脉冲激光加热下材料的温度场研究

通过改变多种参数对单脉冲激光加热下材料温度场进行研究.     

产生纳米级暗中空光束的方法研究

用时域有限差分法，给出光纤头近场区电场强度模的空间分布.讨论了当光纤纤芯分别取不同尺寸时，对此空间光场强度的影响.要想得到较大范围的暗中空光束，必须增加光纤纤芯尺寸.并且，对光纤纤芯尺寸取一较大值和光纤中空区域尺寸取一较小值时的情况进行讨论，可得在光纤头附近可以出现与光纤中空区域尺寸大小相当的暗斑(10¹ nm量级).但是，暗中空光束中背景光较强.为此，将光纤的空心设计为金属. 发现此时中心暗斑的背景光明显减弱，在近场区域可获得较为理想的暗中空光束.如进一步缩小光纤中空区域尺寸，可以在光纤头附近获得暗斑更小甚至纳米量级的暗中空光束.为获得一种纳米量级的暗中空光束提供一种方法.     

超对称Bullough－Dodd模型的prolongation分析

在扭曲仿射代数A2^(2)上建立了超对称的Bullough-Dodd模型。Prolongation方法的研究表明，该模型承认一个Lax pair，从Lax意义上证明该模型可积。另外，当该超对称模型的所有费米量为零时，该系统就定义了一个新奇的由单标量玻色场指数相互作用构成的可积模型。这个发现还打破了长久以来的一种认识；只有sinh-Gordon和标准Bullough-Dodd模型是Liouville模型。     

An analog of double electromagnetically induced transparency with extremely high group indexes

An asymmetric metamaterial exhibiting an analog of double electromagnetically induced transparency(EIT) in the middle-infrared region is reported.The metamaterial consists of two-layered arrays of Ushaped rings embedded in a medium,with the lower layer rotated by 90°.Our simulations demonstrate that both maximum group indexes are extremely high at the two EIT-like positions.The group index reaches about thrice the currently reported maximum value at the high-frequency EIT-like position.The transmittance at the two transparency positions also possesses extremely high Q factors,which is conducive to controlling the propagation of electromagnetic waves.     

基于虚拟示波器动态判别溶液浓度

根据液滴对光具有会聚的特点以及溶液浓度与其折射率有定量的对应关系，设计了基于虚拟示波器动态判别溶液浓度的光电测量方法．     

共建科教协同产业平台促生的光电专业个性化人才培养构建与实践

面对传统工科专业人才培养体系存在的教师发展途径单一、学生培养程式化等问题,以江苏师范大学光电信息科学与工程专业为例,在充分调研的基础上,通过与地方政府共建产业研究院,打造科研产业并举的“双型导师群”,凝练“个性化人才培养”发展方向,开展“双一流”师资队伍建设,形成了有特色、满足光电产业需求的人才培养模式,充分实践和论证了个性化人才培养模式的制定方案.结果表明,该培养模式已具备一定的推广价值和应用意义.     

Properties of the 3D photonic nanojet based on the refractive index of surroundings

We exhibit a three-dimensional （3D） photonic nanojet based on a dielectric microsphere irradiated by a plane wave with the finite-difference time-domain （FDTD） method. We investigate the influence of the refractive index of the surrounding on the properties of the nanojet by simulating the electric field distributions in it. The simulation results show that, by optimally choosing the size of the sphere and the ratio of the refractive indices of the sphere and the surrounding, the focus point can occur just on the surface of the sphere even if the refractive index of the surrounding is changed. Additionally, the peak amplitude of the nanojet increases with increasing the refractive index of the surrounding. However, the decay length and the jet width of the nanojet decrease simultaneously. These effects may have potential applications in observation or manipulation of nano-objects such as antibodies in biology. In nanojet-enabled optical data storage, the photonic nanojet may be also helpful for improving data-storage capacities and retrieval speed by controlling the field amplitude, the decay length, and jet width of the nanojet.     

多层超薄薄膜介质光热辐射的三维理论研究

在柱坐标系下，以热传导方程及边界条件为基础，通过Hankel变换及逆变换，得到多层热单介质膜中的温度场.以特殊参数为例，对膜层为三层时的特殊情况进行讨论，得知对于高热 扩散率的薄膜材料，纵向和横向的热导率比值越大，相位的变化也越大.低热扩散率薄膜材 料，不同的纵向和横向的热导率比对光热信号的影响很小.同时，光吸收系数越小，频率变 化对相位影响越明显. 关键词： 多层 热单介质膜 温度场     

Negative Refraction of a Symmetrical π-shaped Metamaterial

A symmetrical π-shaped metamaterial is investigated. Numerical simulations exhibit the negative-refractive property of this structure. The complex refractive index n, wave impedance z, effective permittivity ε and effective permeability μ have been retrieved from the simulated S parameters. The negative-refractive band lies between 11.2 GHz and 13.05 GHz. The frequency band with high transmission with low loss occurs between 11.95 GHz and 12.5 GHz, which is helpful for practical applications. The mechanism of the electromagnetic resonance is also revealed.     

高灵敏银纳米棒阵列对农药啶虫脒的表面增强拉曼散射快速检测

The determination of pesticide residue on agricultural products is increasingly important.Exposure to pesticides can cause severe acute reactions in humans,including aplastic anemia and leukemia.In this work,we developed a rapid and sensitive method to detect acetamiprid pesticide residue based on surface-enhanced Raman scattering.Silver nanorod (AgNR) arrays were fabricated by oblique angle deposition technology and were used as SERS substrates.Prior to detection,the AgNR arrays were cleaned with nitric acid solution or a mixture of methanol and acetone.Compared to the unwashed AgNR arrays,the AgNR arrays washed with methanol and acetone shows a signal enhancement 1000 times greater than the unwashed AgNR array due to the effective removal of the impurities on its surface.The limit of detection of acetamiprid was determined to be 0.05 mg/L.In addition,the molecular structure of acetamiprid was simulated and the corresponding vibration modes of the characteristic bands of acetamiprid were calculated by density function theory.To demonstrate its practical application,the AgNRs array substrates were applied successfully to the rapid identification of acetamiprid residue on a cucumber''s surface.These results confirmed possibility of utilizing the AgNRs SERS substrates as a new method for highly sensitive pesticide residue detection.