tutorial model - step index fibre
I am a beginner in comsol. could you please explain how the electric field pattern is being displayed even when we are not giving any input to the fibre.... is it just assuming a field..?
View ArticleInput Port Excitation Power for 2D RF Simulation
Hello, I'm having difficulty understanding exactly what the input power is for the port in the RF module in COMSOL 4.3. The unit is declared as watt, but unless there's some predefined thickness, the...
View ArticlePropagation constant using port excitation
Dear All, I have a question regarding the usage of propagation constant parameter for port excitation in the EM frequency domain simulation. I tried to use the port functionality to excite an EM wave...
View Articlephononic crystal band gap
Hi, I would like to know how to obtain the band gap diagram of a phononic crystal in Comsol. I was trying to use photonic crystal model presented to model one unit cell, but I don't know how to use it...
View ArticleQuadrifilar Helix Antenna
Hi! I'm looking to simulate a Quadrifilar Helix Antenna with infinite balun and was hoping that some one either: Done it before or knows how to do it. I have built a model in comsol as seen in the...
View Articlenon-normal incidence boundary conditions
Hello, I'm very new in COMSOL and try to calculate a Corner configuration of a slab waveguide with the RF Module. I created a 2D model with a waveguide that has a 90 deg kink in the middle of the...
View ArticleIs there an easy way to create a high number of geometric components with a...
Hi all, I am using COMSOL 4.3 to simulate a 2D photonic crystal waveguide made of air holes in a dielectric (using the emw study of the RF module), and I wish to look at how roughness around the holes...
View ArticlePML refractive index
Hi, I am studying a model of Step index fiber and I want to put a cylindrical PML around the core. What should be the refractive index of the PML , should be same as refractive index of the cladding or...
View ArticleA spatially varying function does not appear to vary spatially
Hi! I'm using comsol 5.2a. I've found a function for results from another comsol file, and I'd like to use that function to describe it in another file in order to save file size and computational...
View ArticleTiO2 Absorption Spectra
Hi. I am studying the plasmonic effects of gold nanoparticles on a substrate (TiO2) and have successfully used the Scatterer on Substrate model to do this. I am able to produce an absorption spectrum...
View ArticlePlasmonic Resonance of Gold Nanoparticle
Hi all, I'm trying to model the plasmonic response of a gold nanoparticle in the presence of an electric field. I've got a model of a Au nanoparticle in a circular domain surrounded by PML layer and...
View ArticleHow to Calulate the Scattering Cross-section of Au Nano Dimers?
Hello all, I'm trying to calculate the scattering cross-section and the absortion cross-section of Au Nanoparticle Dimer (two NPs side by side of R=50nm), with a gap of 8nm, in Comsol Multiphysics....
View ArticleDomain-backed slit type condition
HI! I'm trying to model the light transmission from a source located between two dielectric mirrors. The attached figure shows the structure that consists in a multilayered structure with three...
View ArticleVariable static at zero
Hi. I had a similar problem a few weeks ago, but I believe this is different. Sorry if I'm spamming up the forum. I'm trying to see how a function varies. Forgive my mess, but I've uploaded my defined...
View ArticlePhotonic cavity heating
Hi, I am studying the heating process (and heat dissipation) in a photonic cavity. I started by putting a constant heat source, in a stationary study, which I then modulate in time domain, starting...
View ArticleRF module: lumped ports and symmetry planes
Hi all, Is it possible to use a symmetry plane (using a PMC in my case) that would cut in half a uniform lumped port? I only found an old post about that, saying that in Comsol 3.5 it was not possible...
View ArticleSingle Monopole Antenna
I'm trying to convert the monopole antenna array tutorial into a single monopole antenna to see the radiation pattern and find the impedance at the port, but when I disable the other antennas in the...
View ArticleERROR: Complex number encountered in real expression(when calculate the DEP...
Hello everyone: I use Particle tracing module for fluid to calculate the DEP force exerted on the nano-sized particles. When calculate the DEP I encountered a problem as follows: Complex number...
View Articlephotothermal or laser heating simulation in Comsol
Hi, I am new to Comsol. I am trying to simulate the temperature rising of the plasmonic structure during the laser illumination. Assuming the Electromagnetic wave plus the heat transfer will do the...
View ArticleHow to generate Radially polarized light in wave optics module ?
Hello I want to generate radially polarized light in wave optics module. Can anyone help me ?
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