共查询到18条相似文献,搜索用时 171 毫秒
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利用含聚合物添加剂的前驱体溶液,通过重复甩胶镀膜—热处理工艺制备了PbZrB0.4BTiB0.6B0.6OB3(PZT)和BaTi0.9Sr0.1BO3(BST)铁电多层膜.在特定的波长范围,每个多层膜具有高达90%的光学反射率,且峰值反射率随生长次数的增加而增大.显微技术分析表明每个多层膜是由一系列厚度几乎相等的致密层和厚度也近乎相同的多孔层交替排列形成的一维周期性结构.重点分析了这种周期性结构的可能形成机理,它涉及相分离和高分子聚合物热解两个过程. 相似文献
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FTO玻璃衬底上锆钛酸铅多层膜的微结构与光学特性 总被引:1,自引:1,他引:0
应用化学溶液沉积法,在涂布氟掺杂SnO2的玻璃衬底上制备了具有16个周期的PbZr0.4Ti0.6O3多层膜,并对其微结构与光学性能进行了研究.测试表明,玻璃基底上的PbZr0.4Ti0.6O3多层膜具有均匀、平整、致密和无裂纹的表面形貌,呈现出由致密层和多孔疏松层交替排列构成的层状结构,且具有单一钙钛矿相.在350~900nm的波长范围内,反射光谱曲线上存在一个中心波长位于450nm、带宽约为41nm、峰值反射率超过91%的高反射率带;与反射光谱相对应,在相同频段的透射光谱曲线上出现了一个与反射带等宽、中心波长位于450nm的透射谷,谷的最小透过率小于6%.这项研究进展对拓展铁电多层膜的应用范围将有积极作用. 相似文献
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研究了特异结构锆钛酸铅PbZr0.38Ti0.62O3(PZT)多层膜的铁电和介电特性.同均一相PZT薄膜材料相比,由致密层和多孔层交替排列形成的近周期PZT多层膜具有铁电、介电增强效应.在100V极化电压下,多层膜的平均剩余极化强度达42.3μC/cm2,矫顽场为43kV/cm.大的极化强度值归因于大的膜厚和多孔结构有效释放膜内张应力的结果.室温低频限下,PZT多层膜的表观相对介电常数超过2000.极为有趣的是,在所研究的频率范围,PZT多层膜具有两种截然不同的介电驰豫.低频介电损耗峰源自空间电荷极化;而遵从Arrhenius律的高频介电响应可能同与氧空位Vo"相关的极性缺陷复合体有关. 相似文献
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介绍用不同折射率和相同有效光学厚度的两层交替膜(ZnS和MgF_2)作基本材料制成的无损失交替介质多层激光反射镜。当偏振光垂直或平行于入射面时,计算了这种反射镜抑止带中心的反射率和抑止带宽度随入射角的变化。文中附图详细讨论了用计算机计算的反射镜(膜层数达20层)的结果。这些曲线图可根据预定的技术要求简化激光反射镜的设计,并可用来区别抑止带中心的最大或最小光谱反射率。 相似文献
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“长波长软X射线多层膜的设计与制备”这篇论文介绍了用离子束溅射法制备长波长软X射线多层膜的研究工作,并报道了一种新的材料组合C/Si用于28.4nm(43. 65eV)和30.4nm(40.78 eV)波段的多层膜反射镜,并且用离子束溅射装置制备了正入 射条件下的C/Si多层膜反射镜.同时,用软X射线反射计测量了样品的反射率,从实验结果看出,制备的多层膜样品在28.4nm和30.4nm波段附近的实测正入射反射率分别达到11.4%和14.3%,实验指标达到了国内领先水平,并接近了国际水平. 相似文献
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为研究合金在连续激光辐照过程中反射率变化机理,建立了积分球反射率测量装置,测量了1.06 m 连续激光辐照过程中45 号钢反射率变化。实验结果表明,激光辐照过程中反射率先快速下降,然后产生周期波动。随着激光功率增大,反射率开始下降点和最小值点对应温度逐渐升高,极大值个数增多。建立了多层氧化膜影响模型,结合氧化膜生长规律,分析了不同结构、不同厚度变化规律氧化膜层的反射率特征,实验结果验证了理论模型的合理性。结果表明,反射率变化主要原因是氧化膜生长引起的多光束干涉与吸收效应。由FeO-Fe3O4-Fe2O3 组成的三层氧化膜中,中间吸收型Fe3O4膜是反射率变化的主要影响因素,最外层Fe2O3 膜引起的干涉效应影响反射率的稳定值,最内层FeO膜的贡献可以忽略。 相似文献
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K. A. Kilian T. Böcking S. Ilyas K. Gaus W. Jessup M. Gal J. J. Gooding 《Advanced functional materials》2007,17(15):2884-2890
We describe the development and optimization of porous silicon photonic crystal surface chemistry towards implantable optical devices. Porous silicon rugate filters were prepared to obtain a narrow linewidth reflectivity peak in the near‐infrared (700–1000 nm) with low background reflectivity elsewhere. The morphology of the mesoporous structures (pore diameter < 50 nm) was such that only small proteins could infiltrate the pores whereas larger proteins were excluded. To provide stability in biological media, we established an approach to build organic multilayers containing hexa(ethylene oxide) moieties in porous silicon. The optical changes associated with organic derivatization were monitored concurrently with FTIR characterization. Furthermore, the antifouling capability of our chemical strategy is assessed and the penetration of different sized proteins into the structure was determined. The structural stability in biological environments was evaluated by incubation in human blood plasma over time while monitoring the optical signature of the photonic crystal. 相似文献
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We demonstrate a laser-diode(LD)pumped actively Q-switched laser with Nd:Sc0.2Y0.8Si O5(Nd:SYSO)crystal for the first time.A stable actively Q-switched laser is obtained at dual wavelengths of 1 075.2 nm and 1 078.2 nm.The maximum average output power of 720 m W is obtained at the repetition rate of 15 k Hz under the pump power of8.7 W.The minimum pulse width of 58 ns is obtained at the repetition rate of 5 k Hz under the pump power of 8.7 W,corresponding to the peak power of 1.9 k W and the pulse energy of 112μJ. 相似文献
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本文提出了一种计算磁光多层结构光学特性的新方法,它可以用来计算包含有一层或多层磁性薄膜的磁光多层结构的反射率、Kerr角及椭圆度等光学特性,并得到了应用. 相似文献
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L. N. But’ko V. D. Buchel’nikov I. V. Bychkov V. G. Shavrov 《Journal of Communications Technology and Electronics》2008,53(1):90-99
The effect of the exchange interaction between ferromagnet (FM) layers via conduction electrons of conducting interlayers on the equilibrium conditions, reflectivity, and integral susceptibility of an FM/nonmagnetic-conductor/FM layered structure is theoretically investigated. Frequency and field dependences of the reflection coefficient of electromagnetic waves and the integral susceptibility are obtained and analyzed for structures containing different numbers of layers and for the cases of interacting and noninteracting FM layers. It is shown that the resonant behavior of the structure’s reflection coefficient can be controlled through variation of the values of the exchange interaction between the layers and the layers’ thicknesses. 相似文献