Yao Li

Nanjing University

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Yongbing Xu

Nanjing University

Liang He

Nanjing University

Fengqiu Wang

Nanjing University

Xuezhong Ruan

Nanjing University

Xianyang Lu

Nanjing University

Yafei Meng

Laser Research Institute

Rong Zhang

Nanjing University

Jing Wu

Anhui University of Science and Technology

Jun Du

Nanjing University

Xiaorong Gu

Nanjing University of Aeronautics and Astronautics

Cooperative Institutions

Nanjing University

161

Chinese Academy of Sciences

108

Collaborative Innovation Center of Advanced Microstructures

University of Chinese Academy of Sciences

National Laboratory of Solid State Microstructures

University of York

Shanghai Jiao Tong University

Southeast University

East China Normal University

University of Science and Technology of China

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Design, synthesis, and biological evaluation of chalcone oxime derivatives as potential immunosuppressive agents

Bioorganic & Medicinal Chemistry Letters (2012)

Yin Luo Ran Song Yao Li Shuai Zhang Zhijun Liu

Chalcone

IC50

10.1016/j.bmcl.2012.03.080

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Citations (51)

Enhanced orbital magnetic moment of Co film grown on Fe3O4(001)

AIP Advances (2024)

Zhe Zhang Xianyang Lu Z. C. Li Zhuoyi Li Yu Yan

We investigate the magnetic and electronic properties of Co films on Fe3O4(001) achieved through epitaxial growth using magnetron sputtering. X-ray magnetic circularly dichroism measurements characterize the atomic magnetism. Compared to Co films on the MgO substrate, Co on Fe3O4 exhibits a 96% enhancement in orbital magnetic moment (from 0.25 to 0.49 µB/atom) and an increase in spin magnetic moment (from 1.37 to 1.53 µB/atom), resulting in an increased mratio(ml/ms) from 0.18 to 0.32. This enhancement of the orbital moment emerges as a consequence of the interface interaction between Co and Fe3O4. Density functional theory calculations attribute this heightened orbital magnetic moment to the robust electronic exchange interactions. Our findings not only offer insights into the modulation of magnetic and electronic characteristics in Co-based magnetic heterostructures but also provide valuable implications for the potential application of magnetic oxide/ferromagnetic heterostructures in future spintronic devices.

10.1063/5.0176740

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Long-cavity nanosecond thulium fiber laser: A compact source of energetic mid-IR pulses

Yao Li Xing Bi Yafei Meng Xiaokang Cao Yongbing Xu

We demonstrate nanosecond operation in an elongated cavity thulium fiber laser: a simple scheme for pulse energy scaling and repetition rate reduction. 7.5 nJ pulses with a repetition rate of 330 kHz are achieved.

Thulium

Nanosecond

10.1109/cleopr.2015.7376378

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Spin-ARPES EUV Beamline for Ultrafast Materials Research and Development

Applied Sciences (2019)

Zhonghui Nie Ion Cristian Edmond Turcu Yao Li Xiaoqian Zhang Liang He

A new femtosecond, Extreme Ultraviolet (EUV), Time Resolved Spin-Angle Resolved Photo-Emission Spectroscopy (TR-Spin-ARPES) beamline was developed for ultrafast materials research and development. This 50-fs laser-driven, table-top beamline is an integral part of the “Ultrafast Spintronic Materials Facility”, dedicated to engineering ultrafast materials. This facility provides a fast and in-situ analysis and development of new materials. The EUV source based on high harmonic generation process emits 2.3 × 1011 photons/second (2.3 × 108 photons/pulse) at H23 (35.7 eV) and its photon energy ranges from 10 eV to 75 eV, which enables surface sensitive studies of the electronic structure dynamics. The EUV monochromator provides the narrow bandwidth of the EUV beamline while preserving its pulse duration in an energy range of 10–100 eV. Ultrafast surface photovoltaic effect with ~650 fs rise-time was observed in p-GaAs (100) from time-resolved ARPES spectra. The data acquisition time could be reduced by over two orders of magnitude by scaling the laser driver from 1 KHz, 4W to MHz, KW average power.

Extreme Ultraviolet Lithography

Monochromator

Extreme ultraviolet

Photon energy

Pulse duration

10.3390/app9030370

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Citations (15)

Polarization-multiplexed, single-cavity dual-comb fiber laser based on a birefringent crystal and a saturable absorber

Optics Express (2022)

Xiaorong Gu Gaowei Wang Yao Li Haonan Gong Yiqiu Liang

We introduce a calcium carbonate birefringent crystal into an Er-fiber laser mode-locked by a saturable absorber, where dual-comb ultrashort pulses with orthogonal polarization have been obtained. The two ultrashort pulse trains from the laser exhibit polarization contrast ratios of 30 dB and 20 dB, indicating that the dual-comb mode-locking is due to the polarization-multiplexing mechanism. The dual-comb ultrashort pulses have central wavelengths of 1564.41 nm and 1564.51 nm, and pulse durations of 825 fs and 805 fs respectively. The optical spectra and pulse durations of the asynchronous ultrashort pulses are nearly identical, so that the output of the laser could be directly used for dual-comb applications. Besides, the repetition-rate difference of the two mode-locked pulses is 673 Hz, while its drift is only 0.093 Hz within 2 hours' time. The low drift of the repetition-rate difference manifests the single-cavity dual-comb Er-fiber laser has a high stability and high common-mode noise suppression. At last, we have tested the dual-comb fiber laser in a ranging experiment, where clear interferogram signal can be observed. The experimental results prove that this single-cavity dual-comb Er-fiber laser based on the birefringent crystal and saturable absorber can be a potential source for spectroscopy, optical imaging, absolute distance measurement and other dual-comb applications.

