q.Y. Wu; T.L. Tan
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Microwave Spectrum and Iodine Nuclear Quadrupole Coupling Constants of 1,1-Diiodoethane J. Mol. Spectrosc. (IF 1.229) Pub Date : 2021-01-15 Michael J. Carrillo; Wei Lin; Yasuki Endo
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Uncertainty analysis of CFD and performance prediction for an pumpjet propulsor Mod. Phys. Lett. B (IF 1.224) Pub Date : 2020-11-18 Chao Liu; Hongxun Chen; Zhengchuan Zhang; Zheng Ma
In order to reveal the operating characteristics of the pumpjet propulsor, standard k–𝜀, standard k–ω, RNG k–𝜀 and SST k–ω turbulence models were used to conduct steady calculation for the whole flow channels. By comparing the calculation results with experimental data, it was found that the calculation errors were very large in some operating conditions. Therefore, the uncertainty analysis was carried
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Node Trust: an effective method to detect non-overlapping community in social networks Mod. Phys. Lett. B (IF 1.224) Pub Date : 2020-12-07 Jinfang Sheng; Qiong Li; Bin Wang; Wanghao Guan; Jinying Dai; Jie Hu; Huaiyu Zuo
Social networks are made up of members in society and the social relationships established by the interaction between members. Community structure is an essential attribute of social networks. The question arises that how can we discover the community structure in the network to gain a deep understanding of its underlying structure and mine information from it? In this paper, we introduce a novel community
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Soliton solutions through optical fibers for quadratic–cubic nonlinear medium: A complex ansätze approach Optik (IF 2.187) Pub Date : 2021-01-12 S.A. Khuri; Abdul-Majid Wazwaz
A complex tanh-function method is presented for constructing optical soliton solutions for quadratic–cubic nonlinear medium. In addition, an ansätze is proposed for obtaining soliton solutions of the dimensionless form of the nonlinear Schrödinger’s equation that governs the propagation of solitons through optical fibers.
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Performance analysis of heterodyne confocal microscopy without a pinhole Opt. Commun. (IF 2.125) Pub Date : 2020-12-30 Hongzhou Dong; Chunping Yang; Mingwu Ao; Xianming Yang; Yong Liu
The specific structure of heterodyne detection system confocal microscopy (HDSCM) is presented in this paper. The theoretical derivation reveals that, HDSCM has the same transverse and axial resolutions as direct detection system confocal microscopy (DDSCM). However, HDSCM has several advantages over DDSCM. First, HDSCM does not need the conjugate pinhole which is necessary in DDSCM, thereby avoiding
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Novel approximate distribution of the sum of Gamma–Gamma variates with pointing errors and applications in MIMO FSO links Opt. Commun. (IF 2.125) Pub Date : 2021-01-12 Maoke Miao; Xiaofeng Li
In this work, a novel approximate closed-form probability density function for the sum of Gamma–Gamma random variates with Rayleigh pointing errors is derived by means of the well-known Jensen’s inequality. We employ the Kolmogorov–Smirnov goodness-of-fit statistical tests to verify the accuracy of the proposed approximation. The test results demonstrate that an exact distribution can be efficiently
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Experimental performance evaluation of weak turbulence channel models for FSO links Opt. Commun. (IF 2.125) Pub Date : 2021-01-11 Maged A. Esmail
Outdoor wireless communication is subject to several outdoor environment conditions. Among them, atmospheric turbulence which happens on a daily basis, introduces signal fading and degrades the system performance. Many channel models have been proposed in the literature to model the turbulence fading in free space optic (FSO) communication systems. In this work, we aim to evaluate the performance of
