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Right: Stopband at a 700-nm wavelength.
Modeling a Photonic Crystal Fiber
A step-index fiber guides light through the high refractive index of the core, while a photonic crystal fiber (PCF) is made up of microstructured optical fibers that guide light either through index guiding or band gap confinement.
COMSOL 博客 -
cn.comsol.com/blogs ...
此模型体现的是 J. D. Joannopoulus 书中讨论的指数导向光子晶体光纤。基模和高阶模的色散图与第 9 章图 4 非常匹配。孔半径变化范围为 0.23[um] 到 4.69[um]。
J.D. Joannopoulus, R.D. Meade, and J.N. Winn, Photonic Crystals (Modeling the Flow of Light), Princeton University Press, 2008.
该模型文件与此篇博客文章相关：https://cn.comsol.com/blogs/engineering-the-flow-of-light-using-photonic-crystals
案例下载 -
cn.comsol.com/model/75371
The optical fiber communication has been popular topics besides robot study nowadays. It is hard to solve this problem by experimental study on photonic crystals with high negative dispersion structure. The structural parameters are adjusted for the traditional hexagonal photonic crystal fiber and the negative dispersion coefficient is obtained as larger as possible.
论文和技术资料 -
cn.comsol.com/paper/43493
Photonic crystal fiber (PCF) is also known as micro structured or holey fiber that uses Photonic crystal, which is formed using a periodic array of microscopic air holes that run along the entire fiber length. Light propagation in PCFs is far superior to standard fiber, which uses constant lower refractive index cladding.
论文和技术资料 -
cn.comsol.com/paper/83601
It is a complex problem to calculate the photonic crystal fiber model, and the methods of plane wave expansion, Hermite-Guasssian function and beam propagation have been analyzed.
论文和技术资料 -
cn.comsol.com/paper/20011
This paper evaluates some of commercially available solid core photonic crystal fibers. The dispersion coefficients and sensitivity of these fibers are estimated using COMSOL Multiphysics®, and compared with the theoretical values wherever available. SCPCFs cross-section presents a periodic array of air holes surrounding a solid core, which extends invariably along the fiber length. When using a single material in the fiber manufacturing, this cross-sectional configuration leads to a lowering of the cladding’s effective refractive index given that the solid core is made of the same material.
论文和技术资料 -
cn.comsol.com/paper/19371
We present the utilization RF module of COMSOL Multiphysics® for understanding three different types of wave guidance mechanisms in photonic crystal fibers (PCFs), like modified total internal reflection, Bragg’s reflection and resonant trapping of defect mode at Dirac frequency. Effective refractive indices of the core and cladding are calculated using mode analysis study to verify total internal reflection in a solid core PCF. The photonic band structure (PBS) of the cladding is calculated using eigen frequency study to identify photonic band gap (PBG) region and Dirac point.
论文和技术资料 -
cn.comsol.com/paper/27181
There has been a growing interest in optical parametric amplifiers (OPA) for light generation and amplification in because of the possibility for arbitrary operation wavelength and wideband tenability [1]. PCFs are of particular interest in such nonlinear optics applications because of the enhanced light confinement and the resultant high nonlinearity (γ) achievable with air-cladded designs. Additionally, the geometric parameters of PCFs provide multiple degrees of freedom for dispersion engineering.
论文和技术资料 -
cn.comsol.com/paper/28631
COMSOL Multiphysics® software was used to simulate and analyze the transmission attenuation spectra of the negative curvature hollow-core fiber (NCHCF) over the wavelength from 2.7 μm to 4.2 μm. The effect of thickness of capillaries and the effect of the distance between the capillaries on confinement loss spectra were studied, which agreed well with the high-loss and low-loss bands predicted by the ARROW model. Based on mode confinement factor, a criterion for selecting the fundamental mode was proposed.
论文和技术资料 -
cn.comsol.com/paper/19929
在真空室、海底和油气储层等严苛的环境中，传感器发挥着重要的作用。在极端环境中，传统的传感技术可能失效，而光纤传感器具有灵敏度高、抗电磁干扰等特点，能够适应各种环境条件，因此成为一种灵活的压力传感解决方案。巴西的坎皮纳斯大学（Universidade Estadual de Campinas）和空军研究所联合（Instituto de Estudos Avançados）展开研究，研发出了具有高灵敏度的微结构光纤。借助数值仿真，研究团队最大限度地增强了光纤的双折射特性对压力变化的依赖性，进而提升了传感器的灵敏度。
用户案例 -
cn.comsol.com/story/58151
Design and optimization of the nanophotonic devices are critical in realizing advanced photonic integrations in the future. COMSOL can be used for simulating various types of nanophotonic devices involving different materials and dimensions. This report talks about some recent work of Prof. Zheng’s team, including the simulation of dielectric photonic waveguides, optic fibers and surface plasmon polariton (SPP) waveguides and devices.
