Circularly Polarized Light Explained

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Күн бұрын

/ edmundsj
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How can light travel in a circle? In this video, we explore circular polarization, where the electric and magnetic fields of a plane wave trace out a circle in space. We also go over the Jones vectors for right-hand circularly polarized and left-hand circularly polarized light, and hopefully clear up some of the confusion around the conventions used.
This is part of my graduate series on optoelectronics / photonics, and is based primarily on Coldren's book on Lasers as well as graduate-level coursework I have taken in the EECS department at UC Berkeley.
Hope you found this video helpful, please post in the comments below anything I can do to improve future videos, or suggestions you have for future videos.

Пікірлер: 79

@chromax1619 4 жыл бұрын

ahahah i laughed so hard 5:23 that you were tryna say wtf politely

@myothersoul1953 2 жыл бұрын

That's the only part of the video I understood

@Serdy Жыл бұрын

Phenomenal. I'm so glad he didn't edit this part out.

@user-fh8vl2xg7u Жыл бұрын

5:20 Only this remained in my brain for the whole day 😂😂😂

@apoorvsom9120 2 жыл бұрын

Awesome explaination Jordan! Thank you very much. It helped me a lot for my physics exam

@Ana12956 4 жыл бұрын

Please make more videos . Very clear concise and useful information

@meetoptics 2 жыл бұрын

Agreed! The photonics community needs this kind of content

@SciencewithSteph 4 жыл бұрын

Thanks for this! I was looking for a succinct way to explain circularly polarised light and I ended up linking this video in mine to supplement my explanation of polarised light!

@meetoptics 2 жыл бұрын

Yeah, thank you so much for the explanation!

@shiroma8007 4 жыл бұрын

Very, very nice explanation. Thanks for being so clear and nice. About the elliptical polarised light, I could not find it. If you still have this video I will be glad watching this too.

@meetoptics 2 жыл бұрын

It is so good! Completely agreed

@meetoptics 2 жыл бұрын

Congratulations for being able of introducing this technology to society through these videos. This platform let us spread all we know about the field and from MEETOPTICS we are proud to be part of the photonics community and to help engineers and researchers in their search for optical lenses through our site. We celebrate every step forward.

@sumantchopde9039 3 жыл бұрын

Thanks a lot! I've an exam tomorrow and you cleared all my doubts! Very clear explanation!

@meetoptics 2 жыл бұрын

That's so great! Congratulations

@wolfy5825 2 ай бұрын

It's clear, short, efficient. Thank you very much !

@deepinmoutain Жыл бұрын

this is the best explanation! thank you!

@ishaankulkarni49 3 жыл бұрын

WTH hahahaah. most unexpected thing ever.

@ninakanska7124 5 ай бұрын

Gosh I love you. You explained it so so well. Saving my physics degree haha.

@caden7745 2 ай бұрын

Thanks man, appreciate it!!!

@vishnubishnoi4621 2 жыл бұрын

nicely explained

@subliminalvibes 4 жыл бұрын

Please can you explain why my polarised filter is able to block light in one direction and not in the other direction?

@pc...430 2 жыл бұрын

Hey, i really like your videos and I tried plotting waves in mathematica, but sadly it didn't work out properly. Could you upload the mathematica code? It would help me alot

@sahilvedpathak9046 4 жыл бұрын

Thanks a lot. Very helpful :)

@meetoptics 2 жыл бұрын

It is definitely 🚀

@poporbit2432 Жыл бұрын

Can the polarizer be modulated? IE change the phase shift within it via electric, magnetic or mechanical action?

@ketyaportela623 4 жыл бұрын

Thank you for your video. I'm a French student and there is no video of this subject in my language. Yours videos are very helpful!

@meetoptics 2 жыл бұрын

His content is so good.

@rajeshkumarb6226 4 жыл бұрын

Great dear Jordan.

@meetoptics 2 жыл бұрын

Agreed!

@jarredgrant1 2 жыл бұрын

Came for the video, stayed for "what the fuck"

@manmohanbisht69 3 жыл бұрын

Oops what the f. That was funny.. Nicely explained

@julianklimke3476 9 ай бұрын

good explanation thank you sir

@Edwinthebreadwin 2 жыл бұрын

This is very clear :)

@JordanEdmundsEECS 2 жыл бұрын

Glad you think so! What made it clear to you?

@megasharma2489 4 ай бұрын

Best explanation

@johnnybojan 4 жыл бұрын

I lost it at 5:23, hahah

@user-hm1nu3qg5g 2 жыл бұрын

I like the way of your lesson. Thanks a lot!!!

@meetoptics 2 жыл бұрын

It is so good!

@JordanEdmundsEECS 2 жыл бұрын

Thanks! What do you like about it?

