共查询到19条相似文献，搜索用时 31 毫秒
1.
2.
三层手征网格结构的特性研究 总被引：1，自引：1，他引：0
首先基于希腊十字型手征结构,提出一种新型的三层手征网格结构,并对该结构的关键几何参数进行了优化选择;随后对新型手征结构的电磁波响应进行了数值模拟,得到结构对于不同频率入射波的透射和反射响应,依据模拟得到的透射反射系数进行反演计算;最后根据反演计算得到的旋光度、椭偏度、介电常数、磁导率和手征参数等结构特性参数分析结构的旋光性和电磁特性。结果表明,这一结构具有比以往类似结构更好的光学特性,为未来这一类型手征结构的应用提供了更加广阔的思路。 相似文献
3.
4.
5.
矩形手征微带天线的辐射特性 总被引：2，自引：0，他引：2
本文首先建立了有覆盖层的矩形手征微带天线的数学模型，应用谱域导抗法得到了不同区域中的说域并矢格林函数，借助矢量法数据分析了手征介质的本构和几何参数，以及矩形贴片的几何形状等参量对微带天线的谐振频率和方向图的影响程序，发现了一些有趣的现象。 相似文献
6.
在偏振光实验中，测量量是偏振光干涉光强分布，而最后要表示的是椭圆偏振光电矢量。研究了偏振光干涉与椭圆偏振光电矢量之间的转换关系，解决了椭圆偏振光电矢量的测量问题。 相似文献
7.
本文在柱坐标系中导出了手征等离子体波导内横向场量与纵向场量之间的关系,给出从向场量的波动方程,利用波导壁上的电场边界条件,建立了手征等离子体介质填充的圆波导传播常数的特征方程,计算得到了几种低次模式的传播常数随归一化波导半径及材料参数的一系列变化曲线,分析得出了若干有意义的结论。 相似文献
8.
本文研究了法拉第手征圆波导中混合模的传输特性，而在这种双各向异性复杂导波结构中，传输模的横向场分量仍可以用纵向场分量来表示，用Ｍｕｅｌｌｅｒ求根法分析了不同阶混合模的色散和衰减特征，以及不同本构参数对混合模传播特性的影响。 相似文献
9.
在偏振光实验中,测量量是偏振光干涉光强分布,而最后要表示的是椭圆偏振光电矢量。研究了偏振 光干涉与椭圆偏振光电矢量之间的转换关系,解决了椭圆偏振光电矢量的测量问题。 相似文献
10.
本文利用递推本征函数法分析了多层手征介质填充圆波导的传播特性.文中给出了不同介质层中电磁场的递推关系,推导了N层手征介质填充圆波导色散特性的一般性计算公式.作为示例,文中还给出了对几种结构传播特性的计算结果. 相似文献
11.
Matthias Schulz Frank Balzer Dorothea Scheunemann Oriol Arteaga Arne Lützen Stefan C. J. Meskers Manuela Schiek 《Advanced functional materials》2019,29(16)
A facile route to soft matter self‐powered bulk heterojunction photodiode detectors sensitive to the circular polarization state of light is shown based on the intrinsic excitonic circular dichroism of the photoactive layer blend. As light detecting materials, enantiopure semiconducting small molecular squaraine derivates of opposite handedness are employed. Via Mueller matrix ellipsometry, the circular dichroism is proven to be of H‐type excitonic nature and not originating from mesoscopic structural ordering. Within the green spectral range, the photodiodes convert circular polarized light into a handedness‐dependent photocurrent with a maximum dissymmetry factor of ±0.1 corresponding to 5% overall efficiency for the polarization discrimination under short circuit conditions. On the basis of transfer matrix optical simulations, it is rationalized that the optical dissymmetry fully translates into a photocurrent dissymmetry for ease of device design. Thereby, the photodiode's ability to efficiently distinguish between left and right circularly polarized light without the use of external optical elements and voltage bias is demonstrated. This allows a straightforward and sustainable future design of flexible, lightweight, and compact integrated platforms for chiroptical imaging and sensing. 相似文献
12.
13.
Jing Cheng Zhang Mu Ku Chen Yao Liang Xiao Hong Muting Wang Yijun Cheng Xiaoyuan Liu Din Ping Tsai Stella W. Pang 《Advanced functional materials》2023,33(49):2306422
The polarization of light is a valuable information channel that has been studied extensively in optical devices. There has been limited progress in developing low-refractive index contrast and large-scale chiral meta-devices that are easy to integrate and mass-produce. In this image, a chiral imaging meta-device with a large area and broadband chirality control is experimentally demonstrated. The centimeter-scale Moiré meta-device is achieved using nanoimprint technology. The Poynting vector and singularity features in the near field and chiral optical response in the far field are discussed. The proposed Moiré meta-devices can achieve circular dichroism (CD) of more than 10%. Further chiral imaging harnessing CD mechanisms are demonstrated, which may lead to significant potential in various fields, including encryption and security, materials science, biochemistry, and medicine. 相似文献
14.
