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Chinese Optics Letters 2016年第5期14卷 52-56页

作者：周强邱荣蒋勇高翔杨永佳王慧丽任欢 Joint Laboratory for Extreme Conditions Matter Properties Southwest University of Science and Technology

We investigate the dynamic processes of the Nd：YAG pulse laser ablation of fused silica by ultrafast time- resolved optical diagnosis with a nanosecond time resolution. The evolution process of plasma expansion in air and shock waves propagation in the bulk are both obtained with spatial and temporal resolutions. Laser-induced damage in the bulk of fused silica with filaments and shock waves are observed. Thermoela.stic wave, mechanical wave, and shock wave dependence on the laser fluence and intensity of the plasma are analyzed. The shock pressure P and temperature T calculated through the measured shock velocity D and the Hugoniot data of fused silica are measured.

关键词： Laser ablation Laser damage Neodymium lasers Plasma diagnostics Shock waves Silica

Molecular Dynamics Simulations of the Elastic Anisotropy of Pd at extreme conditions

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Communications in Theoretical Physics 2018年第6期69卷 735-740页

作者：张修路韩运侠贾红曲诺刘中利 Laboratory for Extreme Conditions Matter Properties Southwest University of Science and Technology621010 Mianyang China College of Physics and Electric Information Luoyang Normal University Luoyang 471022 China

It is very interesting to discover the elastic properties of engineering material palladium, especially its elastic anisotropy along Hugoniot states. We here investigate the evolution of its high pressure and temperature(PT) elastic ansotropy along Hugoniot using molecular dynamics simulations based on accurate classical interatomic potential. In order to testify the validity of the interatomic potential of Pd in describing the high PT elastic properties, we calculate its isothermal and adiabatic elastic moduli using molecular dynamics method. The obtained data are in good agreement with experimental data. From the isothermal elastic constants, we deduce the Hugoniot acoustic velocities and find that the resulting data are in good agreement with experimental acoustic velocity data. Based on the reliable elastic constants, we further investigate the spacial elastic ansotropy along Hugoniot PT states. It is found that the spacial elastic anisotropy of Pd increases along Hugoniot states.

关键词：动力学模拟弹性 Hugoniot 极端条件 Pd 分子动力学计算试验性

A novel plasmonic refractive index sensor based on gold/silicon complementary grating structure

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Chinese Physics B 2021年第2期30卷 313-318页

作者：王向贤朱剑凯徐月奇祁云平张丽萍杨华易早 School of Science Lanzhou University of TechnologyLanzhou 730050China College of Physics and Electronic Engineering Northwest Normal UniversityLanzhou 730070China Joint Laboratory for Extreme Conditions Matter Properties Southwest University of Science and TechnologyMianyang 621010China

A novel complementary grating structure is proposed for plasmonic refractive index sensing due to its strong resonance at near-infrared wavelength.The reflection spectra and the electric field distributions are obtained via the finite-difference time-domain method.Numerical simulation results show that multiple surface plasmon resonance modes can be excited in this novel structure.Subsequently,one of the resonance modes shows appreciable potential in refractive index sensing due to its wide range of action with the environment of the analyte.After optimizing the grating geometric variables of the structure,the designed structure shows the stable sensing performance with a high refractive index sensitivity of 1642 nm per refractive index unit(nm/RIU)and the figure of merit of 409 RIU^(-1).The promising simulation results indicate that such a sensor has a broad application prospect in biochemistry.

关键词： plasmonic sensor gold silicon grating

Efficient manipulation of terahertz waves by multi-bit coding metasurfaces and further applications of such metasurfaces

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Chinese Physics B 2021年第2期30卷 336-343页

作者：祁云平张宝和丁京徽张婷王向贤易早 College of Physics and Electronic Engineering Northwest Normal UniversityLanzhou 730070China School of Science Lanzhou University of TechnologyLanzhou 730050China Joint Laboratory for Extreme Conditions Matter Properties Southwest University of Science and TechnologyMianyang 621900China

