Article
Chemistry, Multidisciplinary
Kai Pang, Xiaoting Liu, Jintao Pang, Akram Samy, Jin Xie, Yingjun Liu, Li Peng, Zhen Xu, Chao Gao
Summary: This study presents a highly efficient acoustic absorber by constructing cellular networks of ultrathin graphene membranes into polymer foams. The graphene drums exhibit strong resonances and efficiently dissipate sound waves. This scalable method allows for transforming commercial polymer foams into superior acoustic absorbers.
ADVANCED MATERIALS
(2022)
Article
Optics
Hong Hong, Qiudi Chen, Yuhao Wang, Peixiong Zhang, Zhen Li, Zhenqiang Chen
Summary: This study successfully prepared a two-dimensional In2O3 molecular crystal for the first time and utilized it as a saturable absorber to achieve passive Q-switching on an Nd/Gd:YAlO3 solid-state laser. The research indicates the potential applications of In2O3-SA in the spectral region around 1 micrometer and may accelerate the development of two-dimensional materials in the field of ultra-fast photonics.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Shurong Jiang, Chen Wei, Le Zheng, H. Zhou, W. Liu, J. Zhang, H. Zhang, Yong Liu
Summary: We report a transition metal dichalcogenides-PtSe2 Q-switched single-mode fiber laser operating at 2783.2 nm with a nearly watt-level average output power. By incorporating a PtSe2 coated mirror as a saturable absorber, stable Q-switched laser pulses were obtained with high average power and pulse energy. The operating wavelength range of the PtSe2-coated mirror was also investigated using a plane ruled grating.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Engineering, Electrical & Electronic
N. Li, H. Jia, M. Guo, J. Zhang, W. Y. Zhang, Z. X. Guo, M. X. Li, Z. X. Jia, G. S. Qin
Summary: In this study, passively Q-switched fiber lasers operating at wavelengths of 1, 1.5, and 2 μm were demonstrated using FONPs as a broadband saturable absorber. This represents the first use of a single SA based on FONPs for wide-band Q-switching operation of fiber lasers from 1 to 2 μm.
OPTICAL FIBER TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Congcong Liu, Qiaoqiao Xu, Zhuo Li, Jiangyong He, Pan Wang, Yi Huang, Yange Liu, Zhi Wang
Summary: This study presents a Q-switched Er-doped all-fiber laser utilizing a Ti3C2Tx saturable absorber, which demonstrates stable operation with excellent modulation depth, repetition frequency, and output power stability.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Yunjia Wang, Jianwen Wang, Qiao Wen
Summary: The study successfully constructed a MXene-GO nano-heterojunction for passive Q-switching in Nd:YAG solid-state lasers, generating stable ultrashort pulses with high peak power.
Article
Engineering, Electrical & Electronic
Liying Zhang, Fang Wang
Summary: In this study, passively Q-switched erbium-doped fiber lasers based on SnO2 saturable absorber (SA) were constructed and experimentally verified. It was found that SnO2 can serve as a Q-switch for near-infrared fiber lasers, achieving stable Q-switching operations. By comparing the performance of the SnO2 film and SnO2-DF SA, it was observed that the SnO2-DF SA exhibited significantly improved Q-switched pulses at 1530 nm. These findings have important implications for the progress of nonlinear optics and pulsed fiber lasers.
OPTICAL FIBER TECHNOLOGY
(2023)
Article
Physics, Applied
Shang Gao, Wei Wang
Summary: In this study, few-layered MoSe2 nanosheets were fabricated using the ultrasonic-assisted liquid phase exfoliation method, with typical characterizations confirming their nonlinear absorption properties. A passively Q-switched Nd:YVO4 laser emitting 1 micron wavelength was successfully demonstrated with the MoSe2 saturable absorber, generating stable pulses with a maximum output power of 215 mW and a shortest pulse width of 192 ns. The experimental data provides a solid foundation for the photonics applications of MoSe2 nanomaterials.
MODERN PHYSICS LETTERS B
(2021)
Article
Engineering, Electrical & Electronic
Dongfang Lan, Tonglei Cheng, Yuhan Qu, Xuenan Zhang, Xin Yan, Takenobu Suzuki, Yasutake Ohishi, Fang Wang
Summary: In this study, a WC film was successfully demonstrated to induce passive Q-switching in an EDFL, showing great potential for applications in ultrafast optoelectronics. The WC nanoparticles were synthesized by a hydrothermal method. Stable Q-switched pulses were generated at 1558 nm, with a maximum pulse energy of 81 nJ and an output power of 2.9 mW.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Optics
Teng Zhang, Lunbin Zhou, Jingyu Zou, Yikun Bu, Bin Xu, Xiaodong Xu, Jun Xu
Summary: In this study, compact blue-diode-pumped Pr,Mg:SrAl12O19 (SRA) lasers were demonstrated in continuous-wave and passively Q-switched regimes. The lasers showed promising performance in terms of output powers and efficiencies, highlighting the potential of Pr,Mg:SRA as a compact and efficient laser source in the visible spectral range.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Chemistry, Physical
Bian Wu, Biao Chen, Shuai Ma, Ding Zhang, Hao-Ran Zu
Summary: In this paper, an ultra-broadband and highly-efficient metamaterial absorber (MMA) is presented. The unit cell of the proposed MMA consists of two cross-placed stand-up gradient impedance graphene films, which improve impedance matching. The simulated and measured results demonstrate its potential applications in stealth technologies and electromagnetic interference.
