Artigos Técnicos e Apresentações

Here you will find presentations given at COMSOL Conferences around the globe. The presentations explore the innovative research and products designed by your peers using COMSOL Multiphysics. Research topics span a wide array of industries and application areas, including the electrical, mechanical, fluid, and chemical disciplines. Use the Quick Search to find presentations pertaining to your application area.

Surface Plasmon Resonance Sensors: Optimization of Diffraction Grating and Prism Couplers

W. Raja[1], A. Alabastri[1], S. Tuccio[1], R. Proietti Zaccaria[1]
[1]Department of Nanostructures, Istituto Italiano di Tecnologia, Genova, Italy

Surface plasmon resonance (SPR) sensors proved themselves as a promising device for many kinds of applications such as optical biosensing, binding constant determinationor nanofilm thickness measurements. Here we simulate using COMSOL Multiphysics® the light-polaritons coupling for the two most commonly used SPR setups: Attenuated total reflection (Kretschmann configuration) and diffraction ...

Modeling of the Quantum Well and Cascade Semiconductor Lasers using 8-Band Schrödinger and Poisson Equation System

M. V. Kisin
Electrical Engineering, State University of New York, Stony Brook, NY, USA

An eight-band quantum mechanical model of the electron and hole energy spectrum, in nanoscale semiconductor heterostructures with phenomenological boundary conditions for the charge carrier multicomponent effective wave function at the heterostructure interfaces, has been formulated using symmetry.COMSOL programs based on this model were developed and used for design and simulation of ...

Prediction and Optimization of Surface-Enhanced Raman Scattering Geometries using COMSOL Multiphysics

I. Knorr, K. Christou, J. Meinertz, A. Selle, J. Ihlemann, and G. Marowsky
Laser-Laboratorium Göttingen e.V., Germany

Raman spectroscopy is a commonly used tool in biodiagnostics and sensor technology. Surface-enhanced Raman scattering provides high signal enhancements especially at nanostructured metallic surfaces. In this paper the electromagnetic Raman enhancement from different metallic nanostructures - including gold coated gratings, spherical and hemispherical particles - is calculated by using the finite ...

Using COMSOL to Solve for Currents along a Thin-Wire Antenna Excited by a Lumped Source

A. Shoory, A. Smorgonskiy, and F. Vega
Electromagnetic Compatibility (EMC) group, Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland

In this paper, we will present simulation results obtained using COMSOL RF module for the current along a wire antenna in both frequency and time domains. The structure is excited through a lumped (voltage or current) source at its center. For the frequency domain simulations we compare the results with the Numerical Electromagnetics Code (NEC-4) and for the time domain results we compare them ...

Transient RF Heating of a Conductive Implant: Coupled Electromagnetic/Thermal Simulation and Experimental Validation

A. Leewood[1], D. Gross[1], J. Crompton[2], S. Yushanov[2], O. Simonetti[3], Y. Ding[3]
[1] MED Institute Inc., West Lafayette, IN, USA
[2] AltaSim Technologies, Columbus, OH, USA
[3] Ohio State University, Columbus, OH, USA

The purpose of this work was to establish a reliable radio frequency (RF) heating simulation which directly provides transient temperatures for medical devices with high geometric fidelity. These temporal results of localized temperatures can be used to determine conditions for safety of medical devices in the magnetic resonance (MR) environment. Information from this work will directly benefit ...

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 ...

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 ...

Tunable MEMS Capacitor for RF Applications

H. S. Shriram[1], T. Nimje[1], D. Vakharia[1]
[1]BITS Pilani, Rajasthan, India

Radio Frequency MEMS devices have emerged to overcome the problem of high losses associated with semiconductors at high frequencies. A tunable MEMS capacitor is a micrometre-scale electronic device whose capacitance is controlled through different actuation mechanisms which govern the moving parts. It can have electrostatic or electrothermal actuators depending on the functional complexity and ...

FEM Characterization of Terahertz Wave on Metal Wire Waveguides

Deibel, J.A., Wang, K., Escarra, M.D., Mittleman, D.M.
Department of Electrical and Computer Engineering, Rice University, Houston, TX, USA

The terahertz (THz) region of the electromagnetic spectrum (100 GHz to 10 THz) remained relatively unexplored until developments in ultrafast laser technology provided techniques for the generation and detection of THz radiation. Recently, simple metal wires were found to be effective terahertz waveguides that exhibited very low loss and dispersion. The THz radiation propagates along the surface ...

Finite-element Analysis of Properties in Real and Idealized Photonic Crystal Fibres, Application to Supercontinuum Generation

Gérôme, F., Viale, P., Tombelaine, V., Leproux, P., Auguste, J.L., Février, S., Blondy, J.M., Couderc, V.
IRCOM, CNRS UMR 6615, Limoges, France

Using a full-vector finite-element method, we calculate modal properties in index-guiding photonic crystal fibres. The influence of the deformation of the geometry in actual fibre structures is evaluated and compared to the idealized-model. These results are applied to the supercontinuum generation. Moreover, development of MATLAB softwares for FEMLAB 3.1 are presented.

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