表面等离子共振Ag-SnO2复合膜光学传感器

为了研究CuO的不同掺杂浓度对表面等离子共振角的影响,提出一种新型的棱镜耦合法Ag-SnO2(掺杂CuO)复合膜表面等离子共振光学传感器结构.采用射频反应溅射法在清洗处理后的金红石棱镜上依次制备Ag膜(50nm),SnO2膜(50nm),CuO和SnO2膜(50nm)4层膜结构,CuO的厚度依其不同的掺杂体积分数的不同而不同,经过退火实现SnO2薄膜的掺杂得到复合膜.以He-Ne激光62.8nm为入射激励光源,通过采用表面等离子共振实验方法,CuO的掺杂体积分数分别为0,0.01和0.05时,得到共振角分别为59.61°,60.52°和61.3°的结果.结果表明,CuO掺杂的体积分数越大,表面等离子共振的共振角越大.     

带有周期排列纳米孔结构金薄膜的散射光学性质

利用离散偶极近似的方法(DDJA),对具有周期排列纳米孔金薄膜的散射光学性质进行了研究.通过计算得到的散射光谱曲线,确定了表面等离子激元(SPPS)在增强和抑制薄膜散射性质方面起到了重要的作用,通过改变孔间距、孔数量和孔直径能够控制表面等离子激元对薄膜散射系数的影响.同时也分析了膜宽、膜厚对薄膜散射系数的影响,结果表明随着薄膜厚度的增加,表面等离子共振峰强度降低.     

表面等离子共振Ag／TiO2复合膜双光束光强归一化传感器

为了克服由于光源光强的波动而导致的表面等离子共振传感器的测量误差,提出一种双光束归一化光强的表面等离子共振检测方法,传感器的结构为金红石材料作成的棱镜作为耦合棱镜,在棱镜的底边采用射频溅射技术制作AS／TiO2复合膜,Ag膜和TiO2膜的厚度分别为50nm和100nm,在复合膜上设置待测气体的样品池。在He—Ne光入射激励下,复合膜的分界面发生表面等离子共振现象。实验结果表明：采用了双光束归一化光强检测方法,使系统的重复性、稳定性得到大大的提高,减少了测量误差。     

斜角入射沉积TiO_2薄膜的光学特性和表面粗糙度

采用电子束热蒸发技术在K9玻璃基底上以不同的沉积入射角沉积了单层TiO2薄膜,研究了不同入射沉积角沉积的TiO2薄膜的光学特性、填充密度和表面粗糙度,并比较了不同膜层厚度下薄膜表面粗糙度与入射沉积角之间的关系。研究结果表明,随着入射沉积角的增加,TiO2薄膜的透射率增加,透射峰值向短波移动,薄膜的填充密度从入射沉积角0°时的0.801降低到入射沉积角为75°时的0.341;薄膜的表面粗糙度随着入射沉积角的增加而增加,当入射沉积角为75°时,薄膜的表面粗糙度略高于基底的表面粗糙度。在沉积入射角不变时,随着膜层厚度的增加,膜层的表面粗糙度降低。     

防离子反馈膜粒子阻透率随环境温度变化的模拟研究

覆有防离子反馈膜的微通道板是第三代微光像增强器的核心部件之一。真空高温烘烤除气过程对防离子反馈膜粒子阻透特性会产生破坏性的影响。文中利用分子动力学方法模拟计算并得到Al2O3 薄膜的膜层密度随环境温度的变化规律。利用蒙特卡洛方法模拟计算了Al2O3 薄膜的电子透过率和离子阻挡率随入射粒子能量的变化曲线。得到Al2O3 薄膜的死电压在235 V 左右,同时得出防离子反馈膜离子阻挡率在入射离子能量降低后有所增加。在入射离子能量降低为250 eV 时,C、N、O 离子被Al2O3 薄膜阻挡的比率高达96%-99%。综合以上因素分析得出,随着外部温度的升高,电子透过率线性增加,而离子阻挡率非线性的下降。合理优化并调整高温烘烤时间和量值将有助于防离子反馈膜工作性能的改善。     

双金属层表面等离子体共振传感器灵敏度优化

为了优化表面等离子体共振传感器的灵敏度,基于薄膜光学理论,分析了银-金双金属层表面等离子体共振传感器的反射率和灵敏度随金属薄膜厚度变化的规律。发现在满足共振角反射率小于1%的条件下,银膜和金膜厚度存在一定的取值范围; 在此厚度范围内,传感器的灵敏度随着金属薄膜（银膜与金膜）厚度的增大而提高,灵敏度增量最大可达5°/RIU。结果表明,在保证一定共振角反射率的前提下,可通过增加双金属层中金属薄膜的厚度提高双金属层表面等离子体共振传感器的灵敏度。     

