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《中国光学与应用光学文摘》2007,(1)
O4372007010310聚酰亚胺/SiO2杂化材料的硅核磁共振波谱和电光性质的研究=Study of29Si MAS NMR spectroscopy and electro-optic property based on polyi mide/Si O2[刊,中]/邱凤仙(江苏大学化学化工学院.江苏,镇江(212013)),周钰明…//感光科学与光化学.—2006,24(1).—55-60采用溶胶-凝胶(Sol-Gel)法合成了聚酰亚胺/Si O2杂化材料。采用固态29Si MA SNMR谱研究了含氟聚酰亚胺/Si O2杂化材料的交联结构。采用衰减全反射(ATR)测定了聚酰亚胺和杂化材料在832nm处的电光系数,其值分别为32、28、34和29pm/V,结果表明其具有较高的… 相似文献
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介绍了偏振差分反射光谱的原理,并结合半导体材料平面内光学各向异性的来源,总结了偏振差分反射光谱作为一种重要的表面、界面分析技术在半导体材料研究中的应用,并分析指出其在Si基材料电光改性研究中将会起到重要作用。 相似文献
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由电场引起的晶体折射率的变化称为晶体的电光效应,具有电光效应的晶体称为电光晶体。利用电光效应可以制作电光Q开关等重要光电器件。晶体的电光效应及其有效利用,均与其对称性密切相关。本文在综述电光晶体研究进展的基础上,推导了不同晶系中各晶类电光效应类型及其特点,并以电光Q开关的要求为例讨论了晶体的电光效应及其对称性之间的关系。从讨论结果得出:立方晶系Td-ˉ43m,三方晶系C3v-3m,四方晶系D2d-4ˉ2m,D4v-4mm和六方晶系D3h-6ˉm2,C6v-6mm点群中相应电光系数的横向或纵向效应可能有实用价值。在考虑旋光性影响后,立方晶系T-23,三方晶系D3-32,四方晶系中S4-4ˉ,六方晶系中C3h-6ˉ等也有可能应用。但是,电光晶体的应用与许多因素相关,对称性只是其中一个基本条件。 相似文献
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通过理论模拟对具有上覆盖层的SiO2脊形条波导结构进行了优化,在此基础上利用微电子工艺制作了SiO2脊形波导Mach-Zehnder型电光调制器,并进行热极化引起的电光和非线性效应的研究.热极化过程大幅增强了样品的电光及非线性效应,二次电光系数由热极化前的1.56×10-22(m/V)2提高到热极化后的8.50×10-22(m/V)2,极化后得到了0.093pm/V的线性电光系数,对热极化的物理机理进行了理论分析.
关键词:
电光调制器
2光波导')" href="#">SiO2光波导
电光效应
热极化 相似文献
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为了降低电光相位编码器功率消耗和解决内部M Z调制器一致性要求高的问题,利用2个偏置M Z调制器构成了用于电光模数转换的2 bits电光相位编码器。理论分析了偏置M Z调制器实现2 bits电光相位编码的方法、特点和性能。仿真结果验证了采用偏置M Z调制器构成的2 bits相位编码方法可行性,并实现了对1 GHz模拟电信号的采样速率12 GSa/s模数转换。分析和仿真结果表明,采用该方法对调制器一致性要求低,对输入信号功率要求低于0.32 W。分析结果表明,调制器直流漂移不影响最低位量化结果,引起最高位量化结果的判决模糊低于3.8%。 相似文献
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为了更加深入地掌握光学干涉原理以及晶体材料的电光效应,我们搭建了利用干涉原理的典型光学系统——马赫-曾德尔电光系数干涉测量系统.首先,结合光学干涉原理和晶体材料的二次电光效应,进行了详细的理论推导,证明了测量方法的正确性和可行性.之后,以钽铌酸钾钠(KNTN)晶体作为研究对象,在实验中测量得到了其二次电光系数s11为2.28×10-15 m2·V-2.在此过程中,通过对马赫-曾德尔光学干涉测量系统的理论剖析与实际应用,相信可以帮助同学们更深入地理解和掌握光学干涉、晶体折射率及其电光效应的本质与原理. 相似文献
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本工作系统地测量和分析了Li_O-(LiCl)_2-B_2O_3-Al_2O_3系玻璃的红外光谱,据此研究了玻璃中硼的配位数和硼酸盐结构基团随组成的变化以及Al~(3+)和Cl~-离子在结构中所起的作用,并对光谱中某些吸收峰机理作了定性探讨。 相似文献
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The gamma-irradiated samples of vacuumed powder and single crystal of C2H2O4.2H2O have been investigated by ESR method. the spectra of these single crystal and unvacuumed powder are attributed to R C HOH radical, but the peaks belonging to this radical in the gamma irradiated powder sample are not observed in the spectrum after having been vacuumed. After a and g tensor values of this radical have been calculated, it was observed to be anisotropic. At low temperature, a considerable change in the spectrum has not been observed. 相似文献
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本文应用半导体物理化学方法(借助某些物理测试手段)研究GaAs材料中最主要深施主能级EL2映陷的形成及其转化的一些规律。首先归纳了鉴别EL2本性的三个重要依据(化学计量比、与位错关系和低温光猝灭行为),然后着重阐述三元络合物A_(SGa)V_(As)V_(Ga)作为EL2缺陷构型的形成反应、应变模型形成机理和亚稳态机理,并利用该模型来解释EL2的主要物理和化学性质,对文献报道的EL2其它可能构型如As_(Ga)、As_(Ga)Asi、As_(Ga)V_(As)、As_(Ga)V_(Ga)、(Asi)_4、(As_(Ga))_n、V_(Ga)V_(As)和As_(Ga)V_(Ga)V_(As)等作了评述。最后还讨论了EL2与GaAs中其它深能级的关系,其中包括EL2族现象。 相似文献
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采用Tang Toennies势模型 ,用密耦法求解散射方程 ,计算了入射能量E =0 .0 5eV时 ,0 0- 0 0 ,0 0 - 0 2转动激发截面 ,进而计算了He -H2 ,He -D2 和He -T2 碰撞的角分布。 相似文献
