Article
Nanoscience & Nanotechnology
Rashid A. Ganeev, V. S. Popov, A. Zvyagin, N. A. Lavrentyev, A. E. Mirofyanchenko, E. Mirofyanchenko, I. A. Shuklov, O. Ovchinnikov, V. P. Ponomarenko, V. F. Razumov
Summary: Bismuth telluride nanoparticles exhibit nonlinear optical properties including saturable absorption and positive nonlinear refraction. Stronger excitation leads to reverse saturable absorption dominating over other nonlinear optical processes. In thin films containing these nanoparticles, significant growth of the nonlinear optical parameters is achieved compared to colloidal Bi2Te3 NPs.
Article
Nanoscience & Nanotechnology
Yingtian Xu, Hanfei Hu, Hongda Wu, Chongyang Xu, He Zhang, Liang Jin, Yonggang Zou, Xiaohui Ma, Jingzhi Yin
Summary: The study demonstrated the use of CuCrO2 nanoparticle-polyimide composite film as a saturable absorber to regulate the output characteristics of a passively Q-switched fiber laser at 1.55 micrometers. By utilizing reverse saturable and saturable absorptions, the laser showed significant performance enhancement with two stages of output. This approach resulted in pulse duration and repetition rate compression simultaneously, highlighting the importance of proper cavity loss design in optimizing Q-switched pulse laser output characteristics.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Optics
Nathalie Vermeulen
Summary: This article reviews the nonlinear-optical experiments with graphene, focusing particularly on its third-order nonlinearities. Graphene has shown remarkable saturable absorption properties and strong nonlinear refraction effects, which hold promise for practical applications in nonlinear-optical devices. The article discusses the relevant material parameters for future research and development and highlights specific features of graphene's linear and nonlinear-optical properties that are sometimes overlooked. The author concludes by sharing their perspective on the opportunities and remaining challenges in using graphene for nonlinear-optical applications.
Article
Engineering, Electrical & Electronic
E. S. Kadir, R. N. Gayen
Summary: The study compared the mechanical energy harvesting properties of highly flexible, stretchable, and free-standing poly(vinylidene fluoride) (PVDF) membranes loaded with various nanofillers like zinc oxide (ZnO), graphene oxide (GO), and ZnO/GO composites. Composite polymer membranes with dominating beta-crystalline phase were synthesized using a simpler and low-cost chemical method. The mechanical to electrical energy conversion was observed by applying repetitive mechanical stress in different modes to the composite membranes.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Optics
Xiaochen Zhang, He Zhang, Liang Jin, Xiaohui LI, Shangzhi Xie, Xiaohui Ma
Summary: We propose a novel method based on microfiber-assisted nonlinear multimode interference to generate dual wavelength in a single fiber-ring oscillator. The mode locker not only enhances spatial filtering and spectral filtering, but also improves the signal-to-noise ratio of the mode-locked pulse compared to single mode fiber-graded index multimode fiber-single mode fibers (SMSs). In the experiment, a stable and compact dual-wavelength mode-locked output is achieved using the proposed mode-locked fiber laser without complex controlling electronics. This optimized mode-locking method provides a compact and low-cost solution for dual-comb systems.
Article
Chemistry, Physical
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)
Article
Chemistry, Physical
Marie Colin, Sam Chen, Hani Farhat, Katia Guerin, Marc Dubois
Summary: This study demonstrates that fluorination of graphene oxide films under mild conditions can result in highly fluorinated graphene oxide films with maintained structure and mechanical strength. The fluorinated films exhibit unique electrochemical properties in lithium batteries and can potentially be used as hydrophobic lubricant membranes.
Article
Physics, Applied
Weimin Chen, Wenbin Xiang, Chunzheng Bai, Baohua Zhu, Bing Gu, Changgui Lv, Jiayu Zhang
Summary: Amorphous GeSe films were prepared by vacuum thermal evaporation and exhibited polycrystalline phase after annealing. The films showed reverse saturable absorption and self-focusing phenomenon. The annealed recrystallized GeSe films had significantly improved nonlinear optical parameters and potential applications in optical limiting devices.