Benefiting from the unprecedented superiority of coding metasurfaces at manipulating electromagnetic waves in the microwave band,in this paper,we use the Pancharatnam-Berry(PB)phase concept to propose a high-efficiency reflectivetype coding metasurface that can arbitrarily manipulate the scattering pattern of terahertz waves and implement many novel functionalities.By optimizing the coding sequences,we demonstrate that the designed 1-,2-,and 3-bit coding metasurfaces with specific coding sequences have the strong ability to control reflected terahertz waves.The two proposed1-bit coding metasurfaces demonstrate that the reflected terahertz beam can be redirected and arbitrarily controlled.For normally incident x-and y-polarized waves,a 10 d B radar cross-section(RCS)reduction can be achieved from 2.1 THz to5.2 THz using the designed 2-bit coding metasurface.Moreover,two kinds of orbital angular momentum(OAM)vortex beams with different moduli are generated by a coding metasurface using different coding sequences.Our research provides a new degree of freedom for the sophisticated manipulation of terahertz waves,and contributes to the development of metasurfaces towards practical applications.

关键词： coding metasurface Pancharatnam-Berry phase multiple beams radar cross-section(RCS)reduction orbital angular momentum

Influence of secondary treatment with CO_2 laser irradiation for mitigation site on fused silica surface

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Chinese Physics B 2016年第10期25卷 475-481页

作者：蒋勇周强邱荣高翔王慧丽姚彩珍王俊波赵鑫刘春明向霞祖小涛袁晓东苗心向 Joint Laboratory for Extreme Conditions Matter Properties Southwest University of Science and Technology School of Physical Electronics University of Electronic Science and Technology of China Research Center of Laser Fusion China Academy of Engineering Physics

The ablation debris and raised rim, as well as residual stress and deep crater will be formed during the mitigation of damage site with a CO2 laser irradiation on fused silica surface, which greatly affects the laser damage resistance of optics. In this study, the experimental study combined with numerical simulation is utilized to investigate the effect of the secondary treatment on a mitigated site by CO2laser irradiation. The results indicate that the ablation debris and the raised rim can be completely eliminated and the depth of crater can be reduced. Notable results show that the residual stress of the mitigation site after treatment will reduce two-thirds of the original stress. Finally, the elimination and the controlling mechanism of secondary treatment on the debris and raised rim, as well as the reasons for changing the profile and stress are analyzed. The results can provide a reference for the optimization treatment of mitigation sites by CO2laser secondary treatment.

关键词： fused silica CO_2 laser numerical simulation secondary treatment

The anisotropy of hexagonal close-packed iron under inner core conditions: the effect of light elements

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Earth and Planetary Physics 2022年第4期6卷 399-423页

作者： Wei Zhang Mei Tang ZhenWei Niu Laboratory for Extreme Conditions Matter Properties Southwest University of Science and TechnologyMianyang Sichuan 621010China Fundamental Science on Nuclear Wastes and Environmental Safety laboratory Southwest University of Science and TechnologyMianyang Sichuan 621010China School of National Defense Science&Technology Southwest University of Science and TechnologyMianyang Sichuan 621010China

In recent decades,global seismic observations have identified increasingly complex anisotropy of the Earth’s inner core.Numerous seismic studies have confirmed hemispherical variations in the inner core’s anisotropy.Here,based on ab initio molecular dynamics calculations,we report how the anisotropy of hexagonal close-packed(hcp)-iron,under inner core conditions,could be altered when alloyed with light elements.We find that light elements in binary allows with iron-hcp-Fe-X(X=C,O,Si,and S)-could have significant effects on density,sound velocities,and anisotropy,compared with the behavior of pure hcp-iron;the anisotropy of these binary alloys depends on combined effects of temperature and the particular alloying light element.Furthermore,the change in anisotropy strength with increasing temperature can be charted for each alloy.Alloying pure iron with some light elements such as C or O actually does not increase but decreases core anisotropy at high temperatures.But the light element S can significantly enhance the elastic anisotropy strength of hcp-Fe.

关键词： iron elastic constants anisotropy inner core

The influence of environment temperatures on single crystalline and polycrystalline silicon solar cell performance

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Science China(Physics,Mechanics & Astronomy) 2012年第2期55卷 235-241页

作者： WEN Cai FU Chao TANG JinLong LIU DeXiong HU SiFu XING ZhiGang School of Science Laboratory for Extreme Conditions Matter PropertiesSouthwest University of Science and TechnologyMianyang 621010China Epilight Technology Co. Ltd.Shanghai 201203China

The influence of the cell temperature (named interior environment temperature) and ambient air temperature (named exterior environment temperature) on the open-circuit voltage,short-circuit current,and output power has been carefully studied for the Si solar cells.The results show that one of the environment temperatures plays the major role,and the temperature dependence of device performance parameters is different for single crystalline and polycrystalline Si solar cells.Furthermore,the ambient air temperature builds a bridge for the comparison of the effect between the cell temperature and the illumination intensity on solar cell performance.Based on the experimental results,the reasons which cause the difference of the environment temperatures dependence are analyzed.