Saturable absorption

Mode-Locking

10.1364/oe.477722

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Citations (10)

Efficient spin–orbit torque switching in perpendicularly magnetized CoFeB facilitated by Fe2O3 underlayer

Applied Physics Letters (2023)

Zhuoyi Li Xianyang Lu Zhe Zhang Wenjia Li TaoTao Li

Spin–orbit torque (SOT) is recognized as an effective way to manipulate magnetization in spintronic devices. For the low-power consumption and high-endurance requirements of future computer architectures, reducing the critical SOT switching current density and improving SOT efficiency are crucial, especially in the perpendicularly magnetized structures. Here, we have conducted a comprehensive study on improving the SOT efficiency of the Ta/CoFeB structure with a perpendicular magnetic anisotropy by inserting an oxide insulating layer Fe2O3 as the bottom layer. We found that only a 1–5 nm thickness of Fe2O3 significantly reduces the SOT critical switching current by 70% and enhances the spin Hall angle of Ta. The spin Hall angle increases from 0.078 for pure Ta/CoFeB to 0.13 for Fe2O3/Ta/CoFeB, and both types of spin–orbit torques, damping-like and field-like torques, are significantly enhanced. It is suggested that the atomic diffusion of O from the Fe2O3 underlayer leads to the partial oxidization of the Ta layer as well as the Ta/CoFeB interfaces, accounting for the observed enhanced SOT efficiency. Our results provide a reliable method to improve the SOT performance in perpendicularly magnetized structures by inserting the oxide underlayer using magnetron sputtering, in favor of its potential real-world application in spintronic devices.

10.1063/5.0163034

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Optimization of Synchronized Single-Photon Frequency Upconversion by Temporal and Spectral Control

Conference on Lasers and Electro-Optics (2010)

Xiaorong Gu E Wu Kun Huang Yao Li Haifeng Pan

Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text X. Gu, E. Wu, K. Huang, Y. Li, H. Pan, and H. Zeng, "Optimization of Synchronized single-photon frequency upconversion by temporal and spectral control," in Conference on Lasers and Electro-Optics 2010, OSA Technical Digest (CD) (Optica Publishing Group, 2010), paper QFB4. Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article

Photon Upconversion

10.1364/qels.2010.qfb4

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A laser-produced plasma source based on thin-film Gd targets for next-generation extreme ultraviolet lithography

Plasma Science and Technology (2023)

Xiao Dong Chen Yao Li Jianbo Hou Zhe Zhang Xianyang Lu

Abstract We have studied laser-produced plasma based on mass-limited thin-film Gd targets for beyond the current extreme ultraviolet (EUV) light source of 13.5 nm wavelength based on tin. The influences of the laser intensity on the emission spectra centered around 6.7 nm from thin-film Gd targets were first investigated. It is found that the conversion efficiency of the produced plasma is saturated when the laser intensity goes beyond 2 × 10 11 W cm −2 . We have systematically compared the emission spectra of the laser-produced plasma with the changes in the thicknesses of the thin-film Gd targets. It is proved that a minimum-mass target with a thickness of 400 nm is sufficient to provide the maximum conversion efficiency, which also implies that this thickness is the ablation depth for the targets. These findings should be helpful in the exploration of next-generation EUV sources, as the thin-film Gd targets will reduce the debris during the plasma generation process compared with the bulk targets.

Extreme Ultraviolet Lithography

Extreme ultraviolet

Laser Ablation

Ultraviolet

10.1088/2058-6272/acd61e

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Citations (2)

Adjustable electronic, optical and photocatalytic properties of black phosphorene by nonmetal doping

Applied Surface Science (2019)

Yafei Zhao Jiai Ning Xiaoying Hu Jian Tu Wenqin Zou

Nonmetal

Phosphorene

Visible spectrum

Environmental Pollution

10.1016/j.apsusc.2019.144488

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Citations (17)

Nanotube mode-locked, wavelength and pulsewidth tunable thulium fiber laser

Optics Express (2019)

Ruihong Dai Yafei Meng Yao Li Jiarong Qin Shining Zhu

Mode-locked oscillators with highly tunable output characteristics are desirable for a range of applications. Here, with a custom-made tunable filter, we demonstrate a carbon nanotube (CNT) mode-locked thulium fiber laser with widely tunable wavelength, spectral bandwidth, and pulse duration. The demonstrated laser's wavelength tuning range reached 300 nm (from 1733 nm to 2033 nm), which is the widest-ever that was reported for rare-earth ion doped fiber oscillators in the near-infrared. At each wavelength, the pulse duration can be regulated by changing the filter's bandwidth. For example, at ~1902 nm, the pulse duration can be adjusted from 0.9 ps to 6.4 ps (the corresponding output spectral bandwidth from 4.3 nm to 0.6 nm). Furthermore, we experimentally and numerically study the spectral evolution of the mode-locked laser in presence of a tunable filter, a topic that has not been thoroughly investigated for thulium-doped fiber lasers. The detailed dynamical change of the mode-locked spectra is presented and we observed gradual suppression of the Kelly sidebands as the filter's bandwidth is reduced. Further, using the polarization-maintaiing (PM) cavity ensures that the laser is stable and the output laser's polarization extinction ratio is measured to exceed 20 dB.

Thulium

Pulse duration

Spectral width

Mode-Locking

10.1364/oe.27.003518

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Citations (40)