How to remove radiations in silicon substrate in the simulation?

I designed a plasmonic slot waveguide using gold on top of the 2 micron oxide layer and below the oxide layer, I used silicon as substrate. the idea is to optimize the waveguide dimensions (slot...

01 November 2020 4,400 3 View

How to calculate the group velocity using Comsol?

Hi, I designed the cross section of the plasmonic slot waveguide using wave optics module in comsol. I used mode analysis method and now I am going to calculate the group velocity of my structure....

22 September 2020 2,660 3 View

Is there a scientific team working on a distribution model for the novel coronavirus?

As it's generally understood, the virus spreads on droplets and other particles in the air and there are different estimations for the furthest distance this could travel. There are different...

26 May 2020 289 1 View

Can any one know how the mode excited in mode analysis study within Comsol?

I want to know how the modes are excited when we use mode analysis study in Comsol? when we use boundary mode analysis in Comsol, the modes excited using ports we create. what about the excitation...

23 May 2020 529 9 View

How to optimize the parameters of slot waveguide using COMSOL?

I designed a plasmonics slot waveguide using Comsol but I want to know the steps of optimization of evanescent field ratio(EFR) versus slot height and width. The problem is with the increase of...

18 March 2020 3,222 6 View

Relation between the effective mode index and the attenuation coefficient?

can any one know about the relationship between the effective mode index of a mode and its attenuation coefficient. I want to calculate the propagation length of plasmonic slot waveguide I...

08 March 2020 7,159 6 View

How can I calculate effective mode index of waveguides analytically?

I am simulating slot waveguide using mode analysis in wave optics module performed in COMSOL multiphysics. I got the results and also the effective mode index for our mode. however, when I...

26 February 2020 8,434 4 View

In MRI how does magnetism vector go to xy plan?

In MRI after applying 90 RF puls magnetic momentum vectors of protons flip to xy plan. I can understand this from classical mechanic point of view. But I cant understand it from quantum mechanic...

28 January 2020 5,105 3 View

I am wondering how can I do some modifications on lithium Ion battery model by simscape Matlab?

Currently, the blocks in the model are look up tables with two inputs (Temperature , SoC) (the link is attached). I want to modify the resistors to have three inputs (T, SoC, and Cycles). But, I...

12 August 2019 8,259 1 View

Have you ever checked "voice" in your professional writing?

For instance, the way you present the persona.What factors affect your "voice" ?

03 September 2018 8,969 4 View

What is Flat Lens Antenna?

28 February 2021 5,433 3 View

Can impedance of antenna be less than 50 ohms?

I am simulating helix antenna in hfss, right now, giving excitation with 50 ohms port. When I see the results of Z parameter (real). It shows lower than 50 ohms. Do not understand, if it can be...

27 February 2021 4,218 7 View

Helix antenna coupling problem?

Dealing with a helix antenna, made with flexible material and not rigid like using a PCB board or wire. At the beginning of the helix is too close to the ground plane, causing coupling. How can I...

21 February 2021 4,453 3 View

Which method need to be used to predict crack propagation?

Need to predict the crack propagation phenomenon in a CI component. Suggestions are needed regarding the the methods ( XFEM, J integral, etc.,) which will predict the crack propagation behavior...

06 February 2021 1,936 4 View

What is the damping coefficient of Well's/impulse turbine that may be introduced into a mechanical oscillation model to simulate the PTO damping?

In tank experiments, it is easy to simulate the PTO damping by the use of orifices, however in modeling full scale and real conditions the trurbine damping coefficient must be added to the water...

31 January 2021 7,325 1 View

How to solve 1-D Wave equation?

Good day, In standard PDE literature, there are a lot of solution approaches for the 1-D wave equation initial-boundary value problem. One way is with separation of variables. Below I describe...

25 January 2021 4,876 3 View

What do you mean by 'excitation' of a plasma wave? What is the physical significance of this 'excitation'? Why is it necessary?

I have read numerous research papers on various mechanisms of excitation of surface plasma wave. But why do we need to excite a wave? Is it necessary? Can't the wave propagate without being excited?

25 January 2021 3,790 3 View

I am working with crack propagation along with delamination using ABAQUS. Wether crack will start from a delaminated portion (cohesive crack) by XFEM?

I am modelling a SENB Beam with an interface. The interface is modelled with cohesive elements to permit delamination. The carck in the continumm is taken care by the XFEM. My doubt is the crack...

19 January 2021 4,827 1 View

What type of spectral radiation has greater penetration on materials, UV or IR? What book or source do you recommend for information on this?

I need information concerning the penetration and reflection capacity of ultraviolet and infrared radiation wavelengths on different most common materials. Edit. Can somebody recommend a book to...

16 January 2021 8,051 6 View

Is stabilizer good to use while designing an antenna using fabric?

13 January 2021 2,473 4 View