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Surface Plasmon Resonance and Raman Scattering Activity of the Au/AgxO/Ag Multilayer Film

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Chinese Physics Letters 2014年第4期31卷 147-149页

作者： ZHONG Yu-Ting CHENG Zi-Qiang MA Liang wang Jia-Hong HAO Zhong-Hua wang qu-quan Key Laboratory of Artificial Micro- and Nano-structures of the Ministry of Education and School of Physics and Technology Wuhan University Wuhan 430072

The nanostructured Au/AgxO/Ag sandwich multilayer films on quartz substrates are prepared by the magnetron sputtering method. The morphology, plasmon resonance and surface enhanced Raman scattering （SERS） activi- ties of the multilayer films are studied. The resonant absorption wavelength of localized surface plasmon is tuned in a wide range from 618nm to 993nm by controlling the density of nanoparticles of Au and Ag. The SERS activity of the Au/AgxO/Ag multilayer films are enhanced over -10 times compared with those of bare Ag and bare Au films. These properties may find a potential application in biosensor and bioimaging.

关键词： Multilayer Film Surface magnetron

Optical Bloch Equations Modified with Phonon-Induced Intensity-Dependent Dephasing

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Communications in Theoretical Physics 2007年第2X期48卷 335-338页

作者： ZHOU Guang-Hua LI Yao-Yi CHENG Mu-Tian LIU Shao-Ding wang qu-quan Department of Physics Wuhan University Wuhan 430072 China State Key Laboratory for Surface Physics Institute of Physicsthe Chinese Academy of Sciences Beijing 100080 China

We extend the exciton population equations of a two-level quantum dot system with weak excitation to the ones with strong excitations, in which, the phonon-induced intensity-dependent dephasing time and decay rate are involved. The straightforward calculated populations from the modified population equations demonstrate the damping behavior of Rabi oscillation as the external field increasing. The effect of the intensity-dependent dephasing time and the intensity-dependent decay rate are also discussed.

关键词： decoherence dephasing optical Bloch equation quantum dot

The Fluorescence Dynamics of Chlorophyllαand Sodium Magnesium Chlorophyllin

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Chinese Physics Letters 2013年第9期30卷 194-197页

作者： wang Ya-Lan ZHOU Zhang-Kai PENG Xiao-Niu ZHOU Li HAO Zhong-Hua wang qu-quan Department of Physics Wuhan UniversityWuhan 430072 School of Physics and Engineering SunYat-Sen UniversityGuangzhou 510275

The concentration dependence of the fluorescence spectra and lifetimes of chlorophyll𝑏and sodium magnesium chlorophyllin are compared to explore the influences of intramolecular relaxation and intermolecular interaction of chlorophylls on the fluorescence *** different concentrations of chlorophyll𝑏and sodium magnesium chlorophyllin in the suspensions,three different fluorescence emission bands are *** inter-actions increase as the concentrations increase,which lead to redshifts in both fluorescence and lifetime ***,the lifetime is increased by re-absorption in the sodium magnesium chlorophyllin *** observations increase the understanding of the light harvesting and energy relaxation mechanisms of chlorophyll molecules.

关键词： magnesium relaxation lifetime

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等离激元共振能量转移与增强光催化研究进展

物理学报 2019年第14期68卷 112-126页

作者：周利王取泉武汉大学物理科学与技术学院人工微结构教育部重点实验室武汉430072 美国佐治亚理工学院生物医学工程系美国亚特兰大30332 武汉大学高等研究院武汉430072

等离激元共振能量转移指表面等离激元将俘获的能量通过偶极-偶极相互作用转移到邻近的半导体或分子等激子体系中,它是等离激元非辐射弛豫的一个通道,也可作为获取和利用等离激元共振能量的一种方式.此外,等离激元能量还可以通过热电子弛... 详细信息

等离激元共振能量转移指表面等离激元将俘获的能量通过偶极-偶极相互作用转移到邻近的半导体或分子等激子体系中,它是等离激元非辐射弛豫的一个通道,也可作为获取和利用等离激元共振能量的一种方式.此外,等离激元能量还可以通过热电子弛豫(非辐射)和光散射(辐射)等方式耗散.等离激元各个弛豫通道之间存在着很强的关联,相关的能量转移和电荷转移过程可以将等离激元耗散的能量输送到其他体系或转换为其他能量形式.本文主要介绍了等离激元共振能量转移和与其相关的能量和电荷转移过程(包括等离激元近场增强及耦合、远场散射、热电子弛豫等)的物理机制和动力学性质,并详细介绍了这些机制在增强光催化研究领域的最新进展.

关键词：表面等离激元光催化能量转换电荷转移

激子自旋弛豫对简并量子点发射光子对纠缠度的影响

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物理学报 2007年第8期56卷 4924-4929页

作者：刘绍鼎程木田王霞王取泉武汉大学物理系武汉430072

利用粒子数运动方程和量子回归理论,计算了单个半导体量子点双激子体系脉冲激发下粒子在各能级间辐射跃迁的二阶交叉相关函数以及系统发射光子对的偏振密度矩阵.分析了激子态能级简并量子点体系发射光子对偏振纠缠特性,讨论了纠缠度随... 详细信息

利用粒子数运动方程和量子回归理论,计算了单个半导体量子点双激子体系脉冲激发下粒子在各能级间辐射跃迁的二阶交叉相关函数以及系统发射光子对的偏振密度矩阵.分析了激子态能级简并量子点体系发射光子对偏振纠缠特性,讨论了纠缠度随激子态间自旋弛豫的变化关系.研究表明,激子自旋弛豫会破坏该系统发射光子对的纠缠度.

