【摘 要】
：
Intersubband linear and third-order nonlinear optical properties of conical quantum dots with infinite barrier potential are studied. The electronic structure of conical quantum dots through effective mass approximation is determined analytically. Linear,
【出 处】
：
ChineseOpticsLetters
论文部分内容阅读
Intersubband linear and third-order nonlinear optical properties of conical quantum dots with infinite barrier potential are studied. The electronic structure of conical quantum dots through effective mass approximation is determined analytically. Linear, nonlinear, and total absorption coefficients, as well as the refractive indices of GaAs conical dots, are calculated. The effects of the size of the dots and of the incident electromagnetic field are investigated. Results show that the total absorption coefficient and the refractive index of the dots largely depend on the size of the dots and on the intensity and polarization of the incident electromagnetic field.
其他文献
Optical orbital angular momentum (OAM) is a special property of photons and has evoked research onto the light–matter interaction in both classical and quantum regimes. In classical optics, OAM is related to an optical vortex with a helical phase structur
阿符科-埃弗雷特研究实验室的最初实验表明，激光能为清除飞机曲面上的涂漆提供一种高效、低成本的方法。如果这一应用获得成功，它将为激光制造商打开一个很大的市场。现在美国国防部用来清除军用飞机涂漆的费用，每年至少1500万美元。商用民航系统每年花费也有数万美元之多。
与目前广泛应用的532 nm波段的发射波长相比, 采用355 nm波段发射波长进行大气温度观测对分光光谱仪的精度要求更高, 分光光谱仪的线色散率要达到0.1 nm/mm。提出了一种新型高线色散率纯转动拉曼激光雷达分光光谱仪, 通过设计双光栅结构来达到激光雷达纯转动拉曼回波信号分光的目的。利用Zemax软件进行设计, 模拟分析结果显示：间隔0.1 nm的两个相邻光谱在分光光谱仪聚焦镜焦平面处两个相邻谱线中心可以分开1 mm, 满足测温纯转动拉曼分光光谱仪线色散率达到0.1 nm/mm的要求。将实验得到的斯托
研究了MPP CCD扩散暗电流的温度特性，分析了扩散暗电流在不同温度下对器件总暗电流的贡献和不同处理方式对评估器件高温暗电流的影响，并对此进行了实验验证。结果表明，扩散暗电流在高温下对器件总暗电流的影响很大，占据支配地位，是器件高温暗电流的主要来源。提出了两种优化方法，以降低扩散暗电流对器件高温暗电流的影响，提高MPP CCD的高温环境工作能力。
High-power mode-programmable orbital angular momentum (OAM) beams have received substantial attention in recent years. They are widely used in optical communication, nonlinear frequency conversion, and laser processing. To overcome the power limitation of
Microstructured targets demonstrate an enhanced coupling of high-intensity laser pulse to a target and play an important role in laser-induced ion acceleration. Here we demonstrate an approach that enables us to control the morphology of amorphous solid w
针对Itti的视觉注意模型不能很好地反应区域的边界和形状问题,提出了一种改进的自底向上(BottomUp)的视觉注意模型。在经典的Itti模型基础上,用小波变换取代了高斯金字塔分解,改进了初始视觉特征的合并策略以得到图像的视觉显著图,结合彩色图像聚类分析方法完成图像的感兴趣区域自动提取。实验结果表明,自动提取的感兴趣区域更符合人眼的实际观察效果,在复杂背景下的提取效果大大优于传统的感兴趣区域提取方
采用第一性原理赝势平面波方法对应力调制下β-FeSi2的电子结构及光学性质进行了计算，全面分析了应力对β-FeSi2能带结构、电子态密度和光学性质的影响。在各向同性应力的作用下，压缩晶格使β-FeSi2的导带向高能区漂移，带隙变宽，拉伸晶格使导带向低能区漂移，带隙变窄，且当拉伸应力增加到-25 GPa时，费米能级穿过了价带和导带，β-FeSi2由半导体变成了导体；压缩晶格会使各光学参数发生蓝移，增大β-FeSi2的吸收系数和光电导率，降低反射率，而拉伸晶格会导致红移，增大静态介电常数，折射率n0和反射率，
Enhancing light–matter interaction in cavity quantum electrodynamics has aroused widespread interests in on-chip quantum information processing. Here, we propose a hybrid nanotoroid–nanowire system to enhance photon–exciton interaction. A nanoscale gap is