OPTICS EXPRESS
·
2022
·Vol. 30
·期 8
·12409-12419
·
IF 3.833
Le Zheng,Chen Wei,Hongrong Zhou,Fanxi Sun,Ang Gao,Dongsheng Wang,Dongsheng Wang,Yong Liu
Pulsed lasers operating in the mid-infrared are of great importance for numerous applications in spectroscopy, medical surgery, laser processing, and communications. In spite of recent advances with mid-infrared gain platforms, the lack of a capable pulse generation mechanism hinders the development of compact mid-infrared pulsed laser source. Here we show that MIL-68(Al) and MIL-68(Fe), which are aluminum- and iron- based metal-organic frameworks (MOFs) with ordered atoms distribution and periodic mesoporous structure, constitute exceptional optical switches for the mid-infrared. We fabricated the MIL-68(Al) and MIL-68(Fe) via hydrothermal method and prepared reflection-type MIL-68(Al)- and MIL-68(Fe)- saturable absorber mirrors (SAMs). By employing the as-prepared SAMs in the laser cavities, we achieved high-power nanosecond Q-switched fiber lasers at 2.8 µm. Especially, the average output power and pulse duration of the MIL-68(Al) Q-switched fiber laser reached 809.1 mW and 567 ns, respectively. To the best of our knowledge, this is the first time to demonstrate that MIL-68(M) can be efficient optical switches for 3-µm mid-IR laser pulses generation. Our findings reveal that MIL-68(M) is promising saturable absorber for compact and high-performance mid-infrared pulsed lasers.
研究领域:
光学
·
材料科学
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DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2021
·Vol. 40
·期 4
·507-514
·
IF 6
Jian-Hua Wang,Shao-Peng Wang,Pavel N. Melentiev,Bin Kang,Jing-Juan Xu,Hong-Yuan Chen
Comprehensive Summary SPASER nanoparticle (NP), with small size, ultranarrow spectral-line and good biocompatibility, is a potential biomedical nanoprobe. However, owning to the striking light absorption capacity of Au-resonator, huge energy could accumulate under strong pumping-laser, which would lead to poor photo-stability and unexpected photo-damage to SPASER NP, and is harmful to its future practical application but hasn't been systematically studied in experiment. In this paper, our experimental and theoretical researches revealed that the photo-stability of SPASER NP is largely determined by its structure parameters: smaller Au-core diameter, thicker silica-shell will contribute to better photo-stability. And the possibility and extent of photo-damage of SPASER NP depend on not only its intrinsic stability but also the external pumping-laser. Notably, the strong pumping condition for two-level SPASER system could lead to heating-melting-evaporation or even phase-explosion of SPASER NP, resulting in obvious photo-damage, while, the weak pumping condition for three-level SPASER system is quite friendly. This study provides reliable bases for the structural-properties optimization of SPASER NPs, which is of great significance for its future application as a novel luminescence probe.