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A high extinction ratio plasmonic SU-8 waveguide polarizer Opt. Commun. (IF 2.125) Pub Date : 2021-01-15 Peyman Malekzadeh; Gholam-Mohammad Parsanasab; Hamed Nikbakht; Ezeddin Mohajerani; Majid Taghavi; Hamid Latifi
In this paper, a novel method has been proposed for increasing the extinction ratio of a plasmonic waveguide polarizer. Aluminum was coated in a 20-micron multi-strip pattern on the top of a SU-8 waveguide to excite the surface plasmons. The simulation and experimental results showed that the extinction ratio of the multi-strip polarizer was more than those of single-strip polarizers with the same
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Location method of Sagnac distributed optical fiber sensing system based on CNNs ensemble learning Opt. Laser Technol. (IF 3.233) Pub Date : 2021-01-15 Jidong Lv; Nian Fang; Chunhua Wang; Lutang Wang
Aiming at the location problem of high-pressure pipeline leakage, this paper proposes a method for predicting the disturbed position of a Sagnac distributed optical fiber sensing system based on ensemble learning of convolutional neural networks (CNNs). A Stacking ensemble method is used to combine two different CNN models to improve the stability and location accuracy of the disturbance position prediction
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Demonstration of GaN-based white LED grown on 4-inch patterned sapphire substrate by MOCVD Opt. Mater. (IF 2.779) Pub Date : 2021-01-15 Youhua Zhu; Xuan Liu; Mei Ge; Yi Li; Meiyu Wang
A blue light emitting diode (LED) chip has been facilely fabricated on a 4-inch patterned sapphire substrate based on an InGaN/GaN multiple quantum well structure, composed of a Ce3+ doped Yttrium Aluminum Garnet (YAG) yellow phosphor packaged into a white LED chip. The epitaxial growth, fabrication, and package process of the device have been briefly described; the structural properties and device
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1.4‐mJ High Energy Terahertz Radiation from Lithium Niobates Laser Photonics Rev. (IF 10.655) Pub Date : 2021-01-15 Baolong Zhang; Zhenzhe Ma; Jinglong Ma; Xiaojun Wu; Chen Ouyang; Deyin Kong; Tianshu Hong; Xuan Wang; Peidi Yang; Liming Chen; Yutong Li; Jie Zhang
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Programmable Controls to Scattering Properties of a Radiation Array Laser Photonics Rev. (IF 10.655) Pub Date : 2021-01-15 Si Jia Li; Yun Bo Li; Lei Zhang; Zhang Jie Luo; Bo Wen Han; Rui Qi Li; Xiang Yu Cao; Qiang Cheng; Tie Jun Cui
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Ultra‐Bright and Stable Pure Blue Light‐Emitting Diode from O, N Co‐Doped Carbon Dots Laser Photonics Rev. (IF 10.655) Pub Date : 2021-01-15 Xiao Wang; Yurong Ma; Qingyao Wu; Zhenzhen Wang; Yichen Tao; Yajie Zhao; Bo Wang; Jingjing Cao; Hui Wang; Xiaoqing Gu; Hui Huang; Si Li; Xiaoyong Wang; Fengrui Hu; Mingwang Shao; Liangsheng Liao; Tsun‐Kong Sham; Yang Liu; Zhenhui Kang
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Exceptional Points as Lasing Prethresholds Laser Photonics Rev. (IF 10.655) Pub Date : 2021-01-15 Alexander A. Zyablovsky; Ilya V. Doronin; Eugeny S. Andrianov; Alexander A. Pukhov; Yurii E. Lozovik; Alexey P. Vinogradov; Alexander A. Lisyansky
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Compact Dual‐Band Multi‐Focal Diffractive Lenses Laser Photonics Rev. (IF 10.655) Pub Date : 2021-01-15 Wesley A. Britton; Yuyao Chen; Fabrizio Sgrignuoli; Luca Dal Negro
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Single‐Particle Characterization by Elastic Light Scattering Laser Photonics Rev. (IF 10.655) Pub Date : 2021-01-15 Andrey V. Romanov; Maxim A. Yurkin
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Longitudinal fields and transverse rotations Nat. Photon. (IF 31.241) Pub Date : 2021-01-15 Filippo Cardano; Lorenzo Marrucci
Electromagnetic fields in light waves are mainly transverse to propagation direction but actually also have longitudinal components, which may give rise to unexpected optical phenomena involving the angular momentum of light, such as transverse spin and optical torques.