APPLIED PHYSICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Chunhui Lu, Mingwei Luo, Yanqing Ge, Yuanyuan Huang, Qiyi Zhao, Yixuan Zhou, Xinlong Xu
Summary: Two-dimensional layered materials exhibit layer-dependent optical properties in nonlinear optics due to complex nonlinear absorption processes, which are difficult to understand. Experimental results show that the nonlinear optical properties of chalcogenide compounds are related to both pump intensity and layer number, with saturable absorption occurring in thick samples and reverse saturable absorption occurring in thin samples. The transition between two-photon absorption and saturable absorption is found to be dependent on the layer thickness and band gaps in the materials.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
A. S. Kulagina, A. V. Sandulenko, V. M. Volynkin, S. K. Evstropiev
Summary: The study shows that vanadium-doped plasticized epoxy polymer composites exhibit a broad absorbance band at a wavelength of 950 nm, making them suitable for use as passive Q-switches in laser systems.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2021)
Article
Energy & Fuels
Rongfang Wu, Xinjin Xu, Na Li, Congcong Liu, Xiao Chen, Zhihong Chen, Xiaoqi Lan, Qinglin Jiang, Jingkun Xu, Fengxing Jiang, Peipei Liu
Summary: Researchers prepared composite films of carboxylated graphene (CG) and poly(3, 4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) as electrodes for flexible electrochemical capacitors. The films exhibited high specific capacitance, excellent rate capability, and good electrochemical stability. Moreover, the films treated with DMF showed even better capacitive properties, making them suitable for wearable energy storage devices.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Lu Li, Jingjing Xu, Xin Lyu, Zhanfang Liu, Zihe Song, Juan Wei
Summary: In this study, novel broad wavelength-shifted thermoresponsive sensors were fabricated by introducing ferrocene groups into polymeric photonic crystals. These sensors are more suitable for thermosensors due to their advantages, such as simple preparation, broad wavelength shifts (up to 162 nm), visible color change, and strong anti-interference ability.
CHEMICAL COMMUNICATIONS
(2022)
Article
Polymer Science
Ali Tarhini, Ali Tehrani-Bagha, Michel Kazan, Brian Grady
Summary: This study investigates the impact of graphene flake size on the properties of PVDF-HFP composites, demonstrating that larger graphene flakes result in higher electrical and thermal conductivity, as well as tensile strength. The composite films with larger graphene flakes achieved ultra-high in-plane electrical conductivity, in-plane thermal conductivity, and tensile strength. These values are reported to be the highest among PVDF-based composites in the literature.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Hsiao-Ping Hsu, Manjesh K. Singh, Yu Cang, Heloise Therien-Aubin, Markus Mezger, Ruediger Berger, Ingo Lieberwirth, George Fytas, Kurt Kremer
Summary: A new method for creating nanoporous polymer membranes with well defined pore diameters is introduced, which involves mechanical deformation and quenching of highly entangled polymer films. The approach is validated using polystyrene films and does not require chemical processing, supporting substrate, or self-assembly. The resulting membranes exhibit stable properties and impressive elasticity, with pore diameters on the order of ten polymer reptation tube diameters.
Article
Polymer Science
Jubair Ahmed, Tanveer A. Tabish, Shaowei Zhang, Mohan Edirisinghe
Summary: Graphene has been explored for its potential as a membrane material for polymer composite fibers, with recent progress in incorporating porous graphene into high-output polymer fibers. This study successfully demonstrated the production of graphene-loaded microfibers with carrier polymer, and the incorporation of porous graphene into high-output polymer matrices. Analysis using various techniques confirmed the achievement of single layer graphene structures in fibers with diameters ranging from 3-8 μm.
