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.

Analysis of Microwave Radiation for Heating

J. Crompton, S. Yushanov, L. Gritter, and K. Koppenhoefer
AltaSim Technologies, LLC.
Columbus, OH

Microwave heating is an important process for many commercial, industrial and household applications. In microwave heating applications, the energy is introduced directly into the volume of the material. As a consequence the quality of the process is highly dependent on the uniformity of the electromagnetic field distribution. Thus, developing a uniform electromagnetic field inside the ...

Analysis of RF Characteristics of a Compound Semiconductor Device Integrated with a Wide-Band Antenna for THz Wireless Communications

A. Tashiro[1], M. Nakamura[1], M. Suhara[1]
[1]Tokyo Metropolitan University, Hachioji City, Tokyo, Japan

Use of the terahertz(THz) region, which is unexplored frequency band, is investigated and expected for the next-generation high-speed wireless communication. In this presentation, we propose a monolithic integrated device by using mesa-shaped compound semiconductor and a thin-metal broadband antenna which is capable in THz operation, and we analyze several characteristics of the device by using ...

Dielectric Properties Characterization of Thin-film Samples by using Scanning Near-Field Microwave Microscope (SNMM) and FEMLAB

Huang, S.1, Reeves, M.E.1, 2
1 Department of Physics, George Washington University, Washington
2 Naval Research Laboratory, Washington, DC

Scanning Near-field Microwave microscope represents a novel approach to thin film dielectric property analysis with high resolution. In this technique, a sharp probe tip is brought into close enough proximity to the sample surface that the EM field are well described by the near field theory. The question addressed here is how to determine material parameters (in this case dielectric constant) ...

Resonances in Tapered Double-Port TEM Waveguides

J. Kaerst
HAWK, Fachhochschule Hildesheim/Holzminden/Göttingen, Germany

In this paper resonances in tapered double-port TEM waveguides are used as benchmark for simulations. FEM simulations with COMSOL Multiphysics® and simulations using generalised telegraphist's equations with MATLAB® are compared to ananalytical method capable of calculating the resonances of higher order modes. It is valid for tapered double-port TEM waveguides with constant ...

FEM Study of Nano-structured Surface-relief Optical Data Storage

Kalavagunta, A.1, Neifeld, M.A.2
1 Vanderbilt University, Nashville, TN
2 Univerisity of Arizona, Tucson, AZ

We are studying the ability of subresolution optical structures to store data. We begin our study with surface relief structures. Because we are probing features whose sizes are much smaller than the wavelength of the readout light, retrieval of data from these structures requires near-field detection. The dimensions of the glass fill-in and the grooves of the above mentioned structure was ...

Study on Electromagnetic Waves in the Terahertz Region Using COMSOL Multiphysics

T. Nishida[1]
[1]Shinshu University, Matsumoto City, Nagano, Japan

Electromagnetic waves in the terahertz (THz) region may be useful for non-destructive imaging and biosensing technology. This presentation shows the example of our research aimed at the development of application in the THz region. The result of comparing the FDTD method and COMSOL Multiphysics is demonstrated in the investigation of metamaterial and the photoconductive antenna.

Numerical Studies of a Confocal Resonator Pick-up with FEMLAB

Ekelöf, T., Ferrari, A., Johnson, M., Rydberg, A., Ziemann, V., Öjefors, E.
Department of Radiation Sciences, Uppsala, Sweden

Diagnostic devices aimed at measuring beam profiles in high intensity accelerators are often perturbed by microwave Fields generated by the beam itself upstream of the detection device, which propagate inside the vacuum pipe. These parasitic waveguide modes can significantly reduce the signal-to-noise ratio and thus the sensitivity of the beam monitor. This warrants investigation of detection ...

Computational study of Solidification and Melting of Alloys

Shuang-Shii Lian
National Taiwan University

This paper is written in Chinese. --------------------------------- Keynote speaker's biography: Since 1991, Prof. Shuang-Shii Lian has been with the Department of Materials Science and Engineering, National Taiwan University. He earned a PhD degree in Metallurgy at Technische Universität Berlin, Institut für Metallurgie, Germany in 1981. He is using COMSOL Multiphysics since 2002 ...

Complex K-Bands Calculation for Plasmonic Crystal Slabs by Means of Weak Formulation of Helmholtz's Eigenvalue Equation

G. Parisi[1], P. Zilio[1], F. Romanato[1]
[1]University of Padova, Padova, Italy

We present a Finite Element Method (FEM) to calculate the complex valued k(?) dispersion curves of a photonic crystal slab in presence of both dispersive and lossy materials. In particular the method can be exploited to study plasmonic crystal slabs. We adopt Perfectly Matched Layers (PMLs) in order to truncate the open boundaries of the model, including their related anisotropic permittivity and ...

Calculations of the FMR Spectrum in 1D Magnonic Crystals

M. Mruczkiewicz[1], M. Krawczyk[1], V.K. Sakharov[2], Yu. V. Khivintsev[2], Yu. A. Filimonov[2], S. A. Nikitov[3]
[1]Nanomaterials Physics Division, Faculty of Physics, Adam Mickiewicz University, Pozna?, Poland
[2]Kotel’nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences (Saratov Branch), Saratov, Russia; Laboratory “Metamaterials”, Chernyshevsky Saratov State University, Saratov, Russia
[3]Kotel’nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Moscow, Russia; Laboratory “Metamaterials”, Chernyshevsky Saratov State University, Saratov, Russia

FMR spectra of the periodic microstructures (one-dimensional magnonic crystals, 1D MCs) were obtained using COMSOL with use partial differential equation interface. Results of these calculations were successfully compared with an experimental data for Damon-Eshbach (DE) and Backward-Volume (BV) geometries. The presented tool allows to analyze periodic structures with various geometries and ...

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