Article Chemistry, Physical
Optical saturable absorption of conformal graphene directly synthesized on nonlinear device surfaces
Sofiya Karankova, Oleksiy Kovalchuk, Sungjae Lee, Bowon Ryu, Siam Uddin, Hyowon Moon, Yong-Won Song
Summary: We investigate the optical nonlinearities of transfer-free graphene synthesized by the atomic carbon spraying (ACS) method, and compare it with graphene prepared by chemical vapor deposition (CVD) and reduced graphene oxides (rGOs) by electro-spraying (ES). The three nanocrystal structures are characterized by transmission electron microscopy and Raman analysis. The nonlinear properties of ACS graphene are found to be comparable to CVD graphene and significantly higher than ES rGOs, demonstrating the unimpaired nonlinear properties of graphene prepared by the ACS method. The saturation intensity of ACS graphene is measured to be 32.14 MW cm(-2), an order of magnitude lower than conventional ES rGOs.
APPLIED SURFACE SCIENCE (2023)
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Article Optics
Statistical study on rogue waves in Gaussian light field in saturated nonlinear media
Ziyang Chen, Fuqiang Li, Cibo Lou
Summary: The experiment observed spatial rogue waves generated by a wide Gaussian beam in a saturated nonlinear system, with the probability of occurrence related to the evolution of the beam to the critical state of filament splitting, voltage fluctuations, and nonlinear breathing phenomenon. The statistics of rogue waves satisfy a long-tailed L-shaped distribution, indicating that the presence of high-frequency components and aggregation of low-frequency components are prerequisites for extreme events to occur.
CHINESE OPTICS LETTERS (2022)
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Article Materials Science, Multidisciplinary
Effects of reduced graphene oxide on nonlinear absorption and optical limiting properties of spin coated aluminium doped zinc oxide thin films
V. G. Sreeja, P. Hajara, R. Reshmi, E. Anila
Summary: This study investigated the nonlinear absorption and optical limiting properties of reduced graphene oxide (rGO) incorporated aluminum doped zinc oxide (AZO) composite thin films. The results showed enhanced nonlinear absorption coefficient in the AZO:rGO composites compared to AZO thin film, attributed to two photon absorption and reverse saturable absorption. The composite material exhibited lower optical limiting threshold value, making it a promising optical limiter for use in sensitive photonic devices.
THIN SOLID FILMS (2021)
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Article Chemistry, Multidisciplinary
Tunable optical and semiconducting properties of eco-friendly-prepared reduced graphene oxide
Talia Tene, Yuliana Jimenez-Gaona, Diana Katherine Campoverde-Santos, Yesenia Cevallos, Matteo La Pietra, Cristian Vacacela Gomez, Andrea Scarcello, Salvatore Straface, Lorenzo S. Caputi, Stefano Bellucci
Summary: This study investigates the tunability of reduced graphene oxide (rGO) and its potential use in energy conversion and optoelectronic devices. The researchers found that controlling the reduction time and temperature can customize the optical bandgap of rGO. They also discovered that rGO has superior absorption properties compared to dispersions of exfoliated graphene and graphene oxide. The findings have significant implications for future semiconductor development and design.
FRONTIERS IN CHEMISTRY (2023)
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Article Nanoscience & Nanotechnology
Liquid Metal@Reduced Graphene Oxide Composite Putty for Microwave Absorption
Lichang Wang, Li Huang, Xihua Wang, Ye Yuan
Summary: The development of radar technology has increased the need for radar stealth capability in warplanes. This study proposes a strategy to create a plastic microwave-absorbing putty by encapsulating liquid metal with reduced graphene oxide (rGO). The putty, formed through electrostatic self-assembly, shows excellent properties and achieves a minimum reflection (RLmin) of -58.86 dB at 8.93 GHz with a small thickness of 3.57 mm. This composite putty can be a potential candidate for reducing the radar cross section of airplanes.