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The visual impact of augmented reality during an assembly task Displays (IF 1.738) Pub Date : 2021-01-10 Mathilde Drouot; Nathalie Le Bigot; Johanne Bolloc'h; Emmanuel Bricard; Jean-Louis de Bougrenet; Vincent Nourrit
Many studies have shown the benefits of augmented reality (AR) to improve manufacturing and control processes in industry. However, the presentation of AR content through optical see-through head-mounted displays may induce unnatural viewing conditions, which consequences on the user’s visual system have not been investigated yet. This study aimed at assessing whether using AR instructions to guide
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Development of a novel microfluidic device to study metal geochemistry in situ using X‐ray fluorescence microprobe spectroscopy J. Synchrotron Radiat. (IF 2.251) Pub Date : 2021-01-15 Michael A. Chen; Benjamin D. Kocar
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Integrated Fast-Sensing Triple-Voltage SPAD Quenching/Resetting Circuit for Increasing PDP IEEE Photon. Technol. Lett. (IF 2.451) Pub Date : 2020-12-14 Alija Dervić; Michael Hofbauer; Bernhard Goll; Horst Zimmermann
In this letter we present a fast triple voltage quenching circuit (TVQC) with an integrated $40~\mu \text{m}$ diameter single-photon avalanche diode (SPAD) in 0.35- $\mu \text{m}$ CMOS. By pre-biasing the switching MOSFETs the reaction time of the TVQC is kept small, leading to a total quenching time of only 1.4 ns of which 0.61 ns are actively quenched. This short reaction time reduces the avalanche
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Rate Adaptability Using LUT-Based Distribution Matching for Probabilistic Constellation Shaping IEEE Photon. Technol. Lett. (IF 2.451) Pub Date : 2020-12-18 Ricardo M. Ferreira; Fernando P. Guiomar; Pedro Pissarra; Marco A. Fernandes; Bruno T. Brandão; Adriano C. Messias; Daniel A. Formiga; Matheus M. Rodrigues; Tomaz de M. Vilela; Paulo P. Monteiro; Franscisco Rodrigues; António L. Teixeira; Jacklyn D. Reis
We investigate the flexibility of a LUT-based hierarchical DM for Probabilistic Constellation Shaping providing flexible net bit rates. Using a fixed parallelized input and output LUT-based architecture, including a flexible strategy to organize the input bits in each LUT, the proposed scheme shows an efficient performance in terms of rate loss vs. complexity, resulting in a DM solution to enable flexible
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Polymer Mode Selecting Switch Based on Cascaded MMI Couplers IEEE Photon. Technol. Lett. (IF 2.451) Pub Date : 2021-01-05 Yang Gao; Xiaoqiang Sun; Pengfei Li; Daming Zhang
A polymer waveguide mode selecting switch (MSS) composed of two cascaded MMI couplers is demonstrated. The MSS can switch different data channels over $\text{E}_{\mathbf {00}}$ and $\text{E}_{\mathbf {10}}$ modes. Polymer waveguide dimensions are optimized with beam propagation method. The simulated results indicate that the worst insertion loss is 5.5 dB at 1550 nm and the switching powers for $\text{E}_{\mathbf
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High-Brightness Nanosecond-Pulse Operation From Tapered-Ridge-Waveguide Lasers IEEE Photon. Technol. Lett. (IF 2.451) Pub Date : 2020-12-24 Anissa Zeghuzi; Heike Christopher; Andreas Klehr; Jan-Philipp Koester; Hans Wenzel; Andrea Knigge
Carrier-induced anti-guiding effects emerging at extremely high injection current densities under short-pulse operation necessitate lateral-waveguide design considerations, that differ from those required when continuous-wave operation is desired. Here, we investigate variations of the lateral index-guiding trench design to achieve an excellent brightness value of 27.4 Wmm −1 mrad −1 from tapered-ridge-waveguide
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Modal Bandwidth and Single-Mode VCSEL Transmission Capability Over Multimode Fibers IEEE Photon. Technol. Lett. (IF 2.451) Pub Date : 2021-01-04 Xin Chen; Kangmei Li; Jason E. Hurley; Jeffery S. Stone; Ming-Jun Li
