放大／小自聚焦透镜列阵的研制

本文讨论了放大／缩小自聚焦镜列阵成像原理。根据设计方程、确定了列阵的主要参数，制成了列阵样品，并对样品的参数进行测量。     

折射型微透镜列阵的光刻热熔法研究

研究了制作折射型微透镜列阵的一种新方法光刻胶热熔成形法，获得了２０×２０的折射型微透镜列阵，单元微透镜相对口径为Ｆ／２，单元透镜直径为９０μｍ，中心间隔１００μｍ，透镜的波像差小于１．３波长。本文详细阐述了光刻热熔法的基本原理及微透镜设计方法，并讨论了工艺参数对微透镜列阵质量的影响。     

用光敏玻璃制作微透镜列阵

对特种光敏玻璃及其微透镜列阵的成型机理及制作工艺进行了研究。采用六角密排结构，在远紫外线下曝光，问时进行热循环处理，成功制作出直径为４００μｍ、表面凸起高度达９．０μｍ的微透镜列阵。     

三种不同端面光纤列阵和半导体激光列阵耦合的(数值)模拟

半导体激光列阵的输出光束有较大的发散角和较强的不对称性，极大地限制了其在各领域中的应用。为了改善半导体激光列阵输出光束的质量，必须采用特殊的光学系统进行光束整形。一种简单有效的方法是利用光纤列阵实现光束由线性排列到圆形排列的转换。对三种特殊制备的光纤列阵和半导体激光列阵的耦合特性进行了数值模拟研究。结果显示，相对于球形端面光纤列阵和锥形端面光纤列阵，球顶锥形端面光纤列阵和半导体激光列阵有着更高的耦合效率(90％以上)。此外，利用球顶锥形端面光纤列阵还可以进一步压缩输出光束的发散角，从而获得更高质量的输出光束。     

半导体激光器列阵与光纤的连接

半导体激光器具有体积小、重量轻、效率高、寿命长、使用方便等许多优点，在泵浦固体激光器、材料加工、空间光通信、高速记录、激光诊断、激光治疗等方面有广泛的应用［１，２］，同时也推动了半导体激光器列阵的研究．人们期望激光器列阵不仅具有大的功率输出，而且应用...     

多层膜线列阵的巨磁电阻和层间耦合

研究了Fe/［NiFe/Cu］₃₀多层膜线列阵的室温磁电阻和磁滞特性，列阵的线密度为250和500线/mm，采用激光全息光刻和离子束刻蚀技术制成.线列阵样品的磁性与刻线加工前的连续膜有明显区别.最大巨磁电阻率有增也有减，最大增量为3.32%.外场平行线轴的矫顽力有的增加有的不变.这除了因为原始连续膜层间耦合态有差异之外，还与由线列阵加工引入的单轴各向异性和其它变化相关. 关键词：     

可变焦列阵柱面透镜均匀线聚焦系统

用两个列阵柱面透镜与非球面透镜组成变焦线聚焦系统，能将入射激光束会聚成辐照均匀、长度连续可调的焦线，它可用于Ｘ光激光实验研究．文中详细分析了焦线上光场分布的情况，给出了物理光学分析的结果，并与巳有技术作了比较．     

非制冷测辐射热计焦平面列阵现状

本文介绍非制冷测辐射热计焦平面列阵的现状，已制成含有８×１０４个非制冷长波红外探测器的焦平面列阵的热像仪，系统的噪声等效温差（ＮＥＴＤ）为０．０４℃，不需要制冷和机械调制入射辐射。非制冷热像传感器可用于保安和轻武器热瞄具，也可用于手持热像监视装置。     

