Aqui você encontrará apresentações realizadas nas Conferências de Usuários COMSOL de todo o mundo. As apresentações englobam pesquisas e produtos inovadores feitas por engenheiros e cientistas usando o COMSOL Multiphysics. Os tópicos abrangem uma grande gama de indústrias e aplicações, como elétrica, mecânica, escoamento e química. Use a função de busca "Quick Search" para encontrar apresentações na sua área de interesse.

A Reliable Approach to Estimate Surface-enhanced Raman Scattering Intensity of Metal Nanostructures

En-Ming You [1], Jun Yi [1], Song-Yuan Ding [1,2],
[1] State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, China
[2] Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen, China

Surface-enhanced Raman scattering (SERS) is a fingerprint spectroscopy whose sensitivity is down to single molecule level. The mechanism of SERS is mainly contributed to huge enhancement of local electric field, which originated from surface plasmon resonance of metal nanostructures. It is very important to exactly calculate the local enhancement in the electric field strength for right ...

Coupled RF Thermal Analysis of High Power Couplers for Accelerator Cavities

R. Kumar[1], P. Singh[1]
[1]Bhabha Atomic Research Center, Trombay, Mumbai, India

High-power couplers working at 350 MHz for particle accelerator cavities are presently under development in the LEHIPA project at BARC. It is important to analyze RF losses on conducting surfaces and resulting thermal profiles. COMSOL Multiphysics® is used to study these coupled RF-thermal effects and estimate cooling requirements for these couplers. The RF loss on the copper conductors and ...

Study of Circular Waveguide Window for Millimeter Wave Transmission Line

K. D. Donda [1], R. Kumar [2], H. B. Pandya [2],
[1] Gujarat Technological University , Gandhinagar, India
[2] ITER-India (Institute for Plasma Research), Gandhinagar,India

Vacuum window is required in the millimeter wave transmission line in ITER*. It is to be designed to minimize the microwave reflection while keeping a robust and safe approach to meet the requirements. We have studied transmission characteristics of various dielectric materials over D-band frequency range (110-170 GHz) using RF Module of COMSOL Multiphysics®. Purpose of this study is to choose ...

空芯光子晶体光纤(HC-PCFs)

刘小璐 [1], 汪滢莹 [1], 田翠萍 [1],
[1] 北京工业大学, 北京,中国

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。新设计的纤芯结构未来可用于大容量光通信、光孤子传输以及色散补偿等应用中。

Analysis of Super Imaging Properties of Spherical Geodesic Waveguide Using COMSOL Multiphysics

D. Grabovi?ki?[1], J.C. González[1], P. Benítez[1], J.C. Miñano[1]
[1]Cedint Universidad Politécnica de Madrid, Madrid, Spain

Negative Refractive Lens (NRL) has shown that an optical system can produce images with details below the classic Abbe diffraction limit. This optical system transmits the electromagnetic fields, emitted by an object plane, towards an image plane producing the same field distribution in both planes. Recently, two devices with positive refraction, the Maxwell Fish Eye lens (MFE) (Leonhardt et al. ...

Numerical Analysis and Optimization of a Multi-Mode Interference Based Polarization Beam Splitter

Y. D'Mello [1], E. Elfiky [1], J. Skoric [1], D. Patel [1], D. Plant [1]
[1] McGill University, Montréal, QC, Canada

The progression toward smaller and faster photonic circuits has led to the development of nanophotonic platforms capable of compacting many devices onto an integrated chip. These devices, as well as the input and output grating couplers, are sometimes polarization dependent, which allows for a preferential treatment of different polarizations within the same circuit, especially since the ...

Multiphysics Analysis of RF Cavities for Particle Accelerators: Perspective and Overview

M. Awida [1],
[1] Fermi National Particle Accelerator Laboratory, Warrenville, IL, USA

Particle accelerator technology evolves gradually towards improving reliability and efficiency of the accelerator machines, which would reduce their cost for current applications and even make them more accessible to new industrial applications. RF cavities are utilized in particle accelerator machines to propel the particle beam by properly coupling the energy from RF sources to the particle ...

Self-Consistent Modeling of Thin Conducting Wires and Their Interaction with the Surrounding Electromagnetic Field

G. Eriksson[1]
[1]ABB AB, Corporate Research, Västerås, Sweden

It is demonstrated how the RF Module of COMSOL Multiphysics® can be used to approximately model thin conducting wires or cables and how they interact with a surrounding electromagnetic field. Despite being non-stringent the method can reasonably well predict currents induced by an applied electromagnetic field in wires, and networks of wires, as well as fields radiated from current-carrying ...

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 ...

Modeling Plasmonic Structure Integrated Single-Photon Detectors to Maximize Polarization Contrast

M. Csete [1], A. Szenes [1], G. Szekeres [1], B. Banhelyi [2], T. Csendes [2], G. Szabo [1],
[1] Department of Optics and Quantum Electronics, University of Szeged, Szeged, Hungary
[2] Institute of Informatics, University of Szeged, Szeged, Hungary

Introduction: Single-photon detectors capable of ensuring high fidelity read-out of quantum information delivered via photons of specific polarization are crucial in QIP [1]. Our previous studies have shown that different types of one dimensional plasmonic structures enhance the absorptance of p-polarized light [2, 3]. The purpose of present study was to optimize four different types of ...