Single-mode VCSELs have been demonstrated with great transmission capability over multimode fibers in the literature through restricted launch, which is beyond what is allowed by the effective modal bandwidth (EMB) defined for multimode transmission with the encircled flux launch condition. However, the impact of fiber index profile errors and their interactions with launch conditions have not been
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Three-Port Dual-Wavelength-Band Grating Coupler for WDM-PON Applications IEEE Photon. Technol. Lett. (IF 2.451) Pub Date : 2021-01-05 Lirong Cheng; Simei Mao; Caiyue Zhao; Xin Tu; Qian Li; H. Y. Fu
Grating coupling is a widely adopted strategy for coupling light into optical waveguides. While this versatile approach benefits both fabrication and alignment, grating couplers are particularly sensitive to both wavelength and polarization. These drawbacks hinder its application in integrated wavelength-division-multiplexing passive optical network (WDM-PON) transceivers, where widely separated wavelength
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Machine Learning Inspired Design of Complex-Shaped GaN Subwavelength Grating Reflectors IEEE Photon. J. (IF 2.833) Pub Date : 2020-12-30 Onoriode N. Ogidi-Ekoko; Wen Liang; Haotian Xue; Nelson Tansu
We present the machine learning inspired design of two types of GaN zero contrast subwavelength gratings (SWGs): a polynomial-shaped grating and, for reference, a conventional rectangular grating, using the differential evolution algorithm to optimize the designs for high broadband reflectivity and separately for large fabrication tolerance. Two wavelength regimes with 500 nm and 1.55 μm center wavelengths
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Calibration Method for Division-of-Focal-Plane Polarimeters Using Nonuniform Light IEEE Photon. J. (IF 2.833) Pub Date : 2020-12-29 Zhichao Ding; Chunsheng Sun; Hongwei Han; Liheng Ma; Yonggang Zhao
A method to calibrate the errors of polarization information measured by division-of-focal-plane polarimeters is demonstrated. The principle of this method is explained, and its feasibility is verified by theoretical simulation and experiment. The simulation and experimental results show that this method can obviously improve the measuring precision of polarization information, and compared with other
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Broadband Coupler Manipulation Through Particle Swarm Optimization for Arrayed Waveguide Grating Based Optical Coherence Tomography IEEE Photon. J. (IF 2.833) Pub Date : 2020-11-17 Benedictus Yohanes Bagus Widhianto; Yi-Ting Lu; Wei-Chien Chang; Shih-Hsiang Hsu
The state-of-the-art optical coherence technology (OCT) has its limitation, such as bulky and quite expensive. Miniaturization and integration of the OCT system are promising to get a compact, less costly, and more stable device. In this paper, we report the influence of optical power splitting on the sensitivity and axial resolution in spectral-domain OCT (SD-OCT) on silicon chip using tandem Mach-Zehnder
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Dual-Illumination Ultrasound/ Photoacoustic System for Cervical Cancer Imaging IEEE Photon. J. (IF 2.833) Pub Date : 2020-12-14 Maryam Basij; Andrei Karpiouk; Ira Winer; Stanislav Emelianov; Mohammad Mehrmohammadi
Early stage cancer detection technologies can provide functional information and potentially decrease the mortality rate caused by cervical cancer. In our previous work, a miniaturized ultrasound and photoacoustic endoscopic system has been developed to image the cervical tissue through the cervical canal to fulfills the need for a safe, low-cost, and high-resolution functional diagnostic system. However
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Multi-Spectral Optimization for Tissue Probing Using Machine Learning IEEE Photon. J. (IF 2.833) Pub Date : 2020-12-29 Yarden Tzabari Kelman; Hadas Lupa Yitzhak; Nadav Shabairou; Shahaf Finder; Zeev Zalevsky
An optical approach for pigmented lesions detection in human skin is presented. As differences between normal skin tissue and pigmentation tissue (and even a change in pigmentation development) can be detected by their optical properties, this paper presents a new, potentially noninvasive approach for skin cancer detection. Since each wavelength has different penetration depth into the tissue and different
