Novel multifunctional optical device with only axial material parameter spatially variant

来源 :ChineseOpticsLetters | 被引量 : 0次 | 上传用户:hawkwang2008
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Based on the concept of complementary media and theory of coordinate transformation, a novel kind of optical device, exhibiting the multiple performances of a complementary cloak and a transparent device, is proposed. Only the axial material parameter of the proposed device is spatially variant, and the transverse material parameters are constant. The multiple functions of the proposed device are validated by full wave simulations. In addition, the effects of loss and parameter perturbations on the performances of the device are also investigated. These results can be used in field of antenna protection and other electromagnetic field engineering.
其他文献
本文以粗犷的线条构画了我国激光科学技术发展的历史进程和所取得的某些成就。首先给读者展示一个“缩影”,接着披露了我国第一台红宝石激光器成胎和诞生的前前后后。文中堆砌了六十年代各类激光器竞相发展的状况;七十年代所形成的此起彼伏的激光应用的浪潮;引发出基础研究必须“往高里提”的急切呼声。介绍一个典型实验室。孕育着的光电子工业正得到广泛的关注。
期刊
Image sticking in liquid crystal display (LCD) is related to the residual direct current (DC) voltage (RDCV) on the cell and the dynamic response of the liquid crystal materials. According to the capacitance change of the liquid crystal cell under the DC
采用激光主动照明技术,是对远距离暗目标进行成像、定位和跟踪的重要手段。但由于激光在大气路径中传输,受到大气湍流等因素的影响会造成辐照在目标上的激光光强分布不均匀,同时激光波前会产生畸变,从而降低目标的成像质量,影响对目标的高精度跟踪能力。基于激光照明大气传输模型,对中等湍流、弱湍流和不同光束数情况下的激光照明结果进行了数值模拟,分析了照明激光光强和波前对远距离目标成像的影响。计算结果表明:照明光强起伏方差优于0.5,波前畸变标准误差优于0.2 λ,可满足约1μrad量级的目标分辨能力。
High-energy γ-photon generation via nonlinear Compton scattering and electron–positron pair creation via the Breit–Wheeler process driven by laser–plasma interaction are modeled, and a number of mechanisms are proposed. Owing to the small cross sec
期刊
The relationship between the off-axis angle of the recording setup and the quality of reconstructed particle images in digital off-axis holography is studied. The interference patterns of the same particles in the same plane are recorded at different off-
基于广义非线性薛定谔方程, 通过数值模拟研究了色散平坦渐减光纤中抽运残余成分的抑制.研究结果表明: 超连续谱的形状由输入孤子阶数N、归一化二次色散系数Δ2和归一化有效光纤长度ξ0决定.对于给定N和给定Δ2值的抽运脉冲, 超连续谱的形状依赖于ξ0.通过合适地选取ξ0, 抽运残余成分可以被有效地抑制并获光谱平坦度令人满意的超连续谱.为了获得参量ξ0的最优值, 引入了S因子评价超连续谱的波动.S因子值越小, 所产生的超连续谱越平坦.保持N和Δ2不变, 计算了ξ0取不同值时, 所产生的超连续谱的S因子.当S因子达
本文介绍的Nd:YAG声光锁模激光器,采用声光调制器锁模、部分电光Q开关预激光和储能放大。在谐振腔中插入染料盒还可以进行主被动锁模。整个系统的输出性能是:锁模脉冲宽度从20ps到几个ns秒范围内可调,单个脉冲能量大于0.1mJ,脉冲序列幅度的稳定度优于90%。
期刊
Digital holographic (DH) microscopy is a promising technique for quantitative phase contrast imaging. It provides complex amplitude of the object wavefront, which in turn yields the thickness distribution of the object. An added advantage of the technique
本文介绍了N_2~ 激光器的实验结果。在He-N_2混合系统中,总气压为2大气压时,测得最佳N_2分压力2.4托,并讨论和分析了N_2~ 的形成和猝灭动力学。同时,以2米光栅光谱仪的二级光谱测量了427nm的激光光谱,观察到427nm由双线组成。
期刊
On the basis of a home-made femtosecond Yb-doped fiber laser, we designed a compact and efficient third harmonic generation scheme by a simple compensation plate of β-BaB2O4 crystal. The compensation plate is optimized through its th