ACS APPLIED NANO MATERIALS (2023)
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Article Optics
Understanding the conditions for the optimum nonlinear refraction of epsilon-near-zero films based on transparent conducting oxides
Hosein Ghobadi, Herman L. Offerhaus, Jose A. Alvarez-Chavez, Monica Morales-Masis, Israel De Leon
Summary: Transparent Conducting Oxides (TCOs) in the Epsilon-Near-Zero (ENZ) spectral region exhibit a large and ultrafast intensity-dependent refractive index, which is highly dependent on material properties and measurement conditions. This study demonstrates that extensive nonlinear optical measurements can be avoided by analyzing the material's linear optical response. By considering thickness-dependent material parameters, the impact on absorption and field intensity enhancement under different measurement conditions can be determined, allowing for optimization of the nonlinear response. Experimental measurements of Indium-Zirconium Oxide (IZrO) thin films with varying thicknesses confirm the agreement between experiment and theory, and show that film thickness and excitation angle can be adjusted simultaneously for optimizing the nonlinear optical response, enabling flexible design of highly nonlinear TCO-based optical devices.
OPTICS EXPRESS (2023)
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Article Materials Science, Multidisciplinary
Covalently linked graphene oxide-transition metal disulfide quantum dots nanocomposites featuring enhanced nonlinear optical absorption
Zhiyuan Wei, Zihao Guan, Fang Liu, Yanyan Xue, Naying Shan, Yang Zhao, Lulu Fu, Zhipeng Huang, Jun Xu, Mark G. Humphrey, Chi Zhang
Summary: This study constructed covalently linked nanocomposites composed of graphene oxide (GO) and MoS2, WS2 quantum dots (QDs). These nanocomposites demonstrated significant fluorescence quenching and superior two-photon absorption (TPA) responses, indicating their promising potential in optical limiting applications and ultrafast photonic devices.
MATERIALS TODAY PHYSICS (2023)
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Article Engineering, Electrical & Electronic
Optimizing the Kerr Nonlinear Optical Performance of Silicon Waveguides Integrated With 2D Graphene Oxide Films
Yuning Zhang, Jiayang Wu, Yang Qu, Linnan Jia, Baohua Jia, David J. Moss
Summary: Theoretical study on the Kerr nonlinear optical performance of silicon nanowire waveguides integrated with 2D layered graphene oxide films reveals significant enhancement of Kerr nonlinearity. Optimization of waveguide geometry and GO film thickness can increase the effective nonlinear parameter and FOM. By evaluating the spectral broadening induced by self-phase modulation, the trade-off between enhancing Kerr nonlinearity and minimizing loss is examined.
JOURNAL OF LIGHTWAVE TECHNOLOGY (2021)
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Article Materials Science, Multidisciplinary
Nonlinear variable band gap of reduced graphene oxide examined by in-situ absorption spectrum and light response
Lirong Gong, Changlong Cai, Haifeng Liang, Yuting Huang, Yinli Zhang, Tiantian Jia, Ben Tu, Weiguo Liu, Tian Liu
Summary: This study investigates the relationship between oxygen group and band gap in reduced graphene oxide (RGO). The results show that the reduction of oxygen group strongly depends on the annealing temperature, leading to a nonlinear variable band gap. The nonlinear photoelectric response of RGO light detective device further confirms this trend. Our work provides a pathway for the application of RGO in electronic fields.
DIAMOND AND RELATED MATERIALS (2022)
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Article Chemistry, Physical
Superhydrophobic nanocomposites of erbium oxide and reduced graphene oxide for high-performance microwave absorption
Ling Li, Shanshan Lian, Jianfeng Tang, Shu Chen, Rui Guo, Shuaijun Pan, Chang Peng
Summary: Engineering of erbium oxide-reduced graphene oxide composites with morphology-controlled chrysanthemum-like structures enables effective and durable absorption of electromagnetic microwaves in acidic or alkaline environments, offering promising applications in harsh outdoor conditions.
JOURNAL OF COLLOID AND INTERFACE SCIENCE (2022)
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Article Crystallography
Electrical and Optical Characterization of Graphene Oxide and Reduced Graphene Oxide Thin Films
Grazia Giuseppina Politano, Carlo Versace
Summary: This study investigates the electrical and optical characteristics of GO and RGO films by performing electric impedance measurements, optical microscopy, and variable angle spectroscopic ellipsometry tests. The results show that the electric resistance of RGO films is significantly lower than that of GO films. Additionally, thermal annealing enhances the optical conductivity and absorption coefficient of GO films.
CRYSTALS (2022)
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Article Optics
Impact of nonlinear electron transport model on character of light propagation in photorefractive semiconductors
Andrzej Ziolkowski, Ewa Weinert-Raczka
Summary: The paper analyzes the propagation of nonlinear light in photorefractive gallium arsenide and presents two methods of nonlinear electron transport modeling. The study shows that self-trapping of optical beams and bending of beam trajectories are possible in different models. The impact of oscillations in charge carrier domains on light propagation is also examined.