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Securing Multiple Information Using Bio-Chaotic Keys IEEE Photon. J. (IF 2.833) Pub Date : 2020-12-29 Gaurav Verma; Wenqi He; Dajiang Lu; Meihua Liao; Xiang Peng; John Healy; John Sheridan
To advancement in security applications, for the first time, a bio-chaotic key generated from the emerging biometric trait “finger knuckle print (FKP)” has been proposed for data security and authentication. In the system, the feasibility to generate multiple keys from the single FKP image has been exploited to secure multiple information, which results in significant enhancement of the security strength
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Reservoir Computing Based on Two Parallel Reservoirs Under Identical Electrical Message Injection IEEE Photon. J. (IF 2.833) Pub Date : 2021-01-01 Dian-Zuo Yue; Zheng-Mao Wu; Yu-Shuang Hou; Chun-Xia Hu; Zai-Fu Jiang; Guang-Qiong Xia
In this work, we propose and numerically investigate a scheme for reservoir computing (RC) based on two parallel reservoirs under identical electrical message injection, in which two semiconductor lasers (SLs) under optical feedback are utilized as two parallel reservoirs. For simplifying the system, only one mask signal is employed in this scheme. After multiplying with input data, the masked information
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Origins Space Telescope: baseline mission concept J. Astron. Telesc. Instrum. Syst. (IF 1.585) Pub Date : 2021-01-01 David T. Leisawitz; Edward G. Amatucci; Lynn N. Allen; Jonathan W. Arenberg; Lee Armus; Cara Battersby; James M. Bauer; Bob G. Beaman; Raymond M. Bell Jr.; Porfirio Beltran; Dominic J. Benford; Edward Bergin; Jeffrey A. Bolognese; Charles M. Bradford; Damon C. Bradley; Denis Burgarella; Sean J. Carey; Ruth C. Carter; Danny Chi; Asantha Cooray; James A. Corsetti; Tom D'Asto; Elvire De Beck; Kevin L
The Origins Space Telescope will trace the history of our origins from the time dust and heavy elements permanently altered the cosmic landscape to present-day life. How did galaxies evolve from the earliest galactic systems to those found in the Universe today? How do habitable planets form? How common are life-bearing worlds? To answer these alluring questions, Origins will operate at mid- and far-infrared
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Architecture and performance of the KM3NeT front-end firmware J. Astron. Telesc. Instrum. Syst. (IF 1.585) Pub Date : 2021-01-01 Sebastiano Aiello; Arnauld Albert; Sergio Alves Garre; Zineb Aly; Fabrizio Ameli; Michel Andre; Giorgos Androulakis; Marco Anghinolfi; Mancia Anguita; Gisela Anton; Miquel Ardid; Julien Aublin; Christos Bagatelas; Giancarlo Barbarino; Bruny Baret; Suzan Basegmez du Pree; Anastasios Belias; Meriem Bendahman; Edward Berbee; Ad M. van den Berg; Vincent Bertin; Vincent van Beveren; Simone Biagi; Andrea
The KM3NeT infrastructure consists of two deep-sea neutrino telescopes being deployed in the Mediterranean Sea. The telescopes will detect extraterrestrial and atmospheric neutrinos by means of the incident photons induced by the passage of relativistic charged particles through the seawater as a consequence of a neutrino interaction. The telescopes are configured in a three-dimensional grid of digital
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A plasmonic lens based on coordinate transformation J. Mod. Optic. (IF 1.544) Pub Date : 2021-01-15 Qiongchan Gu; Yafei Li; Chunhai Hu; Jiangtao Lv; Yu Ying; Xiaoxiao Jiang; Guangyuan Si
With the development and maturity of nanofabrication technology, many nanostructures with specific electromagnetic characteristics and optical functions have been designed and demonstrated. Artificial materials with these special optical properties are known as metamaterials. In this paper, a metamaterial lens is proposed and characterized. After using the space transformation approach based on the
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Wide-range displacement sensor based on variable line-spacing grating and Y-type twin-core fibre J. Mod. Optic. (IF 1.544) Pub Date : 2021-01-15 Jiaqi Zhao; Wei He; Fanyong Meng; Guanghui Chen; Mingli Dong