Article
Optics
Tianju Zhang, Chaocheng Zhou, Jia Lin, Jun Wang
Summary: Compared to lead-based perovskites, 2D tin-based perovskites have lower photoluminescence quantum yields and enhanced emission linewidths. The difference in emission properties can be attributed to the stronger exciton-phonon scattering intensity and higher defects density in tin-based perovskites, which significantly broaden the emission linewidth and accelerate the exciton relaxation process, leading to a reduction in photoluminescence quantum yields.
CHINESE OPTICS LETTERS
(2022)
Article
Multidisciplinary Sciences
Tianju Zhang, Chaocheng Zhou, Xuezhen Feng, Ningning Dong, Hong Chen, Xianfeng Chen, Long Zhang, Jia Lin, Jun Wang
Summary: This study investigates the luminescence mechanism of Sn-based perovskites and reveals that deformation potential scattering caused by charged defects dominates the interband relaxation of excitons.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Xin Chen, Jiawei Huang, Chenduan Chen, Meiling Chen, Guohang Hu, Hongqiang Wang, Ningning Dong, Jun Wang
Summary: PdSe2 exhibits significant saturable absorption performance, with a modulation depth of 22.47% at 520 nm. A visible light thresholder based on PdSe2 is proposed to improve signal-to-noise ratio, while the intrinsic recombination mechanism is revealed through pump-probe technique and first-principles calculation.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Chaocheng Zhou, Tianju Zhang, Chao Zhang, Xiaolin Liu, Jun Wang, Jia Lin, Xianfeng Chen
Summary: This study demonstrates that a small amount of indium ions can effectively repair defects, improve energy-level alignment, and reduce hot-carrier losses in perovskite solar cells, leading to higher efficiency and stability.
Article
Optics
Jiawei Huang, Ningning Dong, Niall McEvoy, Lei Wang, Hongqiang Wang, Jun Wang
Summary: This study investigates the exciton-like inter-sub-band resonance absorption and optical bleaching of platinum sulfide (PtS) in the resonant region, as well as free-carrier absorption and defect-assisted Auger recombination in the transparent region. The experimental results show good agreement with the theoretical model based on the mid-gap carrier-capture model considering the complex optical conductivity. This work provides a better understanding of the ultrafast photoinduced carrier behavior in PtS and its potential applications in photoelectric devices.
LASER & PHOTONICS REVIEWS
(2022)
Article
Optics
Chenduan Chen, Ningning Dong, Jiawei Huang, Zixin Wang, Jun Wang
Summary: This work systematically investigates the third-order nonlinear optical properties and ultrafast carrier dynamics of layered indium selenide obtained by mechanical exfoliation. The results suggest that layered indium selenide exhibits two-photon absorption response and achieves saturation under visible light excitation. Furthermore, it shows a fast recombination time and a high optical modulation speed in the visible region.
Article
Nanoscience & Nanotechnology
Tianju Zhang, Chaocheng Zhou, Jia Lin, Jun Wang
Summary: This study investigates the influence of defects and phonon scattering on the Auger recombination process of two-dimensional tin iodide perovskite LEDs. It reveals that defect scattering dominantly regulates the Auger recombination rate in these perovskites.
Article
Nanoscience & Nanotechnology
Mingang Zhang, Xiangdong Xu, Jinrong Liu, Yadong Jiang, Jun Wang, Ningning Dong, Chenduan Chen, Baohua Zhu, Yuning Liang, Ting Fan, Jimmy Xu
Summary: Given the substantial pi-electron delocalization observed in 4-N,N-dimethylamino-4'-N'-methyl-stilbazolium tosylate (DAST), a high third-order nonlinear optical response can be expected. In this study, all-organic DAST-polymethyl methacrylate (PMMA) composite films were prepared and their nonlinear absorption performances were measured. The results showed that the composite films exhibited giant optical limiting (OL) responses, high flexibility, and excellent environmental stability. This suggests that these all-organic composite films have great potential for applications in flexible OL devices.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Review
Optics
Yu Mao, Lei Wang, Chenduan Chen, Zhan Yang, Jun Wang
Summary: The determination of the number of layers of 2D materials is crucial for controlling the performance of nanoelectronic and optoelectronic devices. Various optical technologies have been proposed to determine the thickness of samples by studying the relationship between the number of layers and optical properties. The rapid growth of 2D materials and heterostructures in the past decade has exceeded the capabilities of traditional experimental and computational methods. Machine learning is emerging as a powerful tool to support these methods and explore the full potential of optical technology.
