Ici vous trouverez les présentations issues des Conférences COMSOL à travers le monde. Réalisées par des utilisateurs de COMSOL Multiphysics, ces présentations explorent tous les domaines actuels d'innovation. Les applications couvrent pratiquement tous les secteurs industriels et impliquent des phénomènes électriques, mécaniques, fluidiques et chimiques. Utilisez la recherche rapide pour trouver les présentations les plus intéressantes dans votre domaine d'intérêt.

Study of Energy Transfer Mechanism for a Synchrotron X-ray Gas Absorber with COMSOL Multiphysics

A. Martín Ortega [1], Y. Dabin [1], T. Minea [2], A. Lacoste [3]
[1] ESRF, Grenoble, France
[2] LPGP, Université Paris-Sud XI, Orsay, France
[3] LPSC, Université Joseph Fourier, Grenoble, France

The high power of X-ray beam delivered by synchrotrons and free electron lasers, up to 240 W/mm2, requires heat load management solutions to obtain the best performance from the optical elements which will shape the beam for its use in the experimental stations [1]. One solution is the use of gas attenuators: a tube filled with an inert gas, usually Argon or Krypton, is placed between X-ray ...

FE Modeling of Surfaces with Realistic 3D Roughness: Roughness Effects in Optics of Plasmonic Nanoantennas

J. Borneman[1], A. Kildishev[1], K. Chen[1], and V. Drachev[1]

[1]School of Electrical and Computer Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana, USA

COMSOL Multiphysics has been widely used to model the near and far-field electromagnetics (specifically, transmission and reflection spectra) of gold and silver nanoantenna arrays. We use a moving 3D mesh, thus preserving the DOF number and simply morphing the structure of the mesh to accommodate the moving boundary. The electromagnetics model consist of four multiphysics models, two ...

Dual Phononic And Photonic Band Gaps In A Periodic Array Of Pillars Deposited On A Membrane

Y. Pennec, Y. El Hassouani, C. Li, B.D. Rouhani, E.H. El Boudouti, H. Larabi, and A. Akjouj
Institut d’Electronique, de Microélectronique et de Nanotechnologie, Université de Lille, Villeneuve d’Ascq, France

Phononic crystals are a class of materials that exhibit periodic variations in their density and elastic properties. Such crystals modify the propagation of acoustic waves and prohibit the propagation of sound for frequencies within the band gap. We discuss the simultaneous existence of phononic and photonic band gaps in a periodic array of silicon pillars deposited on a homogeneous SiO2 ...

Heating of Metal Nanoparticles on Absorbing Substrates

L. Bergamini [1], O. Muskens [2], N. Zabala [1], J. Aizpurua [3]
[1] UPV/EHU, Bilbao, Spain; Materials Physics Center and CSIC-UPV/EHU, Donostia-San Sebastian, Spain; Donostia International Physics Center, Donostia-San Sebastian, Spain
[2] University of Southampton, Southampton, UK
[3] Materials Physics Center and CSIC-UPV/EHU, Donostia-San Sebastian, Spain; Donostia International Physics Center, Donostia-San Sebastian, Spain

It is well-known that metal nanoparticles (NPs) excited at the plasmon frequency not only exhibit peculiar optical properties (e.g., a peak in the extinction spectrum, an enhanced electromagnetic near-filed) but also heat up [1]. This phenomenon is highly investigated for medical applications, but it can be exploited also for the realization of optical devices. In our study we use COMSOL ...

Metamaterial Based Patch Antenna with Broad Bandwidth Designed by COMSOL Multiphysics® Software

李学识 [1], 郑李娟 [1],
[1] 广东工业大学,广州,中国

A patch antenna based on metamaterials of composite split-ring-resonators (CSRRs) and strip gaps is designed with COMSOL Multiphysics® software. The antenna is constructed by using CSRR structures in forms of circular rings on the patch and employing strip gaps on the ground plane. The signal is fed by a common microstrip line that connects the patch and the input port. The antenna is based on a ...

Forces and Heating in Plasmonic Particles

M. Gonçalves[1], O. Marti[1]
[1]Ulm University - Inst. of Experimental Physics, Ulm, Germany

Plasmonic resonances arising in gold nanoparticles lead to strongly localized near-field enhancements. These enhancements generate strong field gradients that can be exploited in particle trapping. On the other hand plasmonic resonances lead to enhanced absorption and heat generation. Gold nanoparticles have been used to kill cancer cells based on plasmonic heating. We have investigated the ...

Radiation Heat Transfer in Imaging Infrared Spectrometer

A. Jhaveri [1], M. Kushhare [1], A. Bhargav [1],
[1] Indian Institute of Technology Gandhinagar, Gandhinagar, Gujarat, India.

Imaging Infrared Spectrometer (IIRS) is a Hyperspectral optical imaging instrument which measures the spectra of a scene in high resolution within spectral bands covering Near Infrared (NIR) to Mid Infrared (MIR) regions. Radiation entering the spectrometer assembly governs the temperature of different internal parts and hence plays an important role in determining the desired spectral ...

Direct and Indirect Coupling Mechanisms in a Chiral Plasmonic System

Zhongyue Zhang [1], Yuyan Chen [1],
[1] School of Physics and Information Technology, Shaanxi Normal University, Xi’an, China

手性等离激元纳米结构被广泛研究并用于生物监测、分析化学和负折射率介质方面。在该结构中直接耦合的机制已经在相关研究中被发现。我们提出由金膜分隔两个金纳米棒(TNMF)的结构(图1),并发现了间接耦合机制。 在 COMSOL Multiphysics® 中,射频电磁波,频域接口用于求解正弦时变电磁场分布,选此接口计算 TNMF 结构的光学响应。插值函数用来设置金的折射率;设置边界条件模拟周期性结构阵列。结果可通过端口2对端口1的响应获得,并可查看每个数据点的电场、电荷等分布。应用程序库中射频模块的“Plasmonic wire grating”教程是初始指导我们计算纳米结构的例子。 用软件模拟圆偏振光照射,得到透射曲线和圆二色性(CD)曲线(图2)。加入金膜的结构产生新模式2。通过 B-K 模型分析电荷分布(图3),发现模式1是直接耦合,模式2是间接耦合。对间接耦合模式,上 ...

Enhancing Fluorescence of Diamond Color Centers near Gold Nanorods via Geometry Optimization

M. Csete [1], A. Szenes [1], L. Zs. Szabó [1], G. Szabó [1], T. Csendes [2], B. Bánhelyi [2],
[1] Department of Optics and Quantum Electronics, University of Szeged, Szeged, Hungary
[2] Institute of Informatics, University of Szeged, Szeged, Hungary

Detecting light emitted by fluorescent molecules with resolution down to single photon is an important problem in various fields of sciences and applications, such as solid-state physics, quantum information processing and medicine. The detection probability can be improved via enhancement of excitation and emission. Enhancement both of these processes can be reached by localized surface plasmon ...

Electromagnetic Analysis of Cloaking Metamaterial Structures

E. Furlani, and A. Baev
The Institute for Lasers, Photonics and Biophotonics, University at Buffalo, Buffalo, NY, USA

We study cylindrical and spherical shell structures that have cloaking material properties proposed by Pendry et al. We use 2D and 3D time-harmonic analysis to study the field distribution and power flow for various arrangements of these structures. We have shown that the COMSOL RF solver is well suited for the analysis of cloaking metamaterial structures If cloaking material properties can be ...