In the paper, a wide range displacement sensor based on the variable line-spacing (VLS) grating was proposed and its displacement characteristics at different temperature environments were measured. The VLS grating was inscribed by electron beam lithography method, and the sensor mechanical structure was designed and fabricated. A broadband light was irradiated to the VLS grating though a twin-core
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Investigation on Mechanical Properties of GH4720Li at High Strain Rates at Wider Temperature Range Int. J. Photoenergy (IF 1.88) Pub Date : 2021-01-15 Jie Chen; Haifeng Zhang; Yunlong Zhang; Hongtao Zhang; Qingxiang Yang; Longhai Ye
In this paper, the dynamic mechanical properties of GH4720Li nickel-base alloy under a large temperature range and high and low strain rates were studied by the hot compression test. The difference of mechanical properties of GH4720Li alloy under high and low strain rates was analyzed from the perspective of microstructure. The hot compression test experimental results showed that the true stress of
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Self-Focused Thermal Emission and Holography Realized by Mesoscopic Thermal Emitters ACS Photonics (IF 6.864) Pub Date : 2021-01-15 Ming Zhou; Erfan Khoram; Dianjing Liu; Boyuan Liu; Shanhui Fan; Michelle L. Povinelli; Zongfu Yu
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Broadband Liquid Crystal Tunable Metasurfaces in the Visible: Liquid Crystal Inhomogeneities Across the Metasurface Parameter Space ACS Photonics (IF 6.864) Pub Date : 2021-01-15 James A. Dolan; Haogang Cai; Lily Delalande; Xiao Li; Alex B. F. Martinson; Juan J. de Pablo; Daniel López; Paul F. Nealey
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Comment on “Upconversion-Assisted Dual-Band Luminescent Solar Concentrator Coupled for High Power Conversion Efficiency Photovoltaic Systems” ACS Photonics (IF 6.864) Pub Date : 2021-01-15 Chenchen Yang; Richard R. Lunt
In the recent article by Ha et al., a triplet–triplet annihilation (TTA)-based photon up-conversion (UC) mechanism was combined with a downshifting (DS) process to demonstrate a selective-harvesting semitransparent luminescent solar concentrator (LSC).(1) Both ultraviolet (UV) and red light are absorbed and converted into green light by downshifting and triplet–triplet annihilation up-conversion luminescence
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Boosting Strong Coupling in a Hybrid WSe2 Monolayer–Anapole–Plasmon System ACS Photonics (IF 6.864) Pub Date : 2021-01-14 Khalil As’ham; Ibrahim Al-Ani; Lujun Huang; Andrey E. Miroshnichenko; Haroldo T. Hattori
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Photonic Microresonators Created by Slow Optical Cooking ACS Photonics (IF 6.864) Pub Date : 2021-01-14 Gabriella Gardosi; Brian J. Mangan; Gabe S. Puc; Michael Sumetsky
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Framework for Coverage Path Planning Optimization Based on Point Cloud for Structural Inspection Sensors (IF 3.275) Pub Date : 2021-01-15 Iago Z. Biundini; Milena F. Pinto; Aurelio G. Melo; Andre L. M. Marcato; Leonardo M. Honório; Maria J. R. Aguiar
Different practical applications have emerged in the last few years, requiring periodic and detailed inspections to verify possible structural changes. Inspections using Unmanned Aerial Vehicles (UAVs) should minimize flight time due to battery time restrictions and identify the terrain’s topographic features. In this sense, Coverage Path Planning (CPP) aims at finding the best path to coverage of
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nduction of Neural Plasticity Using a Low-Cost Open Source Brain-Computer Interface and a 3D-Printed Wrist Exoskeleton Sensors (IF 3.275) Pub Date : 2021-01-15 Mads Jochumsen; Taha Al Muhammadee Janjua; Juan Carlos Arceo; Jimmy Lauber; Emilie Simoneau Buessinger; Rasmus Leck Kæseler
Brain–computer interfaces (BCIs) have been proven to be useful for stroke rehabilitation, but there are a number of factors that impede the use of this technology in rehabilitation clinics and in home-use, the major factors including the usability and costs of the BCI system. The aims of this study were to develop a cheap 3D-printed wrist exoskeleton that can be controlled by a cheap open source BCI
