王永昌
红外上转换和光存储材料的研究及其应用;纳米金属粒子的光学性质及纳米结构组装体系的研究;原子分子的高激。
个性化签名
- 姓名:王永昌
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学术头衔:
博士生导师
- 职称:-
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学科领域:
光学
- 研究兴趣:红外上转换和光存储材料的研究及其应用;纳米金属粒子的光学性质及纳米结构组装体系的研究;原子分子的高激。
王永昌,西安交大理学院教授,博士生导师;中国物理学会原子与分子物理专业委员会委员;中国科学院瞬态光学技术国家重点实验室学术委员会委员;《大学物理》杂志编委。教育部专业物理与应用物理教学指导组成员。西安交通大学理学院现代物理研究所所长。1992年获国务院政府特殊津贴。
研究领域:红外上转换和光存储材料的研究及其应用;纳米金属粒子的光学性质及纳米结构组装体系的研究;原子分子的高激。
主要成果:对激光等离子体中斯塔克增宽和电子密度的关系进行了实验测定;首次测定了Be+离子的光电离截面;在真空紫外区辨认和分类了一系列新谱线;对复合泵浦类锂电离子软X射线激光作了较精确计算;研制成功一种电子俘获材料,并在国际上首次获得了电子俘获材料超快红外脉冲响应时间为14.3PS的测量结果。在纳米金属粒子光学性质方面在国内外著名学术杂志发表了40多篇论文。
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2204
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445
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成果数
10
【期刊论文】Two novel polarization transformers using rotatable waveplates
王永昌, Junli Wang, *, Qiang Fang, Yongchang Wang
Optik 116(2005)93-98,-0001,():
-1年11月30日
Two novel polarization transformers, quarter-quarter-half and half-quarter-quarter, comprising two-quarter waveplates (QWP) and a half waveplate (HWP) realizing transformation between arbitrary states of polarization (SOP) are investigated using a geometry method in this work. The expressions of azimuths of each waveplate in two polarization transforms are derived in Stokes space. Compared to the matrix treatment methods, the geometry method proposed in this paper is simple and explicit.
State of polarization (, SOP), , Waveplates, Poincare sphere, Transformations of state of polarization
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【期刊论文】The analysis of the 3p photoabsorption spectra of Ca Ⅲ by multichannel quantum defect theory
王永昌, Liang Liang a, b, ∗, Yongchang Wang a, Zhou Chao b
Physics Letters A 339(2005)89-95,-0001,():
-1年11月30日
The 3p photoabsorption spectra of Ca Ⅲ are analyzed with multichannel quantum defect theory (MQDT). Fitting MQDT parameters to minimize deviation between the observed and theoretical energy values, we have determined the MQDT parameters (μα,Uiα) for J=1 odd-parity MQDT model and using these parameters we predict the energies and Landé g factors of 3p5nd(3/2, 3/2) (7≤n≤31), 3p5nd(3/2, 5/2)(12≤n≤31), 3p5nd(1/2, 3/2)(11≤n≤18), 3p5ns(1/2, 1/2)(12≤n≤19), 3p5ns(3/2, 1/2)(13≤n≤32) and autoionized energy levels of 3p5ns(1/2, 1/2) (20≤n≤24) and 3p5nd(1/2, 3/2)(19≤n≤23). Some assignments of levels are changed.
Rydberg states, MQDT, Land
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【期刊论文】Simulation of the medium dielectric constant dependent optical properties for gold nanosphere
王永昌, Jian Zhu ∗, Yongchang Wang, Liqing Huang
Materials Chemistry and Physics 93(2005)383-387,-0001,():
-1年11月30日
Suspended gold nanospheres have been synthesized via electrochemical method. UV-vis spectra and fluorescence emission spectra have been studied at room temperature. Numerical calculations based on quasi-static, scattering and local field theories were developed to describe these optical properties. With the increasing dielectric constant of surrounding medium from 1.0 to 2.0, both local field enhancement factor and absorption wavelength maximum red shift in a linear way. However, the wavelength maximum of scattering cross-section depends on the surrounding medium dielectric constant in a nonlinear fashion.
Nanospheres, Absorption, Scattering, Fluorescence emission, Dielectric constant
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【期刊论文】Electrochemical synthesis and fluorescence spectrum properties of silver nanospheres
王永昌, Zhu Jian a, *, Zhu Xiang b, Wang Yongchang a
Microelectronic Engineering 77(2005)58-62,-0001,():
-1年11月30日
Silver colloidal nanospheres have been synthesized via electrochemical method. The absorption spectrum features show two peaks at 410 and 470nm, which result from transverse and longitudinal surface plasmon resonance, respectively. Two kinds of fluorescence emission peaks are observed. The shorter wavelength peaks fixed at about 315nm are due to the local field enhancement and the longer wavelength peaks red shift with the increasing excitation wavelength, which results from the electron interband transitions.