LASER & PHOTONICS REVIEWS
(2023)
Article
Materials Science, Multidisciplinary
Mingang Zhang, Xiangdong Xu, Wenjie Hu, Yadong Jiang, Chenduan Chen, Ningning Dong, Jun Wang, Yuning Liang, Baohua Zhu, Han Zhang, Jimmy Xu
Summary: In this study, the third-order nonlinear optical (NLO) absorption properties and ultra-fast carrier dynamics of organic material DAST were investigated. The results showed that DAST exhibited ultra-high nonlinear saturable absorption (SA) responses and reliable long-term stability. These findings are of great significance for the development of high-performance optoelectronic devices based on organic materials in the future.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jiawei Huang, Lei Tao, Ningning Dong, Hongqiang Wang, Song Zhou, Jun Wang, Xiaoyue He, Kehui Wu
Summary: This study explores the launching and propagating properties of HPhPs in α-MoO3 along orthogonal crystal orientations using a holey silicon nitride microcavity, providing abundant possibilities for applications and operations in nanophotonics.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Multidisciplinary Sciences
Xin Chen, Ivan M. Kislyakov, Tiejun Wang, Yafeng Xie, Yan Wang, Long Zhang, Jun Wang
Summary: The authors report a pulsed laser-induced photoacoustic driving force that can overcome the van der Waals adhesion forces between 2D semimetallic nanosheets and insulating substrates. Optically controlled nanomachine engineering can satisfy the touch-free and non-invasive demands of optoelectronics, nanotechnology, and biology.
NATURE COMMUNICATIONS
(2023)
Article
Optics
Yiming Pan, Eliahu Cohen, Ebrahim Karimi, Avraham Gover, Norbert Schonenberger, Tomas Chlouba, Kangpeng Wang, Saar Nehemia, Peter Hommelhoff, Ido Kaminer, Yakir Aharonov
Summary: In this study, a new measurement-based framework is developed to investigate classical and quantum interactions between free electrons and photons, and is experimentally tested. It is found that classical electron-photon interactions can be represented as outcomes of weak measurement. The transition from quantum to classical measurement is quantified by a universal factor.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Optics
Zixin Wang, Xiaowei Ji, Ningning Dong, Chenduan Chen, Zhouyuan Yan, Xun Cao, Jun Wang
Summary: In this study, the changes in the optical properties of VO2 films induced by fs laser were investigated using a variable-temperature Z-scan. The results showed that high-repetition-frequency laser can induce phase transition in VO2, which is reversible and leads to significant changes in the optical properties of the film.
Article
Optics
Wang Zixin, Dong Ningning, Wang Lulu, Cao Xun, Wang Jun
Summary: Semiconductor-metal phase transition in metal oxides, such as vanadium dioxide (VO2), has attracted significant attention due to their scientific significance and potential applications. The phase transition in VO2 can be triggered by various excitations, and the process is reversible and leads to significant changes in optical properties. This makes VO2 widely used in optical switches, smart windows, and laser protection. With the rapid development of femtosecond laser technology, researchers are increasingly interested in studying the laser-induced phase transition of VO2. The ability to control the phase transition on ultrafast time scales using optical means could benefit its applications in memory devices and ultrafast optical switches.
ACTA PHOTONICA SINICA
(2022)