研究领域:
生物医学
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纳米技术
·
光学
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DOI
高影响因子
CRYSTENGCOMM
·
2015
·Vol. 17
·期 45
·8697-8702
·
IF 4.034
Xiaolin Wu,Jiang-Long Wang,Hongrui Zhang,Shufang Wang,Shengjun Zhai,Yaguang Li,Dogheche Elhadj,Guangsheng Fu
c-axis oriented Bi1−xPbxCuSeO (0 ≤ x ≤ 0.8) single crystalline thin films have been successfully epitaxially grown on SrTiO3 (001) substrates via the pulsed laser deposition technique. Detailed X-ray diffraction and transmission electron microscopy measurements reveal the excellent c-axis and ab-plane texture of the films. As the Pb doping concentration increases, both the resistivity and the Seebeck coefficient decrease due to the increase in hole carrier concentration. The highest power factor of about 1.2 mW m−1 K−2 has been achieved in Bi0.96Pb0.06CuSeO single crystalline thin films at 673 K, which is much higher than those of polycrystalline ceramics with random orientation, suggesting that c-axis oriented BiCuSeO-based single crystalline thin films might have great potential for application in thermoelectric thin film devices.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Xing Cao,Shichang Sun,Bing Lu,Yan Liu,Rui Ma,Huiqun Cao,Hongzhi Ma,Hexun Huang
In order to overcome the shortcomings of insufficient red light component and poor thermal stability of commercial white light emitting diode (WLED), YAG:Ce, R (R: Gd 3+ , Pr 3+ , Gd 3+ and Pr 3+ ) fluorescent thin films were prepared by pulse laser deposition (PLD). The composition and microstructure, photoluminescence properties, and red-enhanced mechanism of co-doped YAG fluorescent thin films, as well as the electroluminescence behavior of the corresponding WLEDs were investigated. Results showed that the doping of Pr 3+ caused the emission spectrum energy of Ce 3+ to migrate, and an emission peak appeared at 606 nm in the red region. The doping of Gd 3+ caused the emission spectrum of Ce 3+ to shift to the red region, and the main peak position of the Ce 3+ emission spectrum is red-shifted from 523 nm to 548 nm. The YAG:Ce,Pr,Gd fluorescent film not only realized the improvement of red light components and red-shift, but also increased the energy transmission efficiency from 33.3% to 51.9%. Moreover, results of the color coordinate analysis also showed that the co-doping of Gd 3+ and Pr 3+ made the luminescence closer to the red region, reducing the color temperatures and hues changed to warm. Thus, tri-doped transparent fluorescent thin film were prospective for WLED application.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2023
·Vol. 13
·期 1
·1-11
·
IF 4.6
You Teng-Hui,Yang Wei,Hui Hao-Hao,Lei Xiang-Yang,Wang Tian-Yu,Zhang Qing-Hua,Ju Xin,Deng Xue-Ran
The purpose of this study is to analyze the damage of antireflective (AR) coating over potassium dihydrogen phosphate (KDP) crystal subjected to multi-pulse laser irradiation at low flux under vacuum. Fresh silica AR was characterized as a reference; Atomic Force Microscope (AFM), Scanning Electron Microscopy (SEM), profilometer, and Scanning Near-Field Optical Microscope Photo-induced Force Microscope (SNOM-PiFM) were employed to analyze the characteristics of coatings. The experimental results indicated that the damage of AR coating over the KDP crystal was mainly caused by partial exfoliation, which exposed silica particles beneath the surface. It was found that the accumulated tensile stress led to coating damage with the increase of laser pulse. The initial coating damage was observed to extend and interconnect to form large-area exfoliation. Splitting mechanism of SiO–Si TO 3 was observed at vibration mode peaks of 1064 cm −1 and 1096 cm −1 showing progressing irradiation damage. Based on this study, it would be helpful to suppress the damage probability of AR coating over KDP crystal applied in high-power laser systems. Moreover, the applicability of SNOM-PiFM method to study the Infrared Radiation (IR) spectra of ultra-thin coatings with transparent substrates was proposed.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Electronic Materials
·
2021
·
IF 3.314
Beilei Yuan,Haoming Wei,Jingwei Li,Yu Zhou,Fan Xu,Jinkai Li,Bingqiang Cao