OPTICS AND LASER TECHNOLOGY (2022)
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Article Materials Science, Multidisciplinary
Optical limiting behavior of metal (Mn, W) oxides decorated nitrogen-doped reduced graphene oxide nanocomposites stimulated by two-photon absorption
D. Mary Deena, A. Dhanusha, T. C. Sabari Girisun, A. Philominal
Summary: The nonlinear absorption and optical limiting properties of rGO/MnO2, NrGO/MnO2 and NrGO/MnO2/WO3 nanostructures induced by nanopulsed Nd:YAG green laser were investigated for the first time using single beam Z-scan experiment. It was found that MnO2 decorated NrGO had a higher two-photon absorption coefficient and the lowest optical limiting threshold.
OPTICAL MATERIALS (2023)
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Article Engineering, Multidisciplinary
Reduced graphene oxide loaded with rich defects CoO/Co3O4 for broadband microwave absorption
Zizhao Ding, Zuojuan Du, Yu Liu, Qiancheng Zhang, Zixiang Zhao, Mingming Hou, Xiangyu Wang, Yusuf Abdullahi Hassan, Xiaozhong Huang, Jianjing Yue, Ailiang Chen, Yutian Ma, Sujun Lu
Summary: In this study, a magnetic CoxOy/RGO composite material with wideband microwave absorbing capability was prepared using a simple hydrothermal and pyrolysis method. The optimum pyrolysis temperature was determined by analyzing the electromagnetic parameters, attenuation constants, and impedance matching of the composites at different temperatures. After heat treatment at 500 degrees C, the sample exhibited a minimum reflection loss of -67.2 dB and an effective absorbing bandwidth of 9.1 GHz, covering the whole X, Ku, and K bands. The excellent microwave absorption performance is attributed to the structure of cobalt nanospheres adjusting the effective dielectric constant of the material and the presence of CoO promoting dipole polarization and interfacial polarization process to improve impedance matching, thereby achieving a wider absorption effect.
COMPOSITES PART B-ENGINEERING (2023)
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Article Engineering, Electrical & Electronic
The Tailored Saturated-Unsaturated Defect Modes Obtained by Nonlinear Threshold Light in Graphene-Based Hyperbolic Metamaterial
Yu Ma, Yi Xu, Hai-Feng Zhang
Summary: Tailored saturated-unsaturated defect modes are achieved in the proposed graphene-based hyperbolic metamaterials in the mid-infrared and near-infrared bands using threshold light. Saturated absorption in graphene is found to be transparent and lossless. The incident angle, number of periods, and chemical potential of graphene are considered, and the results show that the greater saturated defect mode is observed at smaller incident angles and larger periods. The unsaturated defect mode is not affected by the incident angle but can be controlled by the chemical potential. In addition, two novel threshold lights producing bistable graphene absorption are analyzed using nonlinear Kerr materials, with potential applications in nonlinear optical switches and logic devices.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS (2023)
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Article Mathematics, Applied
Analysis and improvement of Boolean chaos robustness to noise
HaiFang Liu, YunCai Wang, GuoDong Zhang, JianGuo Zhang
Summary: This article analyzes the influences of noise on autonomous Boolean networks chaotic system, revealing that noise may lead to chaos instability and transform chaotic outputs into periodic outputs. Furthermore, the impacts of noise on Boolean chaotic systems are two-sided, and increasing the number of nonlinear elements in the chaotic system can improve robustness to noise.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION (2022)
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Article Computer Science, Theory & Methods
Improvement of Min-Entropy Evaluation Based on Pruning and Quantized Deep Neural Network
Haohao Li, Jianguo Zhang, Zhihu Li, Juan Liu, Yuncai Wang
Summary: In the field of information security, the unpredictability of random numbers is crucial for the security of cryptographic systems. Statistical-based methods for random number security assessment can only detect obvious flaws in random sequences. In recent years, machine learning-based techniques such as deep neural networks have shown superior performance in random number security. However, these deep learning models often have high complexity and storage requirements.