@agrimmittal 3 ай бұрын

@@JordanEdmundsEECS straightforwardness :)

@whysoserious0609 2 жыл бұрын

You are better than Kasap optoelectronics book!

@KP-qk7jh Жыл бұрын

this is fantastic! thank you, Jordan

@kihoy2k 2 жыл бұрын

Hi, thank you for the tutorial. I have trouble understanding 8:12 when you factor out E0 and e^(jpi/2) the lower value becomes i, why not e^(jpi/2) ? Can you give some key words so that i can learn it from khan academy. Another question is where does that 7:03 k = 2pi/lambda come from ? Do you have video explaining it ? Sorry for the stupid questions.

@sapphireempress5419 2 жыл бұрын

Euler's formula gives e^i(x) = cos(x)+ isin(x). Since x= pi/2, the cosine function becomes zero while the sine function becomes one leaving only i. k is the wave number and that is a given formula of the wave number

@mtahirasam2447 9 ай бұрын

Jordan, Hope you will be fine. Can I get the mathematica file of this circularly polarized wave?

@Saptarshi.Sarkar 4 жыл бұрын

Can I get the Mathematica code?

@pllagunos 3 жыл бұрын

Damn that Mathematica plot is cool! Could you share it? I've been trying to replicate it, but so far I haven't been successful

@BeeDootube 3 жыл бұрын

If anyone could help me, I have a question. I have to plot a circularly polarized wave and, if I'm not mistaken, the resulting wave is a combination of two waves E_total = Ex e^(kz-wt) x_hat ± i Ey e^(kz-wt) y_hat, where we have a real wave in x and an imaginary wave in y. Is that correct? If it is how can I plot the imaginary part? Because, as long as I know, this part will dictate the rotation and the shape of the wave.

@jordanedmunds4460 3 жыл бұрын

You're 90% of the way there. The trick is that you have represented the wave in phasor notation. The "real" (physical) solution should have only real-valued electromagnetic waves, so you need to take the real part of *both* the x and the y component. But isn't the real part of the y-component zero? No, because its phase rotates. Take z=0 and plug in different values of t. at t = pi/(2*w), the y-component is purely real, and the x-component is zero. The "real"/"imaginary" convention just makes it easier to do math on stuff and keep track of the relative phase (or physically, the offset or delay) between the x and y components.

@BeeDootube 3 жыл бұрын

@@jordanedmunds4460 Thank you very much! I'll try to do as you say and will be able to give you some feedback later.

@lebihkerendariTomCruise 3 жыл бұрын

does anybody here know why dbi convert to dbic have to -3 db???

@gergeselhaber4770 2 жыл бұрын

5:25 HHAHAHHA

@sahhaf1234 6 ай бұрын

@10:15 No videos on elliptic polarization???

@arfathq8069 2 жыл бұрын

5:24

@CarlosRuiz-pt5ub 4 жыл бұрын

I have a stupid question, why we multiply the J vectors for RHP and LHP by 1/sqrt(2)?

@incianali 4 жыл бұрын

I think that's to normalize the vectors. So, to make the length of them add up to 1. But I'm confused with the RHP light since the length would be 0 since i^2=-1 so 1/2-1/2=0.

@incianali 4 жыл бұрын

Understood it now: it's because we don't simply square it. We multiply it with the complex conjugate!

@sophiavei1752 3 жыл бұрын

can anyone explain the kind of polarization of (-i, 1)? (written in a column, of course, and without 1/sqrt(2). thanks! :)

@luca3976 3 жыл бұрын

thats also circular polarization, only that the electric field in x direction is delayed with lambda/2 to the electric field in -y direction. (i think.. xD)

@sophiavei1752 3 жыл бұрын

@@luca3976 thank you! That's what I thought too. It's just that there are so many variations on the way you can refer to it.

@caghey 8 ай бұрын

i couldn't find the elliptically polarized light video :(

@muhammadhamzashahid9649 2 жыл бұрын

Please give me the code of wolform graph!

@eugenetruman721 4 жыл бұрын

Great explaining. Too bad there is no elliptical polarization video.

@meetoptics 2 жыл бұрын

It is an amazing explanation!

@psyrene4894 4 жыл бұрын

Why aren't you interested into the exp(...) part? Like I don't get it because withouth the exp(..) we just don't know thats its circular polarized cuz (1,i) ist just a constant and not a wave?

@JordanEdmundsEECS 4 жыл бұрын

It definitely still needs to be there, it’s just that dragging it around everywhere is kind of a pain. Once you’ve written the same thing 10-15 times it starts to feel unnecessary and annoying xD so by convention people don’t write it.

@blugreen99 10 ай бұрын

All videos ignore how the magnetic field gets thu all polarizers horizontal and vertical. It tags along with the electrical component There is only wave not2 waves.......... 1 wave with 2 compnents inseparable.