Silver, Nanospheres, Absorption, Fluorescence, Surface plasmon resonance, Local field enhancement
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49浏览
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【期刊论文】Shape dependent resonance light scattering properties of gold nanorods
王永昌, Jian Zhu a, ∗, Liqing Huang a, Junwu Zhao a, Yongchang Wang a, Yanrui Zhao a, Limei Hao a, Yimin Lu b
Materials Science and Engineering B 121(2005)199-203,-0001,():
-1年11月30日
Suspended gold nanorods with mean aspect ratio 2.5 have been synthesized via electrochemical method. Resonance scattering properties have been studied. Two scattering peaks fixed at 400 and 640nm are due to the scattering of the gold nanorods via coupling to the transverse and longitudinal surface plasmon resonance. The quasi-static calculation results indicate that with the increasing aspect ratio of the nanorods, the longer wavelength scattering peak red shifts linearly and the shorter wavelength peak blue shifts non-linearly. When aspect ratio a/b=1.0, ellipse degenerate to sphere and the two peaks unite into one peak at 450nm.
Nanorods, Surface plasmon resonance, Scattering, Aspect ratio, Quasi-static
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45浏览
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459下载
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【期刊论文】Two-photon absorption-induced 4F9/2→6H15/2 fluorescence of dysprosium ions
王永昌, Junwu Zhao, Liqing Huang, Yongchang Wang, Jian Zhu *
Physica B 362(2005)103-107,-0001,():
-1年11月30日
Fluorescence spectra of a solution containing Dy3+ ions have been measured at room temperature. The excitation spectrum features show a great peak at 350nm when the detection wavelength is fixed at 483 nm. Meanwhile another weaker peak takes place at 630nm, which is owing to two-photon absorption. Therefore, as the excitation wavelength is fixed at 320nm and 630 nm, respectively, both single-photon and two-photon absorption induced fluorescence emission peaks are observed. Furthermore, the emission excited by 630nm is more intense. When silver colloids are added to the solution containing Dy3+, the enhancements of two-photon absorption induced fluorescence are more intensive. We believe that these enhanced fluorescence are due to the local field enhancement around Dy3+ ions owing to the induced surface plasmon resonance of silver nanoparticles.
Fluorescence, Two-photon absorption, Dysprosium ions, Silver nanoparticles, Local field
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73浏览
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109下载
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【期刊论文】Fluorescence spectra characters of silver-coated gold colloidal nanoshells
王永昌, Zhu Jian a, ∗, Wang Yongchang a, Lu Yimin b
Colloids and Surfaces A: Physicochem. Eng. Aspects 232(2004)155-161,-0001,():
-1年11月30日
Aqueous solutions containing a high yield of suspended pure silver, pure gold and silver-coated gold nanoshells have been synthesized via an electrochemical method. UV-vis absorption spectra and fluorescence emission spectra have been measured at room temperature. The absorption spectra show two peaks at 445 and 485 nm, which due to the plasmon resonance of silver-coated gold nanoparticles. Fluorescence emission peaks have been observed in the wavelength region of 550-700nm. The emission peak corresponding to solid silver particles is more intensive than the peaks corresponding to silver-coated gold nanoshells and solid gold particles. The relationship between relative thickness of silver shell and fluorescence intensity has been illuminated from the quasi-static and local field theory. With decreasing the thickness of silver shell, the maximum of local field enhancement factor decrease and red shifts nonlinearly.
Colloidal nanoshells, Plasmon resonance, Fluorescence emission spectra, Absorption spectra, Local field
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153下载
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【期刊论文】Fluorescence Spectrum Characteristics of Gold Nanorods *
王永昌, ZHU Jian**, WANG Yong-Chang, YAN Shi-Nong
(CHIN. PIIYS. LETT. Vol.21, No.3 (2004) 559,-0001,():
-1年11月30日
Aqueous solutions containing a high yield of suspended gold nanorods with mean aspect ratio 2.5 have been synthesizeed via an electrochemical method. The fluoresconco emission peaks fixed at 37Onm and 67Onm are due to the local field enhancement via coupling to the transverse and longitudinal urface plasmon resonarce. The qUasi-static calculation results indicate that with the increasing aspect ratio of the nanorods, the longer wavelength emission peak decreases and red shifts, wheresas the shorter wavelenth emission peak blue shifts slightly.
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【期刊论文】Resonance light scattering characters of core-shell structure of Au-Ag nanoparticles
王永昌, Jian Zhu a, ∗, Yongchang Wang a, Liqing Huang a, Yimin Lu b
Physics Letters A 323(2004)455-459,-0001,():
-1年11月30日
Nanoparticles containing gold cores and silver shells have been synthesized via electrochemical method. The resonance light scattering spectrum has been studied at room temperature. Scattering features show two peaks at 370 nm and 570 nm, which result from the scattering of solid silver nanoparticles and silver coated gold nanoparticles, respectively. The calculation results based on quasi-static theory indicate that with the increasing ratio of the core radius to the total radius of the compound nanoparticles, the peak of scattering cross section decreases first then increases and reaches the minimum when the ratio is about 0.5. And meanwhile the scattering peak red shifts nonlinearly. Furthermore, with the increasing dielectric constant of surrounding medium, the scattering peak increases monotonic and red shifts.
Gold, Silver, Core-shell structure, Nanoparticles, Scattering, Quasi-static theory
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177下载
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王永昌, Binghai Yan, Yang Yang, and Yongchang Wang*
J. Phys. Chem. B 2003, 107, 9159,-0001,():
-1年11月30日
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