Technical Papers and Presentations

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.

Plasmonic Properties of Bimetal Nanoshell Cylinders and Spheres

K. Ehrhold[1], S. Christiansen[1,2], and U. Gösele[1]
[1]Max Planck Institute of Microstructure Physics, Halle, Germany,
[2]Institute of Photonic Technology, Jena, Germany

Plasmonics is a new branch of the fascinating field of photonics and develops concepts to quench light beyond the diffraction limit and enhance electromagnetic fields. These enhancements occur in metals as localized surface plasmon polaritons (LSP) a coupling of the surface density oscillations of the electron gas to the incident light. With threedimensional nano-structures of coinage metals that ...

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 ...

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.

Design of a Stealth Antenna Using COMSOL Multiphysics

F. De Vita[1], S. Di Marco[1], F. Costa[1], P. Turchi[1]
[1]Altran Italia, Pisa, Italy

This paper will describe some applications of COMSOL Multiphysics to the analysis of Frequency Selective Surface (FSS) structures. Particular attention will be devoted to the possibility of designing a stealthy antenna using the FSS structure. In fact, since it possesses a dual filter concept of frequency and polarization for electromagnetic wave, the Radar Cross Section (RCS) of the antenna is ...

Influence of the Excitation Frequency Increase up to 140 MHz on the VHF-PECVD Technology

S. Leszczynski[1], B. Leszczynska[1], M. Albert[1], J.W. Bartha[1], U. Stephan[2], J. Kuske[2]
[1]Dresden University of Technology, Semiconductor and Microsystems Technology Laboratory, Dresden, Germany
[2]Forschungs- und Applikationslabor Plasmatechnik GmbH, Dresden, Germany

The plasma enhanced chemical vapor deposition process with a linear plasma source and the frequency range up to 140 MHz developed by Dresden University of Technology and FAP GmbH Dresden enables a fabrication of thin film silicon layers at very high deposition rates. However, an increase of the plasma frequency reduces the electromagnetic wavelength. Therefore, the electric field distribution is ...

Thermal Analysis of Metamaterial for High Energy Microwave (HEM) Devices

Vaishali Rawat[1], Sougata Chatterjee[2], Shantanu Das[3], S.N.Kale[1]
[1]Defense Institute of Advanced Technology, Pune, India
[2]Giant Metrewave Radio Telescope,Tata Institute of Fundamental Research,Pune, India
[3]Reactor Control Division, B.A.R.C., & Adjunct Faculty, DIAT, Pune, India

Metamaterial [1, 2] is an artificially structured material where it’s electrical (ϵ), magnetic (μ) and its refraction properties (n) are simultaneously negative in narrow frequency band. Currently, metamaterials are being widely used in microwave and radio frequencies as devices [3, 4] like filter, coupler, antenna etc. However, the applicability of metamaterial as High Energy Microwave (HEM) ...

Calculating the Capacitance of Shielded Microstrip Lines

S. M. Musa, and M. N. O. Sadiku
College of Engineering, Prairie View A&M University, Prairie View, TX, USA

This paper presents a numerical analysis for calculating the capacitance of singlestrip and double-strip shielded transmission lines. Modeling and simulation of the capacitance of shielded microstrip lines using COMSOL are illustrated. We determined the capacitance per unit length of each shielded microstrip line.We compared our results with those obtained by other methods and found them to be in ...

Designing and Simulating THz Guided Wave Devices Using Finite Element Techniques

L. M. Hayden[1], D. A. Sweigart[1]
[1]Department of Physics, University of Maryland Baltimore County, Baltimore, MD, USA

The generation of terahertz frequency radiation (0.1-10 THz) is an important technological goal due to the use of this non-ionizing radiation to penetrate a wide range of non-conducting materials. One outstanding problem has been the propagation of THz radiation in guided wave devices. Few studies on the construction of efficient THz waveguide devices have been performed. We designed and ...

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 ...

Microwave Radiation to Cure Cork Stoppers Using a Conventional Turntable Configuration

D. Fidalgo[1], J. Monteiro[1], L. Costa[1]
[1]I3N and Physics Department, University of Aveiro, Aveiro, Portugal

This work presents an alternative method for curing cork stoppers based on microwave radiation, which is energetically more efficient, where it is possible to accelerate the reaction rate and therefore reduce the cure time comparatively with conventional curing methods. The microwave energy is directly introduced in the volume of the dielectric material and as a consequence, the quality of the ...

Quick Search