排序方式: 共有46条查询结果,搜索用时 15 毫秒
41.
Jiu-sheng Li 《Optik》2008,119(1):19-22
A novel optical modulator using SiO2 waveguides on a silicon substrate is proposed. The modulator is analyzed and designed with the finite element method. The numerical results have shown that an optimally designed modulator can give a broad bandwidth, good impedance match, and low cost. The proposed modulator can be fabricated easily using Si-based very large-scale integrated technology, and it is very suitable for opto-electronic integrated circuits. 相似文献
42.
利用莫尔条纹测量物体三维形貌新方法研究 总被引:8,自引:7,他引:1
提出了以计算机控制光栅产生莫尔条纹来测量物体三维形貌的新方法.利用计算机控制空间光调制器(Space Light Modulator,SLM)产生可控制幅度及位相的理想光栅,将平行光波投影到待测物体上,其反射光通过参考光栅形成莫尔条纹,利用CCD接收并进行数字图像处理,恢复出待测物体的三维形貌.对此方法进行了理论分析,推导了变形莫尔条纹与待测物形貌变化的关系式.利用MATLAB对此关系式进行仿真计算,其准确度可达0.011 μm. 相似文献
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44.
Dr. Xijiao Mu Yajun Liu Dr. Guo-Bin Xiao Chen Xu Xingbang Gao Prof. Jing Cao 《Angewandte Chemie (International ed. in English)》2023,62(39):e202307152
Modulating the surface charge transport behavior of hole transport materials (HTMs) would be as an potential approach to improve their hole mobility, while yet realized for fabricating efficient photovoltaic devices. Here, an oxygen bridged dimer-based monoamine FeIII porphyrin supramolecule is prepared and doped in HTM film. Theoretical analyses reveal that the polaron distributed on dimer can be coupled with the parallel arranged polarons on adjacent dimers. This polaron coupling at the interface of supramolecule and HTM can resonates with hole flux to increase hole transport efficiency. Mobility tests reveal that the hole mobility of doped HTM film is improved by 8-fold. Doped perovskite device exhibits an increased efficiency from 19.8 % to 23.2 %, and greatly improved stability. This work provides a new strategy to improve the mobility of HTMs by surface carrier modulation, therefore fabricating efficient photovoltaic devices. 相似文献
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研究在复杂偏振条件下,飞秒激光诱导非晶合金Zr44Ti11 Cu10Ni10Be25(at%)表面周期性结构的形成机理.实验采用波长800 nm、脉宽120 fs的超短脉冲激光,分别在线性、径向、环向偏振条件下,诱导非晶合金表面生成复杂的周期性表面结构.表面结构由周期为652~723 nm的低频条纹和周期为1 304~1 765 nm的微型条纹组成.通过有限差分时域法仿真分析,发现微型条纹由粗糙表面引起的定向调制的表面散射电磁波与入射激光干涉形成.仿真结果与实验结果一致,验证了微型条纹形成机理的有效性. 相似文献
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多腔回旋速调管中的调制腔采用内外腔同轴结构,对回旋电子注角向群聚起着关键作用。用场匹配理论及HFSS软件对调制腔冷腔特性进行了研究,对多种输入结构、耦合缝尺寸和方位、腔体长度、半径进行了模拟。分析表明,耦合狭缝中心线与输入波导轴线成45°,耦合缝长度达到0.72时,内外腔储能比值达到41.65;耦合缝尺寸对腔体Q值影响较大,但并非呈简单线性关系,并且Q值对缝长的变化比缝宽的变化要敏感得多;而狭缝尺寸变化对谐振频率的影响不大;计算了内外腔储能,得到了模式转换效率高、内外腔储能比高、性能优良的调制腔。 相似文献