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Ultra-fast diagnosis of shock waves and plasma at front and rear surfaces in the bulk of fused silica induced by an Nd:YAG pulse laser

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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. *** 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

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： Xiangxian Wang Jian Zhang Jiankai Zhu Zao Yi Jianli Yu 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 *** 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 *** transmission spectra and electric field distributions of the structure were obtained via the finite-difference time-domain *** obtained the optimal structural parameters after optimizing the geometrical *** the optimal parameters,the figure of merit(FOM)values of the two Fano resonances reached 1.7×10^(4)and 3.9×10^(3),*** 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

Coating of microbially produced calcium carbonate onto stone materials

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Science China(Technological Sciences) 2015年第2期58卷 266-272页

作者： ZHU Wen Kun MU Tao ZHANG You Kui DUAN Tao LUO Xue Gang Engineering Research Center of Biomass Materials Ministry of Education Southwest University of Science and Technology China Academy of Engineering Physics joint laboratory for extreme conditions matter properties Southwest University of Science and Technology and Research Center of Laser FusionCAEP

The coatings of microorganism-induced calcium carbonate onto the stone surface carried out by using both of the immersion method and coating method were investigated. Various analysis and testing techniques such as scanning electron micrograph （SEM） and X-ray diffraction （XRD） were used to characterize the deposited mineral layer. The adhesive property, acid re- sistance, frost resistance, light and aging resistance, water adsorption and permeability were investigated in detail. The results showed that both immersion method and coating method could produce calcium carbonate granules with sizes ranging from 1 to 10 pm and form a layer of dense mineralization membrane which is about 50 to 100 pm thick. Immersion method was more efficient than coating method. The large cohesive force between calcium carbonate layer and stone materials could improve the acid rain resistance as well as excellent heat tolerance, frost resistance and light aging resistance. The coating process could not only help the stone materials maintain its original permeability with the aid of calcium carbonate layers but also improve the penetration resistance significantly. Therefore, this type of technology shows a great potential in the protection of stone relics.

关键词： microorganism microbially induced deposited-layer stone materials

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： Yunping Qi Baohe Zhang Jinghui Ding Ting Zhang Xiangxian Wang Zao Yi 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 *** 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 *** two proposed1-bit coding metasurfaces demonstrate that the reflected terahertz beam can be redirected and arbitrarily *** 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 ***,two kinds of orbital angular momentum(OAM)vortex beams with different moduli are generated by a coding metasurface using different coding *** 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

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： Xiangxian Wang Jiankai Zhu Yueqi Xu Yunping Qi Liping Zhang Hua Yang Zao Yi 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 *** reflection spectra and the electric field distributions are obtained via the finite-difference time-domain *** simulation results show that multiple surface plasmon resonance modes can be excited in this novel ***,one of the resonance modes shows appreciable potential in refractive index sensing due to its wide range of action with the environment of the *** 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

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： Xiu-Lu Zhang Yun-Xia Han Hong Jia Nuo Qu Zhong-Li Liu 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： elastic anisotropy Hugoniot states extreme conditions

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 *** 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 ***,the ambient air temperature builds a bridge for the comparison of the effect between the cell temperature and the illumination intensity on solar cell *** on the experimental results,the reasons which cause the difference of the environment temperatures dependence are analyzed.

关键词： Si solar cell cell temperature ambient air temperature illumination intensity cell performance

Alkali-metal(Li, Na, and K)-adsorbed MoSi_(2)N_(4) monolayer: an investigation of its outstanding electronic, optical, and photocatalytic properties

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Communications in Theoretical Physics 2022年第1期74卷 96-104页

作者： Zhiyuan Sun Jing Xu Nsajigwa Mwankemwa Wenxing Yang Xianwen Wu Zao Yi Shanjun Chen Weibin Zhang School of Physics and Optoelectronic Engineering Yangtze UniversityJingzhou 434023China School of Chemistry and Chemical Engineering Jishou UniversityJishou 416000China joint laboratory for extreme conditions matter properties Southwest University of Science and TechnologyMianyang 621010China

Single-layer MoSi_(2)N_(4),a high-quality two-dimensional material,has recently been fabricated by chemical vapor *** by this latest experimental work,herein,we apply first principles calculations to investigate the electronic,optical,and photocatalytic properties of alkali-metal(Li,Na,and K)-adsorbed MoSi_(2)N_(4) *** electronic structure analysis shows that pristine MoSi_(2)N_(4) monolayer exhibits an indirect bandgap(E_(g)=1.89 eV).By contrast,the bandgaps of one Li-,Na-,and K-adsorbed MoSi_(2)N_(4) monolayer are 1.73 eV,1.61 eV,and 1.75 eV,***,the work function of MoSi_(2)N_(4) monolayer(4.80 eV)is significantly reduced after the adsorption of alkali metal *** work functions of one Li-,Na-,and K-adsorbed MoSi_(2)N_(4) monolayer are 1.50 eV,1.43 eV,and 2.03 eV,***,optical investigations indicate that alkali metal adsorption processes substantially increase the visible light absorption range and coefficient of MoSi_(2)N_(4) ***,based on redox potential variations after alkali metals are adsorbed,Li-and Na-adsorbed MoSi_(2)N_(4) monolayers are more suitable for the water splitting photocatalytic process,and the Li-adsorbed case shows the highest potential application for CO_(2) *** conclusion,alkali-metal-adsorbed MoSi_(2)N_(4) monolayer exhibits promising applications as novel optoelectronic devices and photocatalytic materials due to its unique physical and chemical properties.

关键词： MoSi_(2)N_(4) first-principles alkali metal adsorbed electronic structure optical properties photocatalysis

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 Zr2A1C at high pressure and high temper- ature are investigated by first principles density functional theory method. The calculated lattice parameters of Zr2A1C are in good agreement with the available theoretical data. The pressure dependences of the elastic constants, bulk modulus, shear modulus, Young＇s mod- ulus, and Vickers hardness of Zr2A1C 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 Griineisen parameter at high pressure and temperature are predicted for the first time.

关键词： Elastic property Thermodynamic property Density functional theory