等离子腐蚀Al和Al-Si合金膜存在的一些问题

通常,Al和Al-Si合金膜在大规模集成电路中作为金属互连线而被广泛采用。在Al和Al-Si合金膜中精确形成微细图形的技术,对高密度、高速度的LSI来说,是必不可少的。在各种腐蚀薄膜的方法中,平行板电极反应器中的等离子腐蚀,是薄膜中形成高分辩率图形最有效的方法之一。 平行板电极反应器等离子腐蚀技术,已由一些科技工作者研究出来。众所     

Al薄膜对(002)ZnO/Al/Si结构基片中ZnO薄膜特性影响的实验研究

采用射频磁控溅射法沉积制备了(002)ZnO/A l/Si复合结构。研究了Al薄膜对(002) ZnO/Al/Si复合结构的声表面波器件(SAWD)基片性能影响以及当ZnO 薄膜厚度一定时的Al膜最佳厚度。采用X射线衍射(XRD)对Al和ZnO薄膜进行了结构表征 ,采用 扫描电镜(SEM)对ZnO薄膜进行表面形貌表征,并从薄膜生长机理角度进行了分析。结果 表明,加Al薄膜有利于ZnO薄膜按(002)择优取向生长,并且ZnO 薄膜的结晶性能提高;与(002)ZnO/Si结构基片相比,当Al薄膜 厚为100nm时,(002)ZnO/Al/Si结构中ZnO薄 膜的机电耦合系数提高 了65%。     

近阈值能量密度下薄膜的激光损伤特点

采用毫米量级大光斑的近单模的激光器 ,控制入射薄膜表面的激光能量 ,获得了几种常见单层膜和增透膜的损伤形貌 ,实验结果表明 ,薄膜的损伤可区分为熔化型和应力型两种 ,薄膜表面等离子体对损伤斑点的扩大有重要作用。     

光盘反射层纳米A1膜性能研究

利用原子力显微镜（AFM）和椭圆偏振仪研究了溅射条件对纳米Al薄膜性能的影响。研究表明，随溅射Ar气压的增大，纳米Al膜的表面粗糙度增加，折射率降低，反射率减小，这与薄膜的结构变化密切相关；随溅射功率的增大，纳米Al膜的表面粗糙度增加，而其光学常数的变化则不明显。     

准分布式光纤表面等离子体波传感器

研究了一种基于波分复用原理的准分布式光纤表面等离子体波传感器。应用光波导理论和多层膜反射理论分析了表面等离子体波效应在同一光纤探头中连续被激励的原理及其传感模型。通过数值模拟和相应实验分别考察了蒸镀调制层对表面等离子体波共振(SPR)效果的影响,并在此基础上给出了设计的一般步骤和原则。实验结果表明,蒸镀不同厚度的Ta2O5薄膜将导致表面等离子体波共振光谱发生偏移,且随着膜厚增加而逐渐发生红移;当液体折射率n0处于1.333~1.388之间时,蒸镀有Ta2O5薄膜的光纤表面等离子体波传感器波长灵敏度达到2235 nm/RIU(Refractive Index Unit);通过在一支光纤探头上依次加工两个表面等离子体波传感区域,实现了对光波信号的连续调制。     

基于光表面等离子波共振的矿井瓦斯检测技术研究

针对矿井瓦斯检测中存在的问题,采用单芯光纤耦合的反射式光束偏转法检测技术,结合Ag/SnO2金属复合薄膜与瓦斯气体接触后发生气敏化学反应,将引起SnO2薄膜的折射率发生变化和等离子表面波共振角移动的性质,提出了一种新的瓦斯检测方法.该方法利用白光光源在覆有选择性气体吸附复合薄膜的表面激发表面等离子波,用单芯光纤耦合的反射式光束偏转法对所激发表面等离子波信息进行采集,并准确检测出环境中甲烷气体的体积分数;用最小二乘法对数据进行拟合,提高了检测精度.由仿真曲线证明,本瓦斯检测方法为瓦斯监测方法提供了一种新途径.     