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ull and Aerial Holonomic Propulsion System Design for Optimal Underwater Sensor Positioning in Autonomous Surface Vessels Sensors (IF 3.275) Pub Date : 2021-01-15 Bruno A. Regina; Leonardo M. Honório; Antônio A. N. Pancoti; Mathaus F. Silva; Murillo F. Santos; Vitor M. L. Lopes; Accacio F. Santos Neto; Luis G. F. Westin
Acoustic Doppler Current Profiler (ADCP) sensors measure water inflows and are essential to evaluate the Flow Curve (FC) of rivers. The FC is used to calibrate hydrological models responsible for planning the electrical dispatch of all power plants in several countries. Therefore, errors in those measures propagate to the final energy cost evaluation. One problem regarding this sensor is its positioning
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ingular Value Decomposition for Removal of Cardiac Interference from Trunk Electromyogram Sensors (IF 3.275) Pub Date : 2021-01-15 Elisabetta Peri; Lin Xu; Christian Ciccarelli; Nele L. Vandenbussche; Hongji Xu; Xi Long; Sebastiaan Overeem; Johannes P. van Dijk; Massimo Mischi
A new algorithm based on singular value decomposition (SVD) to remove cardiac contamination from trunk electromyography (EMG) is proposed. Its performance is compared to currently available algorithms at different signal-to-noise ratios (SNRs). The algorithm is applied on individual channels. An experimental calibration curve to adjust the number of SVD components to the SNR (0–20 dB) is proposed.
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erformance Analysis in Olympic Sailors of the Formula Kite Class Using GPS Sensors (IF 3.275) Pub Date : 2021-01-15 Israel Caraballo; José Luis González-Montesinos; Francisco Casado-Rodríguez; José V. Gutierrez-Manzanedo
Formula Kite is an Olympic sport that mainly differs from other kitesurfing modalities for the use of a hydrofoil. It is considered an extreme sport due to the great technical ability required. Regarding performance, the variables that determine performance in a real competition situation have not been studied, and even less so with Olympic sailors. Therefore, the objective of this study was to determine
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rain-Inspired Data Transmission in Dense Wireless Network Sensors (IF 3.275) Pub Date : 2021-01-15 Łukasz Kułacz; Adrian Kliks
In this paper, the authors investigate the innovative concept of a dense wireless network supported by additional functionalities inspired by the human nervous system. The nervous system controls the entire human body due to reliable and energetically effective signal transmission. Among the structure and modes of operation of such an ultra-dense network of neurons and glial cells, the authors selected
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heoretical Studies and Implementation on the Temporary Data Storage Method for Cone Penetration Test Sensors (IF 3.275) Pub Date : 2021-01-15 Yanming Li; Yuheng Shen; Xiaoquan Wang; Sifeng Li; Tonglu Li; Quanli Zhao
The traditional cone penetration test system uses cable to transmit data; as the probe goes deeper into the ground, the length of the cable will become longer. This makes the installation of the test equipment more complicated, and excessively long cables cause signal distortion and seriously affect data accuracy. To simplify the experimental equipment and improve the accuracy of data acquisition,
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Novel Method for Determining Angular Speed and Acceleration Using Sin-Cos Encoders Sensors (IF 3.275) Pub Date : 2021-01-15 Manuel Alcázar Vargas; Javier Pérez Fernández; Juan M. Velasco García; Juan A. Cabrera Carrillo; Juan J. Castillo Aguilar
The performance of vehicle safety systems depends very much on the accuracy of the signals coming from vehicle sensors. Among them, the wheel speed is of vital importance. This paper describes a new method to obtain the wheel speed by using Sin-Cos encoders. The methodology is based on the use of the Savitzky–Golay filters to optimally determine the coefficients of the polynomials that best fit the