Article
Optics
Yuxia Zhang, Liang Dong, Wenjuan Han, Honghao Xu, Degao Zhong, Junhai Liu
Summary: We present the performance of a Yb:YPO4 microchip laser with a 2D WS2 saturable absorber, which shows high efficiency operation in both continuous-wave (CW) and passive Q-switching mode. The laser generated a CW output power of 3.81 W with an optical conversion efficiency of 60.5% and a slope efficiency of 71% when absorbing 6.30 W of pump power. In the passive Q-switching mode, a pulsed output power of 1.67 W was achieved at a repetition frequency of 660 kHz, with a slope efficiency of 52%. By using different output mirrors, pulse energy, pulse width, and peak power of 2.52 μJ, 67 ns, and 31.7 W, respectively, were obtained. These results represent a significant improvement in the CW and passive Q-switching performance of Yb:YPO4 microchip lasers.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Crystallography
Yijian Sun, Houping Xia
Summary: In this work, a Bi2Te3/graphene heterostructure with good nonlinear absorption characteristics was synthesized and investigated as a saturable absorber for pulsed lasers. The heterostructure showed improved performance compared to pure Bi2Te3 based lasers, demonstrating its potential as a promising saturable absorber for solid-state pulsed lasers emitting at ~1 μm.
Article
Materials Science, Multidisciplinary
Bingzheng Yan, Haowen Guo, Guanbai He, Jiajia Mao, Feifei Wang, Kejian Yang, Baitao Zhang, Jingliang He
Summary: High-quality 2D tantalum nickel selenide nanosheets with excellent broadband saturable absorption properties were successfully fabricated in this study. Utilizing Ta2NiSe5 nanosheets as saturable absorbers, three passively Q-switched solid-state lasers and a mode-locked laser with pulse width as short as 356 fs were realized. This work not only demonstrates the excellent nonlinear optical properties of Ta2NiSe5, but also opens up possibilities for exploring the photonic and optoelectronic properties of ternary chalcogenide materials.
SCIENCE CHINA-MATERIALS
(2021)
Article
Biochemistry & Molecular Biology
Ping Hu, Jiajia Mao, Hongkun Nie, Ruihua Wang, Baitao Zhang, Tao Li, Jingliang He, Kejian Yang
Summary: A saturable absorber (SA) based on niobium diselenide (NbSe2) was fabricated using optically driven deposition method, showing excellent nonlinear optical properties and successfully applied in a stable passively Q-switched erbium-doped all-fiber laser, achieving the shortest pulse duration and highest pulse energy ever reported for an NbSe2 SA in a Q-switched fiber laser.
Article
Chemistry, Analytical
Qiang Tang, Shangru Zhou, Ruiheng Hu, Huai Zheng, Junheng Pan, Jau Tang
Article
Nanoscience & Nanotechnology
Dan Ye, Jun Li, Jau Tang
Editorial Material
Nanoscience & Nanotechnology
Dan Ye, Jun Li, Jau Tang
Review
Chemistry, Physical
Weijian Chen, Zhixing Gan, Martin A. Green, Baohua Jia, Xiaoming Wen
Summary: This review discusses the mobile ion dynamics in halide perovskites investigated via luminescence spectroscopy combined with confocal microscopy, including mobile ion induced fluorescence quenching, phase segregation in mixed halide hybrid perovskite, and mobile ion accumulation at the interface in perovskite devices. Steady-state and time-resolved luminescence imaging techniques, combined with confocal microscopy, are unique tools for probing ionic dynamics in perovskites, providing invaluable insights on ionic dynamics in nanoscale resolution.
Article
Nanoscience & Nanotechnology
Weijian Chen, Ngoc Duy Pham, Hongxia Wang, Baohua Jia, Xiaoming Wen
Summary: Optimized additives significantly improve charge carrier transfer in perovskite solar cells.
The hole mobility and conductivity of hole transport layers are crucial in suppressing mobile-ion accumulation at solar cell interfaces.
Engineering additives plays a key role in accelerating the commercialization of perovskite photovoltaics.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Hao Wu, Xin Ying Kong, Xiaoming Wen, Siang-Piao Chai, Emma C. Lovell, Junwang Tang, Yun Hau Ng
Summary: Encapsulating Cu2O nanowires in metal-organic frameworks (MOFs) enhances activity and stability, facilitates charge separation and CO2 uptake, leading to selective photocatalytic CO2 reduction into CH4. This work demonstrates an effective strategy for CO2 conversion by integrating MOFs with metal oxide photocatalyst.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Review
Chemistry, Multidisciplinary
Zhixing Gan, Yingchun Cheng, Weijian Chen, Kian Ping Loh, Baohua Jia, Xiaoming Wen
Summary: 2D organic-inorganic hybrid Ruddlesden-Popper perovskites have garnered attention for their unique photophysics, with room for improvement in performance of photoelectronic devices.