IEEE TRANSACTIONS ON INFORMATION FORENSICS AND SECURITY (2023)
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Article Computer Science, Artificial Intelligence
Secure Communication via Chaotic Synchronization Based on Reservoir Computing
Jiayue Liu, Jianguo Zhang, Yuncai Wang
Summary: This article proposes a chaotic synchronization and communication system based on reservoir computing (RC), where the trained RC acts as the receiver, highly synchronized with the emitter. A cross-prediction algorithm is proposed to weaken the accumulation effect of prediction synchronization error and facilitate long-term communication. The simulation results show that high synchronization and low bit error rate can be achieved under appropriate conditions.
IEEE TRANSACTIONS ON NEURAL NETWORKS AND LEARNING SYSTEMS (2022)
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Article Materials Science, Multidisciplinary
Fabrication and luminescence properties of Al2O3-Ce:LuAG composite phosphor ceramics for solid-state laser lighting
Yanbin Wang, Xinyou Huang, Ziqiu Cheng, Penghui Chen, Yuyang Chen, Junhao Ye, Haohong Chen, Zhenzhen Zhou, Denis Yu Kosyanov, Jiang Li
Summary: Uniform Al2O3-Ce:LuAG composite phosphor ceramics (CPCs) with excellent luminescent properties and thermal stability have been successfully synthesized in this study, showing great potential for application in solid-state laser lighting.
OPTICAL MATERIALS (2024)
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Article Materials Science, Multidisciplinary
Effect of laser irradiance on opto-electrical properties of PVA embedded graphene copper ferrite nanocomposite strips
Syed Muhammad Ali Zaidi, Mazhar Ali Kalyar, Zulfiqar Ali Raza, Aayesha Shoukat, Rubaila Waseem, Muhammad Aslam
Summary: Polyvinyl alcohol (PVA) nanocomposite strips embedded with graphene nanosheets and copper-ferrite nanoparticles were synthesized using solution casting technique. Laser pulse irradiations were then applied to modify the structural, optical, and electrical properties of the strips, showing potential for optoelectronic devices.
OPTICAL MATERIALS (2024)
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Article Materials Science, Multidisciplinary
Angular non-critical phase-matching second harmonic generation with the Ba3(ZnB5O10)PO4 crystal
Yunru Chen, Jialing Wu, Jiajia Wang, Shihui Ma, Hongwei Yu
Summary: This paper investigates the angular non-critical phase-matching second-harmonic-generation properties of Ba3(ZnB5O10)PO4 crystal and explores its potential applications in the output spectral regions.
OPTICAL MATERIALS (2024)
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Article Materials Science, Multidisciplinary
Two noncentrosymmetric alkali metal phosphates MZnPO4 (M = Rb, Cs) with honeycomb-like structures
Qun Jing, Menglin Zhu, Lu Li, Xu Ji, Haiming Duan, Henglei Chen, Ming-Hsien Lee
Summary: The paper introduces two new nonlinear optical materials, MZnPO4 (M = Rb, Cs), synthesized by cation substitution. These materials exhibit a honeycomb-like structure and show mild SHG responses with short absorption edges. The thermal properties, IR spectra, and theoretical calculations of the materials are also discussed.
OPTICAL MATERIALS (2024)
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Article Materials Science, Multidisciplinary
Evaluation of microscale crystallinity modification induced by laser writing on Mn3O4 thin films
Camila Ianhez-Pereira, Akhil Kuriakose, Ariano De Giovanni Rodrigues, Ana Luiza Costa Silva, Ottavia Jedrkiewicz, Monica Bollani, Marcio Peron Franco de Godoy
Summary: This study aims to evaluate the crystalline changes induced by ultrafast laser micromachining on manganese oxide thin films using micro-Raman spectroscopy. The results show that laser-writing is effective in locally modifying low-crystallinity films and increasing crystallite sizes, highlighting an interesting approach to evaluate laser-induced structural modifications on metal oxide thin films.
OPTICAL MATERIALS (2024)
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Article Materials Science, Multidisciplinary
Studies of luminescence traits and Judd-Ofelt analysis of Sm3+ activated oxyfluoride glasses
Kamal Bansal, Neeraj Kumar Mishra, Ibrahim Abdullahi, Param Jeet Singh, Mohit Tyagi, Sukhpal Singh
Summary: A novel Sm3+ activated oxyfluoride glass was synthesized and its structure and properties were analyzed. The glass showed potential applications in lasers, optical temperature sensing, and high-energy scintillators.
