Near field simulation
Hello I am a new user of Comsol. I am trying to visualise the near field enhancement (E^2/E0^2 or normE^2 variable inside comsol) of plasmonic nanoparticle (Silver) using either wave optics or RF...
View Article"Plasmonic Wire Grating "3 d model
Hi,Excuse me, comsol5.0 case "Plasmonic Wire Grating "3 d model in the simulation of the specific steps?thank you. Plasmonic Wire Grating (Wave...
View ArticleModelling fluorescence enhancement near a gold nano-particle
I am trying to model the fluorescence enhancement and quenching near a gold nano-particle. So far I have created the particle and get the expected electric fields at resonance conditions when sending...
View ArticleProblem with 3D meshing for thin layer with PML layers
Dear all, I met a problem with 3D meshing for high aspect ratio component and could you please help me? Thank you so much! 1. Model structure: As attached figures, the basic structure in physical...
View ArticleSurface plasmon Excitation
Sir... I need help for analyzing the graph obtained on simulation. i want to find SPP excitation on thin gold film.is it zero order reflection obtained on the below graph leads to SPP Excitation ,? can...
View Articleelectrical conductivity of Rice husk
sir on a reference paper ( attached below) shows that electrical conductivity of RIce husk as 24 sigma cm. it means 2400 sigma m. is it is correct value. for studying microwave absorbing property of...
View ArticleWhat does a S-parameter larger than 1 means?
I have a structure with 2 ports and periodic boundaries on the walls. In one port, excitation is on and in the other one, it is off. When I compute, I get a s-parameter of 1.5 for the transmission. I...
View ArticleCalculating TM waveguide mode in numeric port
Dear forum. Thanks for always giving me good instinctions. I've modified dielectric_slab_waveguide.mph from comsol user library. (RF 2D model) And I find that when I use 'Boundary Mode Analysis', I...
View ArticleConvergence issues in frequency-transient model
I am simulating heat generated in a nanostructure due to dipolar source at a specific distance from the structure. The model actually converges with the stationary solver but fails to converge when I...
View ArticlePhotocurrent calculation in RF module
Greetings I have a solar cell (silicon brick) with metallic rods on the top surface. This is well known structure to enhance the solar cell responsivity with plasmonic effects. So I want to calculate a...
View ArticleHow to collect charge developed in piezoelectric material?
Hey! I am working on energy harvester. I am facing some problems. Anyone would help me? 1. which study and physics I should use for piezoelectric material.? 2. How can I characterize the static and...
View ArticlePCF Desigh, getting zero in the imaginary part of effective index.
Hi, I get zero in the imaginary part of effective index, is it because the precious setting is not correct, or is a problem caused by setting the imaginary part of refractive index of Silica glass to...
View ArticleSolving nonlinear problem using parameter sweep
Hi, everyone! I am struggling to solve some nonlinear optical problem (the material has 3rd-order nonlinear optical response to the electrical-magnetic field) using Comsol RF-frequency domain module....
View ArticleOscillating electric dipole source Comsol RF module
Dear All, I have question. I do simulations of plasmonic gap nanoantennas, and I want to excite antenna with dipole source which is placed and oscillate in the middle of the gap. I have questions....
View Articlenonlinear refractive index
Hello COMSOL Community, How can I determine the value of the nonlinear refractive index for an geometry i build in COMSOL? Best wishes, Fabian
View ArticlePeriodic port angular incidence depends on model size
I have made a 2D model simulating the dependence of EMW transmittance trough small slit from the angle of incidence. Wavelength is 5um. I have a periodic port which generates Hz plane wave. Also, I...
View ArticleSome problem about antenna electric field
Hi everyone I want to simulate the antenna electric field intensity. but the result is too small and strange. I need to try the impedance boundary or some other ? the file is too large so I add some...
View Article"Plasmonic Wire Grating "3 d model
Hi,Excuse me, comsol5.0 case "Plasmonic Wire Grating "3 d model in the simulation of the specific steps?thank you. Plasmonic Wire Grating (Wave...
View ArticleComsol 5.0 FEM linear system right hand
Hello, I am trying to extract the FEM matrix equation from a RF problem (stationary solver) using matlab commands, i tried the mphmatrix to get stiffness mass or damping matrices, but i can find the...
View ArticleGaAs Solar Cell; Semiconductor Module + RF Module
Hi there ! So this is my problem ... I get this Error Message (Error message is "Maximum number of Newton iterations reached."); "Doesn't Find Solution... I'm new with this software and i just throw...
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