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.

3D Modeling of Planar Discharge of a CO2 Laser

J. Schüttler [1],
[1] Rofin-Sinar Laser GmbH, Hamburg, Germany

High power CO2 lasers have been the workhorses for sheet metal cutting, welding and many more applications in materials processing during the past decades. Even though a significant replacement by fiber coupled lasers takes place, there are still many applications that benefit from the characteristics of CO2 lasers with a high beam quality. Modeling the plasma behavior is essential for ...

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 ...

Commercial Special Fibers for Sensing Applications

G. Latha[1], P. Nair[1]
[1]SSN College of Engineering, Chennai, Tamil Nadu, India

In a solid core PCF, structural parameters and the number of rings in the cladding region decide confinement losses, dispersion coefficients as well as bending losses. 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 ...

Key-Holes Magnetron Design and Multiphysics Simulation

A. Leggieri[1], F. Di Paolo[1], D. Passi[1]
[1]Univeristy of Rome "Tor Vergata" - Department of Electronic Engineering, Rome, Italy

This paper describes the design and characterization of an 8 slots resonant cavity Magnetron, which undergoes thermal-structural effects due to cathode heating. The proposed study involves Thermal Stress, Eigen-frequency and Particle Tracing analysis based on COMSOL Multiphysics®. Magnetrons are well known and often utilized High Power Radiofrequency Vacuum Tube oscillators. In order to ...

Plasmonic Waveguide Analysis

K. C. Koppenhoefer [1], S. Yushanov [1], J. S. Crompton [1],
[1] AltaSim Technologies, Columbus, OH, USA

Surface Plasmons (SP) or Surface Plasmon Polaritons (SPP) are electromagnetic excitations that propagate at the interface between a dielectric and a conductor, and are evanescently confined in the perpendicular direction to the propagation. They arise via coupling of the electromagnetic field to oscillations of the conductor’s electron plasma and are characterized in terms of dispersion and ...

Dispersion Analysis in Coaxial Cables at High Frequencies

S. C. Hegde[1]
[1]VIT University, Vellore, Tamil Nadu, India

The coaxial cable is one of the most commonly used bandwidth limited signal transmission line.Dispersion is a signal distortion phenomenon which arises due to frequency dependence of phase velocity of signal components. This phenomenon was explained through time domain approach by studying time taken by signals of various frequencies to propagate through the cable, which eventually may cause ...

Modeling Electrical and Thermal Conductivities of Biological Tissue in Radiofrequency Ablation

M. Trujillo[1], E. Berjano[1]
[1]Universidad Politécnica de Valencia, Valencia, Spain

Radiofrequency ablation is a minimally invasive techinique which is used to treat some kinds of cancer. The realism of theoretical models is very important. An influential factor in this realism is mathematical functions that model the temperature-dependence of tissue thermal and electrical conductivities. The aim of this work is to review the mathematical functions employed to model the ...

Antenna and Plasmonic Properties of Scanning Probe Tips at Optical and Terahertz Regimes - new

A. Haidary[1], P. Grütter[1], Y. Miyahara[1]
[1]Physics Department, McGill University, Montreal, QC, Canada

A wide variety of near-field optical phenomena such as apertureless near-field scanning microscopy (ANSM) at optical and terahertz (THz) regimes and surface enhanced Raman scattering relies on the electric field enhancement at the end of a sharp tip. Achieving and controlling this electric field enhancement is a key challenge for a wide range of applications such as surface modification, data ...

Simulations of Negative Curvature Hollow-core Fiber - new

J. Zhang[1], Z. Wang[1], J. Chen[1]
[1]College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha, Hunan, China

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 ...

Numerical Simulation of the Heat, Mass, and Momentum Transfer During the Microwave Drying of Osmodehydrated Porous Material - new

J. R. Arballo[1, 2], L. A. Campañone[1, 2], R. H. Mascheroni[1, 2]
[1]Universidad Nacional de La Plata (UNLP), La Plata, Buenos Aires, Argentina
[2]Centro de Investigación y Desarrollo en Criotecnología de Alimentos (CIDCA), La Plata, Buenos Aires, Argentina

Recent studies have been devoted to develop mathematical models to simulate the food processing using the porous media approach. The aim of this study is to simulate the microwave drying of osmodehydrated food by means of modeling the mass, energy and momentum transfer using the porous media approach. Microwave drying involves complex physical mechanisms which should be taken into account in the ...