OPTICAL MATERIALS (2024)
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Article Materials Science, Multidisciplinary
Design and optimization of the performance of self-powered Sb2S3 photodetector by SCAPS-1D simulation and potential application in imaging
Xingjian Wang, Zhixu Wu, Jiawei Zhu, Yubin Kang, Mengqiang Cai, Yong Xia, Hui Deng
Summary: Antimony sulfide (Sb2S3) has been investigated as a promising material for visible light photodetectors due to its non-toxicity, stability, and high absorption coefficient. In this study, we systematically explored the impact of key parameters on the performance of Sb2S3 devices using simulation and successfully fabricated self-powered photodetectors with high responsivity and specific detectivity. Furthermore, we demonstrated the application of the Sb2S3 detector in a scanning imaging system, showcasing its potential for developing new types of visible light detectors and imaging systems.
OPTICAL MATERIALS (2024)
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Article Materials Science, Multidisciplinary
Gamma-irradiated fluorophosphate glasses doped with various transition metals: A spectroscopic study
O. I. Sallam, R. M. Ahmed
Summary: The 20NaF-60P2O5-20Na2O fluorophosphate glass systems doped with 3 wt% of CoO and NiO were investigated for their optical parameters before and after gamma irradiation. The presence of defects within the glass network and the addition of transition metals were found to affect the properties of the composites. After irradiation, a red shift was observed in the dissipation factor spectrum. The energy lost at the surface of the composites was larger than the energy lost within the constituent materials. All investigated composites showed insulating behavior and exhibited increased nonlinear optical parameters after irradiation, with the CoO-doped composite showing the highest values.
OPTICAL MATERIALS (2024)
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Article Materials Science, Multidisciplinary
Down-conversion emission of Er3+doped sulfophosphate glass: The role of TiO2 and Ag nanoparticles co-embedment
Fahimeh Ahmadi, Zeinab Ebrahimpour, Asghar Asgari, Bao Van
Summary: In this study, Er3+-doped sulfophosphate glasses containing titanium nanoparticles (TiO2 NPs) and different concentrations of silver nanoparticles (AgNPs) were synthesized. The impact of AgNPs on the physical and structural characteristics, optical absorption and emission features, and photocatalytic activity of the glasses were investigated. The results showed that the addition of AgNPs enhanced the emission intensity of the glasses, with the system containing 0.04 mol% of AgNPs exhibiting optimal performance. Furthermore, the presence of AgNPs and TiO2 NPs in the glass matrix positively affected the photocatalytic performance.
OPTICAL MATERIALS (2024)
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Article Materials Science, Multidisciplinary
Blue LD-pumped continuous wave a-cut Pr3+:LiYF4 near-infrared laser at 868 nm
Zhuang Li, Rongfei Huang, Wei Yuan, Shaoqiang Zheng, Wenlu Liao, Huiying Xu, Zhiping Cai
Summary: This study reports the first realization of an 868 nm Pr:YLF laser pumped by an InGaN blue laser diode. The laser achieved a maximum power of 641 mW with stable output and good beam quality. The experimental results were in agreement with theoretical simulations.
OPTICAL MATERIALS (2024)
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Article Materials Science, Multidisciplinary
Direct detection of dopamine using zinc oxide nanowire-based surface plasmon resonance sensor
Bhishma Karki, Youssef Trabelsi, Amrindra Pal, Sofyan A. Taya, Ram Bharos Yadav
Summary: This study proposes an SF11 Prism- Ag- ZnO nanowires-CeO2-Sensing layer-based surface plasmon resonance sensor for measuring dopamine concentration in human blood. The sensor demonstrates high sensitivity and detection accuracy, and holds significant importance for early diagnosis of neurological diseases.
OPTICAL MATERIALS (2024)
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Article Materials Science, Multidisciplinary
DFT theoretical and experimental investigations of the effect of Cu doping within SILAR deposited ZnS
M. Taoufiq, A. Soussi, A. Elfanaoui, A. Ait Hssi, S. Baoubih, A. Ihlal, K. Bouabid
Summary: In this study, the effect of copper doping within ZnS on glass substrates was investigated through experimental and theoretical approaches. Pure ZnS and Cu-doped ZnS films with varying copper concentrations were deposited on glass substrates using the SILAR technique. The structural, morphological, and optical properties of the films were characterized, and the theoretical FP-LAPW method based on density functional theory was employed to study the properties of copper-doped ZnS.
OPTICAL MATERIALS (2024)
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