关键词：纠缠光子对半导体量子点二阶相关函数

生物大分子杂化处理的CdSe/ZnS核/壳量子点多层膜的超快三阶非线性研究

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物理学报 2006年第2期55卷 753-757页

作者：丁沙王小慧杜予民王取泉武汉大学物理系武汉430072 武汉大学资源与环境科学学院武汉430072

利用静电自组装技术,以生物大分子材料壳聚糖杂化处理具有稳定结构的CdSe/ZnS核/壳量子点,形成复合多层薄膜.与薄膜的吸收谱线比较,在375nm飞秒激光激发下测量的量子点的光致发光谱存在Stokes位移.采用Z扫描技术,利用790nm飞秒激光研究... 详细信息

利用静电自组装技术,以生物大分子材料壳聚糖杂化处理具有稳定结构的CdSe/ZnS核/壳量子点,形成复合多层薄膜.与薄膜的吸收谱线比较,在375nm飞秒激光激发下测量的量子点的光致发光谱存在Stokes位移.采用Z扫描技术,利用790nm飞秒激光研究了其三阶非线性吸收和折射特性,发现饱和吸收信号来自CdSe/ZnS量子点,而自聚焦的折射信号则部分来自壳聚糖.测出多层膜的三阶非线性系数分别是β=6·5×10^(-6)cm/W,n2=1·5×10^(-10)cm2/W.

关键词： CdSe/ZnS量子点非线性性能光致发光谱

Macro-mechanics and Microstructure of Nanomaterial-modified Geopolymer Concrete: A Comprehensive Review

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 204-214页

作者： wang Tao FAN Xiangqian GAO Changsheng qu Chiyu The National Key Laboratory of Water Disaster Prevention Nanjing Hydraulic Research InstituteNanjing 210024China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China School of Water Conservancy and Transportation Zhengzhou UniversityZhengzhou 450001China

We have described in detail the effects of nano-SiO_(2),nano-CaCO_(3),carbon nanotubes,and nano-Al_(2)O_(3) on geopolymer concrete from the perspectives of macro mechanics and *** existing research results show that the mechanism of nano-materials on geopolymer concrete mainly includes the filling effect,nucleation effect,and bridging effect,the appropriate amount of nano-materials can be used as fillers to reduce the porosity of geopolymer concrete,and can also react with Ca(OH)2 to produce C-S-H gel,thereby improving the mechanical properties of geopolymer *** optimum content of nano-SiO_(2) is between 1.0%and 2.0%.The optimum content of nano-CaCO_(3) is between 2.0%and 3.0%.The optimum content of carbon nanotubes is between 0.1%and 0.2%.The optimum content of nano-Al_(2)O_(3) is between 1.0%and 2.0%.The main problems existing in the research and application of nanomaterial-modified geopolymer concrete are summarized,which lays a foundation for the further application of nanomaterial in geopolymer concrete.

关键词： nanomaterials low carbon geopolymer concrete macro-mechanics microstructure

Prediction and optimization of flue pressure in sintering process based on SHAP

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 346-359页

作者： Mingyu wang Jue Tang Mansheng Chu quan Shi Zhen Zhang School of Metallurgy Northeastern UniversityShenyang 110819China Liaoning Low-Carbon Steelmaking Technology Engineering Research Center Northeastern UniversityShenyang 110819China Engineering Research Center of Frontier Technologies for Low-Carbon Steelmaking(Ministry of Education) Shenyang 110819China

Sinter is the core raw material for blast *** pressure,which is an important state parameter,affects sinter *** this paper,flue pressure prediction and optimization were studied based on the shapley additive explanation(SHAP)to predict the flue pressure and take targeted adjustment ***,the sintering process data were collected and processed.A flue pressure prediction model was then constructed after comparing different feature selection methods and model algorithms using SHAP+extremely random-ized trees(ET).The prediction accuracy of the model within the error range of±0.25 kPa was 92.63%.SHAP analysis was employed to improve the interpretability of the prediction *** effects of various sintering operation parameters on flue pressure,the relation-ship between the numerical range of key operation parameters and flue pressure,the effect of operation parameter combinations on flue pressure,and the prediction process of the flue pressure prediction model on a single sample were analyzed.A flue pressure optimization module was also constructed and analyzed when the prediction satisfied the judgment *** operating parameter combination was then *** flue pressure was increased by 5.87%during the verification process,achieving a good optimization effect.

关键词： sintering process flue pressure shapley additive explanation prediction optimization

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Cu离子注入石英玻璃及退火后的透射率研究

武汉大学学报（自然科学版） 2001年第1期47卷 95-98页

作者：曹旸蒋昌忠王取泉范湘军武汉大学物理科学与技术学院湖北武汉430072

将剂量分别为 1× 10 16,3× 10 16,5× 10 16,10× 10 16个 /cm2 的Cu离子注入石英玻璃 ,注入后在可见光区域均可观察到明显的吸收增强效应 ,当注入剂量达到 5× 10 16个 /cm2 及以上时可以观察到位于 5 70nm附近的吸收峰 ,吸收强度随... 详细信息

将剂量分别为 1× 10 16,3× 10 16,5× 10 16,10× 10 16个 /cm2 的Cu离子注入石英玻璃 ,注入后在可见光区域均可观察到明显的吸收增强效应 ,当注入剂量达到 5× 10 16个 /cm2 及以上时可以观察到位于 5 70nm附近的吸收峰 ,吸收强度随剂量的增加而增加 .将 4个样品经退火处理后 ,吸收普遍增加且吸收峰向长波方向移动 ,注入 3×10 16个 /cm2 的样品也出现了吸收峰 .吸收峰的存在表明注入后有Cu的纳米晶体生成 ,且退火后Cu的纳米晶体成核生长导致共振吸收加强 .

关键词：离子注入透射率铜石英玻璃金属纳米颗粒退火吸收增强效应