Comsol Step by Step: Refraction, Total Internal Reflection

[@VasanthanDevaraj]

Even after 11 years, this tutorial is much helpful. Thanks to the creator

[@mohamedmoumou6682]

Good day Sir, I am new to COMSOL. I want to model a point source from which Electric Field spreads out in x,y directions. I am working in 2D plane. I started of by creating a geometry with air, and then specified my point. How do I assign electric field to my point? Any help would be greatly appreciated. Regards

[@jiaweishi7226]

You did something that is really meaningful, thanks!

[@TheGoodphy]

Thanks! I have some complaint that the there is some jump when contents is followed especially during tutorial of simulation geometry design. It made me irritated. However, generally very helpful tutorial! This video is absolutely my first kind of teacher for COMSOL!!!

[@aprilyang828]

Hello, Thanks for your tutorial. But I have a problem now. I want to download your file of video in your website, but it's not available now. And my main problem about this simulation is that I have done it step by step, but the result isn't the same,I don't know why.

[@yuchenyang920]

Hi, Thank you for sharing! Have you simulate surface plasmon polariton in COMSOL?

[@live4Cha]

lol

[@arifibrahim3724]

Very good video please upload more video in other different fields if possible

[@jacobm244]

thank you very much for your excellent tutorial. I watched the whole series. Im doing research for my master thesis. Im trying to build diffraction grating for ultrasound but I wasn't able to do it so far ;( I have less than 2 weeks to submit the proposal and I need to show some preliminary results. could you please post a tutorial about this project or any thing can help? im using lambda 0.4mm and the pitch of grating is also 0.4 mm. the sound wave should strike the grating at some angle, then there is mirror behind the grating which will reflect the wave and send them back through the grating, then we need to see the pattern in front of the grating. you are very expert and im sure this is a piece of cake. Im looking to hear from you soon please

[@leepm7612]

Can you demonstrate by using COMSOL 5.2?

[@madhupriyag6673]

Thank you it was very helpful

[@mousytom1332]

I am a little confused... Why is the wave Z component set to 1?... I thought the wave component determines the wave direction so should be X = 1 because Z is pointing out of the page. Could someone explain this?

[@zakariaettaki1106]

hello I have a study 3D to make with comsol and I dont know how to do it I have two attached walls one of concrete and the other of wood and between them there's a small defect of air that makes a detachement between the wood and the concrete I appllied heat flux from the concrete about 2000w/m2 and a 25 degC temperature from the wood after computing normally i should have stain that represent the detachment in outsiide surface of wood which I dont can u please help me and thank you.

[@nabtoulousain8875]

Hello, thank you very much is very clear i need your help if we have several objects with different optics index.how to change the optics index in Comsol (from experimentals i have spectra of reflectivity for each object) i wait your answer and thank you very much

[@ElizabethGreene]

Nab Toulousain Hello. Can you do it with a Parametric Sweep? Add a global parameter for the index. Set the material property to your index variable. Then add the indexes as a table to the Parametric sweep in the study. Best of luck!

[@xelarutra]

This doesn't work in Comsol 4.3b. I guess I have to use Port option instead of Electric Field. But in this case the model doesn't work What is wrong?

[@claudiawidmann2135]

Hey! It would be nice if you could do a Simulation of a dipole, placed in a nanopillar. How the light is coupled out of the nanopillar (Diameter sweep 100nm-300nm for example) and how big is the light intensity if the light is then collected with a objective with NA=0.9?

[@SuperAliez]

gracias! muy buen video y entraré a tu pagina para más información!

[@ElizabethGreene]

Hello. I received a php error when attempting to download your .mph sample. Thanks!

[@birds-and-garden]

thank you

[@bluetable933669]

thank you so much. yes interested in your work n tutorials :)

[@ElifAvinca]

Can this video send to me as mph file? please. And I want to examine your PhD thesis if you share with me I would be very pleased. Thanks for this video :)

[@nurulnadia1938]

Hello. Can anyone help me? my research is about optical devices based on micro-ring resonator. i already design micro-ring resonator in 3D but i don't know how to set up the physics,mesh and so on, because there is no tutorial..

[@sssleyer]

That is why it is called "research" no?

[@sssleyer]

That is why it is called "research" no?

[@cutesruthi]

thank u so much...its very informative...:)

[@cutedow]

who can tell me that how to make the "field of wave" chart??? thanks

[@alexandergovyadinov1805]

The field patterns produced by this model are completely wrong. To see this, just calculate/search web for the Fresnel reflection/refraction or turn both dielectric areas into air. This tutorial should be used only for illustrative purposes and should would be nice if Author explicitly mentioned this. Otherwise, it is very misleading and even dangerous, specially for inexperienced users. Just a note for all starting Comsol users: ALWAYS check your models with well known special cases, such as plane wave in vacuum, Fresnel reflection, scattering by a small sphere, etc. Otherwise you can easily get garbage and won't even know about it.

[@thgmansur]

This is the old saying:"garbage in, garbage out". Very good advice!

[@live4Cha]

i don't think your simulation is right. regardless of the angle of incidence we get always reflection at boundary with diff dielectric, second how is this accounting for the surface plasmons? Looks like a toy to me not a serious tool to model real problems. sorry!

[@151anja]

Cmon man, where do you expect to see the reflected beam? :) The simulation cell is obviously too small for that. But the wave fronts that are parallel to the medium boundary indicate the superposition of the incident and the reflected beam in quartz (you can do the math: E^(ikr-iwt)*E^-(ikr-iwt) for the exact geometry), so the reflected beam is definitely present, you just have to know what you're looking at. Also, the surface plasmons appear only if the dielectric function changes sign (check wikipedia or something), which wasn't the case here.

[@alexandergovyadinov1805]

I agree with David, the model presented here is completely inadequate, disregarding the domain side.