Article
Chemistry, Multidisciplinary
Xuewen Fu, Siyu Liu, Bin Chen, Jau Tang, Yimei Zhu
Summary: Studying the superfast unidirectional ballistic dynamics of individual nanoparticles along the liquid-gas interface and manipulating them using four-dimensional electron microscopy. Experimental results show that nanoparticles exhibit continuous superfast unidirectional translation upon repetitive femtosecond laser excitation, driven by unidirectional random impulsive forces induced by nanobubbles, which can be controlled by tuning laser characteristics. This directional plasmonic NB-propulsion mechanism provides insights for the design of light-controllable artificially intelligent micro/nanomotor systems.
Article
Chemistry, Multidisciplinary
Haihua Liu, Thomas E. Gage, Prem Singh, Amit Jaiswal, Richard D. Schaller, Jau Tang, Sang Tae Park, Stephen K. Gray, Ilke Arslan
Summary: This study reports direct imaging of the local plasmonic coupling between single Au nanocapsules and graphene step edges at the nanometer scale for the first time, indicating that this hybrid system could be used to manipulate the localized electromagnetic field on the nanoscale.
Article
Chemistry, Multidisciplinary
Chun Gu, Hang Zhang, Yonggang Liu, Junhong Yu, Junheng Pan, Guoqiang Luo, Qiang Shen, Jau Tang, Jianbo Hu
Summary: The study observed a novel behavior of hybrid carrier relaxation dynamics in highly defective ZnO crystals using transient absorption spectroscopy. This behavior may provide a new route for defect engineering in crystals with high defect density.
Article
Chemistry, Multidisciplinary
Qiang Tang, Xiaofeng Liu, Xiaxia Cui, Zhenpeng Su, Huai Zheng, Jau Tang, Sang Woo Joo
Summary: The study demonstrates droplet manipulation on nonslippery polymer surfaces using corona discharge, allowing for directional transport of droplets and revealing the dependence of motion on critical and driving distances. The driving mechanism is verified through experiments and simulations, enriching droplet manipulation techniques for various applications.
Article
Chemistry, Multidisciplinary
Qiang Tang, Zhibin Hu, Xiaxia Cui, Zechao Tao, Jau Tang
Summary: By introducing a ceramic tube, a water vapor electrodeless microwave plasma device is proposed to avoid the corrosion of metal electrodes. The device can work directly with liquid water without complex evaporation equipment. The study found that when the microwave power is greater than 800 W, the plasma torch can be excited permanently and stably without loss of ceramic. Optical spectroscopy confirmed the generation of oxygen atom, hydroxyl radical, and hydrogen atom during the decomposition of water vapor. The microwave discharge also improved the crystallinity of the ceramic. This work enriches the microwave plasma techniques for water vapor and has various applications in electric propulsion, hydrogen production, and surface treatment.
APPLIED SCIENCES-BASEL
(2022)
Article
Multidisciplinary Sciences
Jau Tang, Qiang Tang, Z. B. Hu
Summary: This study presents a dual-component model to analyze the quantum dynamics of relativistic particles and investigates the modulation of matter waves' phase and amplitude caused by Heisenberg's uncertainty principle. Simulation results indicate that mass oscillations are more prominent for light-weighted elementary particles. An interference experiment using neutrinos and electrons is proposed to test the predicted behaviors.
SCIENTIFIC REPORTS
(2022)
Article
Multidisciplinary Sciences
Ling Tong, Deshuai Li, Ting Su, Si Gao, Peng Wang, Jau Tang, Zhong Lin Wang, Kebin Shi, Zhi Wei Wang
Summary: Investigating coherent acoustic vibrations in nanostructured materials provides fundamental insights into optomechanical responses and microscopic energy flow. However, previous measurements have shown that only the dilation modes are launched after laser excitations, and the acoustic bending and torsional motions are absent. In this study, acoustic vibrational dynamics of individual Au nanoprisms on graphene substrates were investigated, revealing low-frequency multiple-mode oscillations and higher superposition amplitudes at nanoprism corners and edges. These findings contribute to the understanding of acoustic dynamics of nanostructures and their interaction with substrates.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Materials Science, Multidisciplinary
Junheng Pan, Sheng Liu, Jau Tang
Summary: The study focuses on the ultrafast transport processes of electrons and holes excited by femtosecond laser pulses, shedding light on carrier dynamics in semiconductors. Transient optical techniques and ultrafast scanning electron microscopy are utilized to investigate carrier excitation and transport. The research also elucidates the ballistic dynamics of hot carriers near a p-n junction.
