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Questions related from Mostafa Shabani
how can we create these plots? a 3-dimensional look and showing strength with colour, which software does create these pictures? source of image: Directive giant upconversion by supercritical...
03 April 2024 9,885 4 View
Is it possible to grow graphene on the vertical wall of a structure, for example on the vertical walls of a SOI waveguide?
10 March 2024 1,954 2 View
How much is possible to concentrate a laser beam on a plane? For example is it possible to concentrate 4 laser beams on 4 close spots on a surface equal to 1 mm^2 without interference?
27 January 2024 9,516 3 View
Hi, Does anybody know how atlocal command in Comsol works? I use coordinate but I can't get any result Thank you,
25 December 2023 9,934 4 View
Is it correct to use the "Caughey-Thomas Mobility Model" in the simulation of MOSCAP semiconductor devices? this model is field-dependent and decreases the mobility of the carriers.
22 December 2023 6,443 1 View
How can we numerically calculate integration like this in the picture, in which the denominator of the function becomes zero? any help will be appreciated. This kind of integral usually appears...
15 December 2023 8,270 2 View
Is it possible to build two or more kinds of doped silicon on each other? For example, building a 1 um p-doped silicon on 1um n-doped one? while they have been separated by an insulation layer?
24 November 2023 9,415 1 View
What is this kind of differential equation and how can it be solved?
03 August 2023 7,461 4 View
Is it possible to create a random 2- dimensional shape using mathematical equations Or in software like 3D-max and AutoCAD? like this one:
30 July 2023 9,479 3 View
Is there any software to calculate the MOSFET capacitors, especially when the structures are complex? considering the fact that the speed of these devices is dependent on the capacitors formed in...
29 April 2023 7,157 0 View
Hi, I'm calculating a numeric integral using vpaintegral() in Matlab, but it can not be calculated. Does any body know why? This is the function: fx =...
27 January 2023 688 1 View
How the integral in equation 1 is calculated into equation 3 depicted in the attached picture using equation 2?
16 January 2023 9,835 2 View
Which simulation software is better to simulate optical ring resonators? COMSOL, Lumerical, Rsoft ? or OptiFDTD? considering that ring resonators simulation is very dependent to RAM memory and...
27 October 2022 495 1 View
How is possible to calculate Ruess Young's modulus for a composite with three layers? As I know the Ruess young modulus for two layers is calculated from the equation below:
04 June 2022 6,267 1 View
What is the relationship between the polar moment of inertia and the torsional constant?
15 February 2022 3,939 1 View
How can I get the equivalent(effective) Young modulus and Poisson ratio of a multilayer structure? A structure like the below picture. the structure is consists of Si, Al2O3, and Al metal thin...
30 January 2022 3,382 3 View
In the Comsol reference manual moving mesh is suggested for solving RF MEMS switches. But the problem is more consistent with deforming geometry because usually the space between membrane and...
26 January 2022 8,357 5 View
how I can find the effective mechanical properties of a multilayer structure, specifically the elasticity of a multilayer structure? I'm simulating a multilayer membrane RF switch. the membrane...
25 January 2022 6,619 2 View
Are optical properties of a-silicon and poly-silicon different? especially their refractive indexes
19 January 2022 7,958 10 View
how can you derive the lumped element circuit model for resonators used in designing metasurfaces? numerically or theoretically?
28 December 2021 9,838 2 View
What are the in-plane and out-of-plane permittivity of a dielectric? for example, I have read that the in-plane permittivity of the graphene is equal to 1+j*sigma/(eps0*omega*tg) (sigma:...
10 September 2021 4,511 5 View
Is it correct to Use deforming geometry instead of deforming mesh for simulation of an RF MEMS switch for the dielectric(air) under the switch bridge? the simulation is done using COMSOL multiphysics.
25 July 2021 9,122 0 View
how to calculate the capacitance of an RF MEMS switch when it is in the down-state? in fact after the PULL-IN voltage the FEM model hasn't solution anymore. how to solve this problem?
27 June 2021 6,834 2 View
In Comsol Multiphysics I don't know where I can find an example for this practice, I want to know which variable must be used in the case of domain, boundary, and point. in detail. which I...
11 June 2021 9,971 3 View
Is there any simulation tool or any theoretical relationship related to this issue? Is there any specific Comsol module for this?
05 June 2021 4,001 1 View
I have tried to regenerate the result from drude-lorentz model in the article "Ultra-broadband THz time-domain spectroscopy of common polymers using THz air photonics". The dielectric number of...
17 January 2021 4,693 2 View