In this paper, inorganic halide perovskite cesium lead bromide (CsPbBr3) films are epitaxially grown on (100)-oriented SrTiO3 substrates by pulsed laser deposition (PLD). This method has the distinctive advantages to grow high-quality films with a precise composition, designed crystalline orientation, and controlled uniform thickness. By optimizing the substrate temperatures and laser pulse numbers, (100)-CsPbBr3 films with uniform morphology are grown on a SrTiO3 substrate via a cubic-on-cubic epitaxial growth mode, which is proven by XRD investigation. Detailed photophysical spectroscopy study including femtosecond transient absorption spectra and detailed low-temperature photoluminescence spectra indicate that such epitaxial CsPbBr3 films are of very low defects in the bandgap. The temperature-dependent resistivity measurement reveals that the epitaxial CsPbBr3 films show a typical thermally activated carrier behavior with a bandgap value of 2.37 eV, which is very consistent with the optical result and indicates a quasi-intrinsic semiconductor nature of such an epitaxial film. Our results confirm that CsPbBr3 films with high crystal quality and lower defect density can be epitaxially grown with PLD for further superlattices and quantum wells.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 3
·720
·
IF 5.076
Yunjia Wang,Jianwen Wang,Qiao Wen
Owing to their unique characteristics, two-dimensional (2-D) materials and their complexes have become very attractive in photoelectric applications. Two-dimensional heterojunctions, as novel 2-D complex materials, have drawn much attention in recent years. Herein, we propose a 2-D heterojunction composed of MXene (Ti2CTx) materials and graphene oxide (GO), and apply it to an Nd:YAG solid-state laser as a saturable absorber (SA) for passive Q-switching. Our results suggest that a nano-heterojunction between MXene and GO was achieved based on morphological characterization, and the advantages of a broadband response, higher stability in GO, and strong interaction with light waves in MXene could be combined. In the passively Q-switched laser study, the single-pulse energy was measured to be approximately 0.79 µJ when the pump power was 3.72 W, and the corresponding peak power was approximately 7.25 W. In addition, the generation of a stable ultrashort pulse down to 109 ns was demonstrated, which is the narrowest pulse among Q-switched solid-state lasers using a 2-D heterojunction SA. Our work indicates that the MXene–GO nano-heterojunction could operate as a promising SA for ultrafast systems with ultrahigh pulse energy and ultranarrow pulse duration. We believe that this work opens up a new approach to designing 2-D heterojunctions and provides insight into the formation of new 2-D materials with desirable photonic properties.Keywords:MXene;saturable absorber;heterojunction;Q-switched;pulsed laser;nonlinear optics;bulk laser
研究领域:
光学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Shiguang Jin,Yunmin Zhu,Zuyun He,Huijun Chen,Xi Liu,Fei Li,Jiang Liu,Meilin Liu,Yan Chen
Low-cost transition metal oxides (TMO) has received extensive attention as new-generation oxygen evolution reaction (OER) catalysts. In recent years, introducing oxygen defects via various strategies emerged as an efficient way to increase electro-catalytic activity of TMO. Despite many successful examples, the physical and chemical origin of such enhanced OER activity induced by oxygen defects is still not well understood. In this work, we systematically investigate the correlation between the concentration of oxygen vacancies and OER activity by using a NiO thin film model system grown by pulsed laser deposition . Oxygen vacancies are introduced into NiO thin films by Ar plasma treatments with different power (50 W, 100 W, and 150 W). The OER activities of NiO thin films are found to be significantly enhanced after plasma treatment. The improvement in electrochemical OER performance is attributed to the creation of oxygen defects, which lead to the strongly modified surface adsorption properties, as confirmed by X-ray photoelectron spectroscopy and contact angle measurements . Our results demonstrate that plasma treatment as a promising method for precisely tuning physical and chemical properties of TMO through oxygen defects engineering to obtain high performance electro-catalysts.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Ruijing Wang,Peng Sun,Huanwen Wang,Xuefeng Wang