Han Gao Pei-Gang Chen Tsz Wing Lo Wei Jin Dangyuan Lei 《Advanced functional materials》2021,31(30):2101502
The development of chiral photoluminescence (PL) has drawn extensive attention owing to its potential applications in optical data storage, biosensing, and displays. Due to the lack of effective synthesis methods, colloidal metal nanostructures with intrinsic chiral PL have rarely been reported. Herein, the chiral excitation and emission properties of single gold nanohelicoids (GNHs) are reported for the first time. By measuring their circular dichroism (CD) response and excitation/emission polarization-resolved PL spectra, it is revealed that the intrinsic chirality arising from the geometric handedness of the GNHs induces the observed excitation-polarization-correlated chiral PL. Two models are developed to analyze the observed circular-polarization-steered effect: (1) a chiral PL phenomenological model quantitatively reproduces the PL dissymmetry features; (2) a chiral Purcell effect model reveals that the super-chiral near fields in the GNHs account for the far-field chiral responses such as the polarization-steered chiral PL. The findings not only provide an important understanding of the physical mechanism responsible for luminescent chiral plasmonic nanostructures, but also expand the research on chiral PL-active materials from achiral/chiral hybrid systems to metallic nanostructures with intrinsic structural chirality, thereby broadening the scope of applications in 3D chiral imaging and sensing as well as microstructure analysis. 相似文献
15.
Polarization detection plays an essential role in a wide range of fields, including target identification, 3D reconstruction, and robotic vision. Self-driven on-chip full-Stokes photodetectors are urgently required to meet the trend of miniaturization and integration. Nevertheless, how to fulfill efficient circular and linear polarimetry simultaneously with sufficient recognition effectiveness in a compact device is a great challenge. Herein, a patterned chiral perovskite film is fabricated by imprinting strategy, and vertically-structured self-driven Stokes photodetector is demonstrated, which can recognize various polarization states at 0 V. Through patterned design of the chiral perovskite film by integrating circle and nanowire structure, flexible tuning of circular and linear polarization components within the detector is achieved, enabling the detector to strike a balance between circular and linear polarization detection ability when recognizing arbitrary polarization light. The maximum circular polarization sensitivity factor and linear polarization ratio can reach 0.125 and 1.5, respectively. By optimizing well-defined patterned shape, the resultant detector can recognize polarized light with an average recognition error <7%. This work opens an avenue toward the fabrication of self-driven filterless Stokes detectors based on patterned chiral perovskite film for accurate detection of arbitrary polarization states. 相似文献
16.
偏振态退化对双马赫-曾德尔分布式光纤传感系统定位性能的影响分析 总被引：2，自引：0，他引：2
基于线偏光进入长程传感光路后退偏为椭圆偏振光的基本事实,利用椭圆偏振光干涉法得出了退偏情况下干涉信号的一般公式。通过实际干涉信号与理想干涉信号的对比分析,发现由于退偏作用的存在,输出信号可见度减小为V0(V0=(α21 b21)~(1/2)≤1);辅以琼斯矩阵法,鉴于顺、逆时针光路退偏作用的非对称性,探测器D1、D2探测到的干涉信号相位误差ζ1≠ζ2,从而将误差引入信号时延Δτ,严重影响传感系统定位精度。进一步揭示出对系统进行偏振态衰落抑制方法研究的重要意义。 相似文献
17.
18.
Seongyeon Yang Gyumin Jang Chan Uk Lee Jaehyun Son Junwoo Lee Wooyong Jeong Dong Gue Roe Jeong Ho Cho Jooho Moon 《Advanced functional materials》2024,34(19):2310917
Chiral perovskites have emerged as promising next-generation materials for polarization detection due to their excellent circularly polarized light (CPL) detection capabilities. However, they suffer from a low chiroptical response when fabricated as a polycrystalline thin film, limiting their potential range of applications. Herein, it is demonstrated that antisolvent dripping during the spin-coating process can effectively improve the chiroptical properties of polycrystalline chiral perovskite thin films. Systematic analysis with different antisolvents reveals that the highly polar antisolvent chloroform interacts with dimethyl sulfoxide molecules via hydrogen bonding. This strong hydrogen bonding suppresses the formation of intermediate and secondary phases and accelerates the crystallization of chiral 1D perovskites, thus reducing the density of the iodine vacancies inside the perovskite thin films. The lower density of iodine vacancies also intensifies the asymmetric tilting inorganic distortion of PbI6 octahedrons, enhancing the chiroptical response of the fabricated chiral perovskite material. Photodetectors based on the chloroform-treated chiral perovskite films achieve a remarkably high distinguishability of 0.31, outperforming previously reported photodetectors based on the chiral perovskites. The fabricated photodetectors also exhibit outstanding responsivity and detectivity with enhanced operational stability. 相似文献