焦线可调光楔列阵系统的研制

针对原形光楔列阵均匀线聚焦光学系统线长不可调的缺点，研制了可连续改变焦线宽纵比的光楔列阵系统，详细分析了它的工作原理，并作了实验验证，得到二者相一致的结果。     

湍流对M×N列阵双曲余弦高斯光束传输和远场光束质量的影响

基于广义惠更斯-菲涅耳原理,并采用光束的非相干合成方法,推导出了M×N双曲余弦高斯列阵光束在湍流中的三维光强传输方程．采用桶中功率、β参量和Strehl比作为光束质量的评价参量,研究了湍流大气对双曲余弦高斯列阵光束远场光束质量的影响．研究表明：在湍流大气中,双曲余弦高斯列阵光束的传输将经历三个阶段的变化,并且湍流使得光束传输经历三阶段的进程加快;湍流导致双曲余弦高斯列阵光束扩展、最大峰值光强下降,但是,β参量随光束数目M（N）、相邻子光束间距xc（yd）和光束参量δ的增加而减少,即光束扩展受湍流的影响减小;并且,存在最佳xd（yd）和δ值使得Strehl比取得极大值．因此,适当选取M（N）、xd（yd）和δ可以降低湍流对双曲余弦高斯列阵光束远场光束质量的影响．     

自聚焦透镜列阵的设计原理与制造

讨论了自聚焦透镜及其列阵成像的规律.根据所需列阵的共轭距离,分辨率等确定单根自聚焦透镜的几何尺寸和光学参数,设计出复印机用的自聚焦透镜列阵.最后,对列阵的制造作了初步介绍.     

Top-gathering pillar array of hybrid organic–inorganic material by means of self-organization

Two-dimensional (2D) pillar arrays with submicrometer to micrometer repetitions have been fabricated from hybrid organic–inorganic material by mask lithography or multi-beam interference lithography. The type of array structure depends on structural parameters such as the pillar height, diameter and distance between neighboring pillars. Two kinds of periodic arrays, 2D arrays and ‘top-gathering’ arrays, can be obtained by controlling the structural parameters. In the top-gathering arrays, the pillars are gathered at the top by means of self-organization, and ‘top-gathering’ units composed of four pillars can be formed. PACS 68.35.Gy; 81.20.Fw; 82.50.-m     

The transient scattering mechanism of dipole array with reflector

The transient backscattering mechanisms of a dipole array with reflector have been investigated from different aspects： time-domain, frequency-domain, and combined time-frequency domain, using 4 × 8 dipole arrays with reflector as an example. The data of scattering from the arrays under the incidence of Gaussian pulses are obtained by finite differential time domain method. The influences of the array structural parameters, incident wave parameters, and incident angles on the waveforms, spectrum, and time-frequency representations of the backscattered fields of the arrays are analysed and conclusions are drawn. From these characteristics and conclusions, it is possible to deduce the array structure inversely from the backscattered field.     

Enhanced UV/blue fluorescent sensing using metal-dielectric-metal aperture nanoantenna arrays

Subwavelength aperture antenna arrays are designed and fabricated for potential applications in fluorescence sensing in the near UV/blue range. They are designed using finite-difference time-domain (FDTD) simulation, fabricated using focused ion beam etching and characterised using angular Fourier spectroscopy. The aperture arrays are formed in the top layer of an aluminum-silica-aluminum trilayer and produce a maximum simulated field intensity enhancement of 5.8 times at 406 nm and highly directive emission with a beamwidth of 8.3 deg. The normal incidence reflection response has been measured and shows reasonable agreement with modelled results. In addition, to investigate higher field intensity enhancements, bowtie aperture arrays are simulated and the influence of parameters such as dielectric gap, position of dipole source, and aperture shape and size are discussed and show enhancements up to 67 times are possible.     

光子晶体微波加速结构的计算与设计

用有限差分法计算了由金属棒分别按方形和三角形晶格分布的二维光子晶体的色散曲线, 得出了带隙图．计算结果表明: 对于三角形晶格, 当金属棒半径和棒间距比值小于0.2时, 由该种光子晶体构成的微波加速结构可约束主模、抑制高次模; 用Microwave Studio软件模拟计算了三角形晶格分布的二维光子晶体加速结构, 研究了新加速结构的RF参数与结构尺寸的关系, 优化出一组RF频率为9.37GHz时此种加速腔的结构尺寸, 计算还表明该种新加速结构具有较高的分路阻抗和品质因数.     