论文和技术资料 -
cn.comsol.com/paper/9804
Anisotropic materials, such as the crystal from the stone and bench experiment described above, are found in applications ranging from detecting harmful gases to beam splitting for photonic integrated circuits.
There are basically two kinds of anisotropic crystal: uniaxial and biaxial crystal.
COMSOL 博客 -
cn.comsol.com/blogs/how-to ...
We present a study of an optofluidic biosensor. The sensor operates in a transmission mode wherein detection is based on a shift in the transmission spectrum caused by the contrast in refractive index between the carrier fluid and the target biomaterial. We study the behavior of the sensor using 2D full-wave electromagnetic analysis, and perform parametric studies of sensitivity as a function of key device parameters. Device optimization can be accomplished using the COMSOL RF Module, and parametric designs can be completed within a few minutes on a modern workstation.
论文和技术资料 -
cn.comsol.com/paper/6396
Ever since its advent optical fibers have revolutionized the communication technology but apart from communication they are being used in a variety of other areas such as medical technology, sensing, laser sources in the form of fiber lasers, amplifiers, cutting and drilling, defense applications etc. Optical fibers are manufactured by drawing techniques which have largely limited the materials that can be incorporated in them. High pressure chemical vapor deposition (HPCVD) has emerged as an important technique to deposit various materials inside pre-drawn hollow optical fibers.
论文和技术资料 -
cn.comsol.com/paper/26342
Uma fibra óptica retorcida pode se converter em uma estrutura longitudinalmente invariante através de uma transformação de coordenadas. O anterior permite fazer um analise de modos transversais da fibra, servindo para estudar a geração de modos com momento angular orbital (OAM). Atualmente, os modos OAM se encontram em diversas aplicações como na microscopia e nas telecomunicações entre outros.
论文和技术资料 -
cn.comsol.com/paper/18477
A logic gate performs a certain Boolean logic operation on one or more logical inputs and produces a single logical output. The logic values are either “true” or “false.” Logic gates are bistable devices, that is, they may yield one of these two possible stable outputs. The NAND logic is a universal gate; any logic operation can be performed with various combinations of NAND logics.
论文和技术资料 -
cn.comsol.com/paper/15907
Microstructured optical fiber (MOF) has carved out a niche in the field of photonics in the last decade. On the other hand, the field of plasmonics is also rapidly emerging as a fascinating research area. Combining the advantages of both these fields therefore seems imperative for newer applications in interdisciplinary areas, thereby leading to the development of metal-incorporated MOFs.
论文和技术资料 -
cn.comsol.com/paper/61041
空芯光子晶体光纤（HC-PCFs）具有不同于传统光纤的带隙导光机制，在光通信系统、高功率激光器、工业制造和生物医疗等许多领域有广阔的应用前景。随着光纤拉制技术的不断进步，不同纤芯结构的 HC-PCFs 出现并带来了更好的光传输特性（图1）。通过设计新的纤芯形状，并运用 COMSOL Multiphysics® 中的 RF 模块进行仿真，可以研究各种纤芯 HC-PCFs 的模式（图2）、泄漏损耗（图3）和波导色散（图4）等特性。结果表明：设计的内凹圆化形纤芯 HC-PCFs 比传统的正十二边形纤芯 HC-PCFs 有更低的泄漏损耗和波导色散，而设计的内凹直线形纤芯 HC-PCFs 有很低的泄漏损耗和大的波导色散。
论文和技术资料 -
cn.comsol.com/paper/31173
The present work explores the integration of guided mode resonance (GMR) structures and topological photonics, characterized by the presence of Jackiw-Rebbi (J-R) solution. The developed surface enhanced GMR structure may serve as a platform for refractive index sensing across various fluids, with the property of being more fabrication-friendly. GMR structures are engineered optical devices that leverage resonance phenomena to enhance light-matter interactions.
论文和技术资料 -
cn.comsol.com/paper/128321
Note that the output characteristic of this plasmonic waveguide filter is similar to that of the fiber Bragg grating (FBG) configuration.
When a monochromatic beam of light is introduced and passes through such a nonlinear crystal, not only does the output frequency spectrum show the original frequency (ω), but it also indicates the second-order harmonic frequency (2ω).
COMSOL 博客 -
cn.comsol.com/blogs/how-to ...