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Soft Exoskeleton Glove for Hand Bilateral Training via Surface EMG Sensors (IF 3.275) Pub Date : 2021-01-15 Yumiao Chen; Zhongliang Yang; Yangliang Wen
Traditional rigid exoskeletons can be challenging to the comfort of wearers and can have large pressure, which can even alter natural hand motion patterns. In this paper, we propose a low-cost soft exoskeleton glove (SExoG) system driven by surface electromyography (sEMG) signals from non-paretic hand for bilateral training. A customization method of geometrical parameters of soft actuators was presented
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cular Phantom-Based Feasibility Study of an Early Diagnosis Device for Glaucoma Sensors (IF 3.275) Pub Date : 2021-01-15 Marie-Valérie Moreno; Cloé Houriet; Pierre-Alain Grounauer
Glaucoma causes total or partial loss of vision in 10% of people over the age of 70, increasing their fragility and isolation. It is characterised by the destruction of the optic nerve fibres, which may result from excessively high intraocular pressure as well as other phenomena. Diagnosis is currently reached through a combination of several checks, mainly of the eyes’ fundus, tonometry and gonioscopy
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inite Element Modelling of Bandgap Engineered Graphene FET with the Application in Sensing Methanethiol Biomarker Sensors (IF 3.275) Pub Date : 2021-01-15 Paramjot Singh; Parsoua Abedini Sohi; Mojtaba Kahrizi
In this work, we have designed and simulated a graphene field effect transistor (GFET) with the purpose of developing a sensitive biosensor for methanethiol, a biomarker for bacterial infections. The surface of a graphene layer is functionalized by manipulation of its surface structure and is used as the channel of the GFET. Two methods, doping the crystal structure of graphene and decorating the surface
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ault Detection and Identification Method for Quadcopter Based on Airframe Vibration Signals Sensors (IF 3.275) Pub Date : 2021-01-15 Xiaomin Zhang; Zhiyao Zhao; Zhaoyang Wang; Xiaoyi Wang
Quadcopters are widely used in a variety of military and civilian mission scenarios. Real-time online detection of the abnormal state of the quadcopter is vital to the safety of aircraft. Existing data-driven fault detection methods generally usually require numerous sensors to collect data. However, quadcopter airframe space is limited. A large number of sensors cannot be loaded, meaning that it is
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yperspectral Imaging (HSI) Technology for the Non-Destructive Freshness Assessment of Pearl Gentian Grouper under Different Storage Conditions Sensors (IF 3.275) Pub Date : 2021-01-15 Zhuoyi Chen; Qingping Wang; Hui Zhang; Pengcheng Nie
This study used visible/near-infrared hyperspectral imaging (HSI) technology combined with chemometric methods to assess the freshness of pearl gentian grouper. The partial least square discrimination analysis (PLS-DA) and competitive adaptive reweighted sampling-PLS-DA (CARS-PLS-DA) models were used to classify fresh, refrigerated, and frozen–thawed fish. The PLS-DA model achieved better classification
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on-Invasive Method to Detect Infection with Mycobacterium tuberculosis Complex in Wild Boar by Measurement of Volatile Organic Compounds Obtained from Feces with an Electronic Nose System Sensors (IF 3.275) Pub Date : 2021-01-15 Kelvin de Jesús Beleño-Sáenz; Juan Martín Cáceres-Tarazona; Pauline Nol; Aylen Lisset Jaimes-Mogollón; Oscar Eduardo Gualdrón-Guerrero; Cristhian Manuel Durán-Acevedo; Jose Angel Barasona; Joaquin Vicente; María José Torres; Tesfalem Geremariam Welearegay; Lars Österlund; Jack Rhyan; Radu Ionescu
More effective methods to detect bovine tuberculosis, caused by Mycobacterium bovis, in wildlife, is of paramount importance for preventing disease spread to other wild animals, livestock, and human beings. In this study, we analyzed the volatile organic compounds emitted by fecal samples collected from free-ranging wild boar captured in Doñana National Park, Spain, with an electronic nose system based
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