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The growing mode of SnO overlayers deposited on SiO2 has been studied by ISS and XPS. This study has shown that SnO spreads on the surface of SiO2. The oxidation state of tin under different experimental conditions of preparation has been characterized by XPS and ELS and a procedure has been found to produce pure SnO. For comparison, SnO has been evaporated on highly oriented pyrolytic graphite (HOPG). In this case, independent of the deposited amount of SnO, XPS and ELS did not show any significant difference in the photoemission and loss features of this material as a function of coverage (i.e. there are no size effects). On the contrary, at low coverages of SnO deposited on SiO2 XPS showed a shift of 1 eV in the BE of the Sn 3d5/2 peak another of 1.7 eV in the values of the Auger parameter with respect to the values found for the bulk material. These shifts, very common on deposited metal particles, have been previously reported by us for TiO2/SiO2, and are tentatively attributed to t of the interaction of small deposits of SnO with the surface of SiO2. The characterization by ELS and valence band photoemission of SnO completes the set of results reported in this paper. 相似文献
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YAN Yu-Liang SUN Xiao-Jun ZHANG Yue ZHANG Jing-Shang 《理论物理通讯》2007,47(1):102-106
A new light nuclear reaction model has been developed and the double-differential measurements of lp shell nuclei have been analyzed successfully. Now, the application of this model is expanded to 19F of the 2s-ld shell nucleus. The double-differential cross section of total outgoing neutron for n +^19F reactions at En=14.2 MeV has been calculated and analyzed, which agrees fairly well with the experimental measurements. In this paper, the contributions from different reaction channels to the double-differential cross sections have been analyzed in detail. The calculations indicate that this light nudear reaction model is also able to be used for the 2s-ld shell nucleus so long as the related level scheme couM be provided sufficiently. 相似文献
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报道了两个「V2M6S6O」(M=Cu,Ag)八核簇合物的合成和分子结构,讨论了它们的约外光谱,^51VNMR和电子光谱,采用动态红外光谱跟踪技术探讨「V2Cu6S6O2」簇合物的成簇机理。 相似文献
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A new method to apply spatial two-dimensional power spectral density (2D PSD) analysis to the data measured with Particle Image Velocimetry (PIV) has been introduced. Applying the method to a set of the velocity vector fields characteristic turbulence length scales can be estimated. In this method the computation of 2D PSD has been performed to two kinds of pre-processed data. In the first set, the local average has been spatially subtracted (Spatial decomposition) and in the second set the time-average has been subtracted (Reynolds decomposition). In the computation of 2D PSD the 2D FFT with the variance scaling has been used. Besides 2D spectral analysis this paper uses the distribution analysis of the various turbulence quantities and a structure analysis method to estimate the dimensions of coherent structures in the flow. Another method to analyse turbulence length scales is the estimation of the spatial 2D Auto Correlation Coefficient Function (2D ACCF). All these methods applied side by side to the PIV data increase the understanding of the turbulence, its scales and the nature of the coherent structures. 相似文献