Controlling Surface Plasmon Optical Transmission with an Electrochemical Switch Using Conducting Polymer Thin Films

Surface plasmon resonance (SPR)‐enhanced optical transmission is actively controlled by an electrochromism of conducting polymer thin films. Polyaniline and poly(3,4‐ethylenedioxythiophene) thin films are deposited on a thin gold grating surface. SPR‐enhanced optical transmission is demonstrated by irradiating white light on the conducting polymer thin film–gold grating surface and detecting the transmitted light from the back side. The transmission SPR system is combined with an electrochemical setup to manipulate the resonance. The wavelength of the sharp peak in the transmission light spectra is tuned by electrochemical doping/dedoping of the conducting polymer thin films. The present study of controllable SPR‐enhanced optical transmission should provide novel active plasmonic devices such as active bandpass filters or biosensors.     

Optical constants detection in tin dioxide nano-size layers by surface plasmon resonance investigation

Optical constants of tin dioxide nano-size layers were detected using surface plasmons resonance research technique. Squared reflectance indexes difference as well as the ones with s- and p-polarized light are measured simultaneously. Obtained in the work the refraction coefficient of the tin dioxide film gives the possibility to judge about the structural perfection of the layer and confirms that the film has significant porosity, which is created during the decomposition of the polymer materials used as structuring additives. It is shown that the resonance condition for surface plasmons may be destroyed through the interaction of surface plasmons with surface roughness potential of the film (medium dielectric properties variation).     

Optical Enhancement via Electrode Designs for High‐Performance Polymer Solar Cells

To capture the essence of the rapid progress in optical engineering exploited in high‐performance polymer solar cells (PSCs), a comprehensive overview focusing on recent developments and achievements in PSC electrode engineering is provided in this review. To date, various kinds of electrode materials and geometries are exploited to enhance light‐trapping in devices through distinct optical strategies. In addition to the widely used nanostructured electrodes that induce plasmonic‐enhanced light absorption, planar ultra‐thin metal films also have attracted significant attention due to their remarkably reflective transparent properties that beget efficient optical microcavities. These microcavities confine incident light with resonant frequencies between two reflective electrodes due to optically coherent interference, boosting the light absorption of thin‐film PSCs while maintaining efficient charge dissociation and extraction. After reviewing the challenges in developing high‐performance microcavity‐enhanced PSCs (MCPSCs), we discuss strategies to improve MCPSC performance further to showcase the potential of harnessing microcavity resonance effects in thin‐film PSCs.     

Optical Transmission Properties and Electric Field Distribution of Interacting 2D Silver Nanorod Arrays

Silver nanorods have been grown by electrodeposition into thin film porous alumina templates (AAO). Optical transmission measurements using p‐polarized incident white light shows clear plasmon resonance extinction peaks. We successfully model the dependence on angle in incidence of extinction peak height and position using a multiple–multipoles (MMP) approach with the different spectral features being clearly associated with the effective electric field distribution and coupling between individual nanorods.     

基于表面等离子体共振成像的指纹采集

指纹识别技术是方便、可靠、非侵害和价格低廉的生物识别技术。为提高图像的质量,根据表面等离子体共振(SPR)的原理,提出采用表面等离子体共振成像(SPRI)采集指纹图像的方法。介绍了表面等离子体共振成像采集指纹图像的原理、自行组建的表面等离子体共振成像指纹采集系统的结构。采用Kretschmann型棱镜耦合结构激励表面等离子体共振,偏振的平面光经棱镜投射到传感片,发生表面等离子体共振现象。由CCD摄像机采集反射光指纹图像。分别用表面等离子体共振成像方法和传统光学方法采集了同一指纹的图像。两图中主要区域指纹脊和谷的对比度分别为0.2014和0.0516。表面等离子体共振成像方法采集的指纹图像的对比度和清晰度显著提高。     

High-performance and stability bifacial flexible self-powered perovskite photodetector by surface plasmon resonance and hydrophobic treatments

Flexible semitransparent photodetectors based on perovskites provide merits in terms of light weight and bifacial advantages but suffer from poor stability. To simultaneously enhance the performance and stability of flexible perovskite photodetectors (PPDs), silver (Ag) nanoparticles are incorporated to improve the responsiveness through the surface plasmon resonance (SPR) effect in the bulk of perovskite layer, and block copolymer F68 is employed to increase the surface hydrophobicity of perovskite film to keep long-term stable devices. Ag@polyvinyl pyrrolidone (PVP) core shell structure enables the sufficiently enhanced film light absorption and device quantum efficiency following the SPR response curve, the amphiphilic F68 make the perovskite less vulnerable to humid ambient exposure. Moreover, the sputtered transparent indium tin oxide back electrode enables the double facial operability of our flexible self-powered photodetectors with a bifacial factor of 80% and improved stability as well. Addressing the poor responsiveness and instability issues extends the potential broad applications of our bifacial flexible perovskite photodetectors.