At high current density during the hydrogen evolution reaction (HER) process, the active layer for most of MoS 2 -based electrocatalysts suffers from pulverizations and easily drops-off due to a high rate of bubble formation and strong stirring. Herein, a facile pulsed laser deposition (PLD) method is used to fabricate amorphous molybdenum disulfide (MoS 2 ) films on gold-coated carbon cloth (Au/CC) for HER test. Because of the strong anchoring interaction between MoS 2 catalysts and the Au/CC substrate during the underlying laser ablation process, remarkable stability with 5000 continuous HER cycles has been achieved in the acid media. Furthermore, the as-obtained MoS 2 catalyst shows a small Tafel slope of 48 mV decade −1 , an onset overpotential of 132 mV and the overpotential of 180 mV at a current density of 10 mA cm −2 . These results demonstrate that PLD is a very promising technique for making the film electrodes for application in electrocatalytic process.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Haowei Lu,Jiaqi Lin,Haiwu Zheng
The ferroelectric properties and fatigue resistance of 47(Ba 0.7 Ca 0.3 )TiO 3 –53Ba(Zr 0.2 Ti 0.8 )O 3 (BCZT) film can be enhanced by Tb modified and adding SrTiO 3 (STO) buffer layer using pulsed laser deposition(PLD) method. The 0.4 mol% Tb doped BCZT/STO(0.4Tb-BCZT/STO) film possesses optimal comprehensive electrical properties. Comparing with traditional BCZT film gown on Pt, the residual polarization( P r ), piezoelectric coefficient( d 33 *), permittivity( ε r ) of 0.4Tb-BCZT/STO film increase from 3.6 to 9.0 μC/cm 2 , 52 to 75 pm/V, 880 to 1210 and loss(tanθ) decrease from 0.028 to 0.017(10 4 Hz), respectively. During a high electric field, the degradation of P r is only 5.8% and the increase of E c is about 6.1% in 0.4Tb-BCZT/STO film after 10 9 switching cycles, which show the excellent fatigue resistance. The improved polarization and fatigue performances of film benefits from the reduced pinning influence with lower defect concentration based on a series of experiments and theoretical simulation. This work demonstrates the potential candidates of lead-free nonvolatile memory micro-devices applied in microelectronic industry.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Bin Xie,Xiaoyuan Zhou,Wei Chen,Lining Fan,Lixin Zhang,Runqiu Li,Hui Zheng,Qiong Wu,Yanhui Wu,Yaning Lin,Peng Zheng,Liang Zheng,Yang Zhang
A high remanence ratio of hexagonal barium ferrite film is urgently needed for self-biased microwave devices. In this work, the aluminum-substituted hexagonal barium ferrite films (BaFe (12−x) Al x O 19 ) with different substituting concentrations (x = 0, 1.5, 2, 2.5, 3) were deposited on the Al 2 O 3 substrate by pulsed laser deposition method using self-sintered BaFe (12−x) Al x O 19 target. Firstly, the targets with different Al concentrations were sintered by the solid phase method and exhibited high dense, uniform microstructure, and high purity. Then, the influence of the Al ions concentration on the crystal structure, morphology, and magnetic and microwave properties of BaFe (12−x) Al x O 19 films was studied in detail. Structural characterizations confirm that the Al prefers to substitute for 2a, 4f2 and 2b sites and promotes the grain (formed as single-domain) orientation growth, which results in a decrease in the saturation magnetization, an increase of remanence ratio and anisotropy field. Consequently, a high remanence ratio of 95 % was obtained for BaFe (12−x) Al x O 19 film at x = 3, and also displays a high anisotropy field (27.7 kOe), a low saturation magnetization (1758 G) and an appropriate ferromagnetic resonance linewidth (～436 Oe), which can be applied in self-biased devices.
研究领域:
材料科学
·
磁学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 43
·11651-11658
·
IF 5.976
Yishuo Hu,Xiangbin Zeng,Tingting Ren,Shaoxiong Wu,Wenzhao Wang,Yang Zeng,Guangtong Zhou,Zhenyu Guo,Wen Jin,Shibo Wang,Yonghong Xiao,Jingjing Lu
Ultrathin 1T@2H-MoS2 films have excellent electronic and optical properties, and are potentially applicable in optics, electronics, energy storage, and sensing technology. However, identification of an efficient method to produce 1T@2H-MoS2 films with controllable thickness is challenging. This study describes the rapid synthesis (5–10 min) of 1T@2H-MoS2 thin films on Si/SiO2 substrates by a novel pulsed laser irradiation method. We verify the photodecomposition reaction model by measuring the UV-Vis absorption spectra of the reactants. The thickness of the synthesized MoS2 film can be controlled by adjusting the concentration of the precursor. Structural characterization confirms that both the 1T and 2H phases exist in the MoS2 film. The 1T phase enhances the conductive behavior of the MoS2 film and induces magnetism. Furthermore, pure 1T-MoS2 can be separated selectively from the MoS2 film under specific operating conditions using pulsed laser-induced synthesis. This approach is suitable for the synthesis of films of MoS2 and other 2D materials, including 1T phase-pure films.
研究领域:
材料科学
·
光学
·
电子学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）