Controlling the self-organization of InAs quantum dots upon growth by means of vapor-phase epitaxy on an antimony δ-doped GaAs buffer layer

This work examines the possibility of controlling the parameters of InAs/GaAs quantum dot arrays obtained by metal-organic chemical vapor deposition (MOCVD) at atmospheric pressure with using antimony as a surfactant. The possibility of controlling the parameters and optical properties of InAs quantum dot arrays by varying the surface concentration of Sb atoms in a GaAs buffer layer surface is demonstrated. A model of quantum dot array formation in the presence of Sb atoms is proposed.     

Growth mechanism studies of ZnO nanowire arrays via hydrothermal method

Well-controlled ZnO nanowire arrays have been synthesized using the hydrothermal method, a low temperature and low cost synthesis method. The process consists of two steps: the ZnO buffer layer deposition on the substrate by spin-coating and the growth of the ZnO nanowire array on the seed layer. We demonstrated that the microstructure and the morphology of the ZnO nanowire arrays can be significantly influenced by the main parameters of the hydrothermal method, such as pH value of the aqueous solution, growth time, and solution temperature during the ZnO nanowire growth. Scanning electron microscopy observations showed that the well oriented and homogeneous ZnO nanowire arrays can be obtained with the optimized synthesis parameters. Both x-ray diffraction spectra and high-resolution transmission electron microscopy (HRTEM) observations revealed a preferred orientation of ZnO nanowires toward the c-axis of the hexagonal Wurtzite structure, and HRTEM images also showed an excellent monocrystallinity of the as-grown ZnO nanowires. For a deposition temperature of 90 °C, two growth stages have been identified during the growth process with the rates of 10 and 3 nm/min, respectively, at the beginning and the end of the nanowire growth. The ZnO nanowires obtained with the optimized growth parameters owning a high aspect ratio about 20. We noticed that the starting temperature of seed layer can seriously influence the nanowire growth morphology; two possible growth mechanisms have been proposed for the seed layer dipped in the solution at room temperature and at a high temperature, respectively.     

Radiation Properties of Carbon Nanotubes Antenna at Terahertz/Infrared Range

The geometric structure and the terahertz/infrared radiation characteristics of carbon nanotubes dipole antenna arrays have been investigated by CST MICROWAVE STUDIO based on finite integral methods. In terahertz and infrared frequency span, the antenna properties such as electrical field distributions, scattering parameters, standing wave ratio, gain, and two dimension directivity patterns are discussed. Our results show that N × N antenna arrays have higher radiation efficiency than single carbon nanotube dipole antenna. This work was supported by National Natural Science Foundation of China (60571026, 10396160).     

Magnetic optical bifunctional CoPt_3/Co multilayered nanowire arrays

CoPt3/Co multilayered nanowire(NW) arrays are synthesized by pulsed electrodeposition into nanoporous anodic aluminum oxide(AAO) templates. The electrochemistry deposition parameters are determined by cyclic voltammetry to realize the well control of the ratio of Co to Pt and the length of every segment. The x-ray diffraction(XRD) patterns show that both Co and CoPt3 NWs exhibit face-centered cubic( fcc) structures. In the UV-visible absorption spectra,CoPt3/Co NW arrays show a red-shift with respect to pure CoPt3 NWs. Compared with the pure Co nanowire arrays, the CoPt3/Co multilayered nanowire arrays show a weak shape anisotropy and well-modulated magnetic properties. CoPt3/Co multilayered nanowires are highly encouraging that new families of bimetallic nanosystems may be developed to meet the needs of nanomaterials in emerging multifunctional nanotechnologies.     

Diffractive Microlens Array Monolithic Integration with PtSi Focal Plane array

Diffractive microlens arrays can completely collect the light at the focal plane and concentrate it into a smaller spot size on the detector plane, the photodetector area can be substantially reduced. Increased gamma radiation hardening and noise reduction result from the decrease in photodetector sensitive area. The diffractive microlens arrays have been designed by considering the correlative optical and processing parameters for PtSi focal plane array. They have been fabricated on the backside of PtSi focal plane array chip by successive photolithography and Ar⁺ ion-beam-etching technique. The alignment of microlens array with PtSi focal plane array was completed by a backside aligner with IR light source. The practical processes and fabrication method are discussed. The performance parameters of PtSi FPA with diffractive microlens array are presented.