Artigos Técnicos e Apresentações

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 abramgem 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.

Enhancement of Terahertz Emission by AuGe Nanopatterns

H. Surdi[1], A. Singh[1], S. S. Prabhu [1]
[1]Tata Institute of Fundamental Research, Homi Bhabha 
Road, Mumbai,India

Since the advent of Terhertz(THz) technology, improving the THz emission power has been one of the major research goal. One of the methods to increase the THz emission power is to increase the coupling of excitation laser light to the dielectric substrate.The field of nano-plasmonics exploits light-matter interactions at nanometer scale. With the help of metallic nano-structure at ...

In Situ electric field simulation in Metal/Insulator/Metal (MIM) capacitors.

Gaillard, N., Pinzelli, L., Gros-Jean, M., Bsiesy, A.

In recent years, a large variety of high dielectric constant materials has been studied as an alternative to silicon dioxide in order to improve the electrical properties in many integrated devices. The authors pointed out MIM electrical properties modifications such as current-voltage shift and the decrease in the voltage gap between the different conduction mechanisms voltage threshold while ...

Characterization of a 3D Photonic Crystal Structure Using Port and S-Parameter Analysis

M. Dong[1], M. Tomes[1], M. Eichenfield[2], M. Jarrahi[1], T. Carmon[1]
[1]University of Michigan, Ann Arbor, MI, USA
[2]Sandia National Laboratories, Albuquerque, NM, USA

We present a 3D port sweep method in a lossy silicon photonic crystal resonator to demonstrate the capabilities of COMSOL Multiphysics® for frequency domain analysis with input and output ports. This method benefits from the advantages of the S-parameter analysis to characterize the input and output coupling into the resonator. By pumping one end of the cavity with a CW plane wave, we are able ...

A Computational Approach for Simulating p-Type Silicon Piezoresistor Using Four Point Bending Setup

T.H. Tan[1], S.J.N. Mitchell[1], D.W. McNeill[1], H. Wadsworth[2], S. Strahan[2]
[1]Queen's University Belfast, Belfast, United Kingdom
[2]Schrader Electronics Ltd, Antrim, United Kingdom

The piezoresistance effect is defined as change in resistance due to applied stress. Silicon has a relatively large piezoresistance effect which has been known since 1954. A four point bending setup is proposed and designed to analyze the piezoresistance effect in p-type silicon. This setup is used to apply uniform and uniaxial stress along the crystal direction. The main aim of this work is to ...

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 ...

Enhanced Surface Plasmon Polariton Propagation Induced by Active Dielectrics

M. Mattheakis[1], C. Athanasopoulos[1], G. P. Tsironis[1]
[1]University of Crete, Heraklion, Greece

We present numerical simulations for the propagation of surface plasmon polaritons in a dielectric-metal-dielectric waveguide using COMSOL Multiphysics® software. We show that the use of an active dielectric with gain that compensates metal absorption losses enhances substantially plasmon propagation. Furthermore, the introduction of the active material induces, for a specific gain value, a ...

Modeling Microwave Chiral Material Based On Crank Resonators Arrays Using COMSOL Multiphysics

J. Muñoz[1], G.J. Molina [1], M.M. Rojo[1]
[1]Dpto. Electromanetismo y Electrónica, Facultad de Química, Universidad de Murcia, Campus Espinardo, Murcia, Spain

Electromagnetic metamaterials present exotic and unusual properties hardly to be found in nature with many potential applications. They are usually built by distributing small resonant structures in periodical lattices. If the structure has chiral symmetry, the medium is called chiral metamaterial. Here the electrodynamics behavior of a chiral structure with a huge electromagnetic activity at ...

Numerical Study of Local Density of States in Photonic Crystal Waveguides

A. Javadi[1], P. Lodahl[1]
[1]Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark

In this contribution we study how a planar photonic crystal waveguide (PhCW), created by introducing a line defect in the photonic crystal, can modify the projected local density of states (LDOS) for a dipole emitter. We use the COMSOL Multiphysics® RF Module to carry out eigenvalue calculations studies on PhCW. When the dipole is in resonance with the waveguide mode, the enhancement Fp of ...

Demonstration of All-Optical NAND Logic Gate Using Photonic Integrated Circuits

J. T. Andrews[1], R. Choubey[1], O P Choudhary[1], N. Malviya[1], A. Patel[1], M. Kumar[1], S. Chouksey[1], J. Solanki[1]
[1]National MEMS Design Center, Department of Applied Physics, Shri G S Institute of Technology & Science, Indore 452003 MP, India

A logic gate performs a certain Boolean logic operation on one or more logical inputs and produces a single logical output. The logic values are either “true” or “false.” Logic gates are bistable devices, that is, they may yield one of these two possible stable outputs. The NAND logic is a universal gate; any logic operation can be performed with various combinations of NAND logics. Many ...

Analysis Of Linearly Polarized Modes

I. Avram, and I. Gavril Tarnovan
The Technical University of Cluj Napoca
Cluj, Romania

This paper presents a study on the propagation modes of electromagnetic waves through a step index fiber optics. To analyze the propagation of electromagnetic field, a simulation in Comsol 4.0 has been implemented using two different optical fibers. Obtaining the propagation modes, called linearly polarized modes (LPnm) to get their characterization according to the radial and azimuthal ...

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