关键词：多晶硅太阳能电池环境温度电池性能单晶温度依赖性空气温度开路电压电池温度

Pressure Effect on Elastic and Lattice Dynamic properties of Beryllium Selenide from First Principles

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Journal of Wuhan University of Technology(Materials Science) 2017年第2期32卷 378-381页

作者：罗雰 GUO Zhicheng CAI Lingcang Laboratory for Extreme Conditions Matter Properties Southwest University of Science and Technology Mianyang 621900 China National Key laboratory for Shock Wave and Detonation Physics Research Institute of Fluid Physics Chinese Academy of Engineering Physics Mianyang 621900 China

The lattice dynamic, elastic, and thermodynamic properties of Be Se were investigated with first principles calculations. The phase transition pressure from the zinc blende（B3） to the nickel arsenide（B8） structure of Be Se was determined. The elastic stability analysis suggests that the B3 structure Be Se is mechanically stable in the applied pressure range of 0-50 GPa. Our lattice dynamic calculations show that the B3 structure is lattice dynamically stable under high pressure. Within the quasiharmonic approximation, the thermodynamic properties including the constant volume heat capacity and constant pressure heat capacity are predicted.

关键词： lattice dynamic elastic properties density functional theory

Ab initio Predictions of Structural and Thermodynamic properties of Zr2AIC Under High Pressure and High Temperature

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Chinese Journal of Chemical Physics 2015年第3期28卷 263-268,I0001页

作者： Fen Luo Zhi-cheng Guo Xiu-lu Zhang Chang-ying Yuan Ling-cang Cai Laboratory for Extreme Conditions Matter Properties Southwest University of Science and Technol- ogy Mianyang 521900 China National Key laboratory for Shock Wave and Detonation Physics Research Institute of Fluid Physics Chinese Academy of Engineering Physics Mianyang 521900 China

The structural and thermodynamic properties of Zr2AlC at high pressure and high temperature are investigated by first principles density functional theory method. The calculated lattice parameters of Zr2AlC are in good agreement with the available theoretical data. The pressure dependences of the elastic constants, bulk modulus, shear modulus, Young's modulus, and Vickers hardness of Zr2AlC are successfully obtained. The elastic anisotropy is examined through the computation of the direction dependence of Young's modulus. By using the quasiharmonic Debye model, the thermodynamic properties including the Debye temperature, heat capacity, volume thermal expansion coefficient, and Grüneisen parameter at high pressure and temperature are predicted for the first time.

关键词：热力学性质高温高压从头预测结构压力依赖性密度泛函理论弹性各向异性回火温度

Refractive index sensing of double Fano resonance excited by nano-cube array coupled with multilayer all-dielectric film

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Chinese Physics B 2022年第2期31卷 372-379页

作者：王向贤张健朱剑凯易早余建立 School of Science Lanzhou University of TechnologyLanzhou 730050China Joint Laboratory for Extreme Conditions Matter Properties Southwest University of Science and TechnologyMianyang 621010China School of Electronic Engineering Chaohu UniversityChaohu 238000China

We propose a hybrid structure of a nano-cube array coupled with multilayer full-dielectric thin films for refractive index sensing.In this structure,discrete states generated by two-dimensional grating and continuous states generated by a photonic crystal were coupled at a specific wavelength to form two Fano resonances.The transmission spectra and electric field distributions of the structure were obtained via the finite-difference time-domain method.We obtained the optimal structural parameters after optimizing the geometrical parameters.Under the optimal parameters,the figure of merit(FOM)values of the two Fano resonances reached 1.7×10^(4)and 3.9×10^(3),respectively.These results indicate that the proposed structure can achieve high FOM refractive index sensing,thus offering extensive application prospects in the biological and chemical fields.

关键词： Fano resonance refractive index nano-cube array all-dielectric film