This video gives a brief introduction to evanescent waves which arise at the interface of two media when light travels from one to another and is reflected back.
Dude, I loved your explanation. You realize that there are not many people in this world who have made this information clearly accessible on TH-cam right? So you have done a good service.
usually when I see educational videos on youtube made by my fellow countrymen, I feel frustrated as most of such videos focus on explaining the phenomenon in question in a very crude incomplete manner and targeted on cracking some entrance exam. THIS IS ONE OF THE VERY FEW GOOD VIDEOS MADE BY INDIANS, which tries to EXPLAIN STUFF PURELY FOR UNDERSTANDING AND DONE COMPLETELY with a good presentation
That was a very clear, thorough explanation! The pace was really great to follow along with and this helped me understand this way better! Thank you for the great video!
Usually such kind of practical explanation is given by foreign especially teachers from western countries. But this particular video by my a person my country is really awesome and outstanding.
It is sometimes tricky to rely on educational videos on YT, but this one was really great! Perfect speed for maintaining both my concentration and my understanding high :) Thank you.
Thank you so much! This is such a clear and informative video. It leads you right to the answer! I love it! My only question is if light waves are generated from the evanescent wave when it goes into a medium of the original refractive index, how can it be total internal reflection? Some energy must be lost t the evenescent wave, correct?
Can you please tell me the software you used to create this video ? .. it's a great explanation...I was studying stumbled upon this video,liked the way of representing.
Cool. What is the phase of the couple evanescent wave after it is coupled into the medium that is brought close to it compared to the incident and reflected fields in the TIR medium?
Wow a fantastic explanation! A couple of questions: 1) When light hits a metal, there's a certain "skin depth" associated with the metal -- how far the light can travel inside the metal before it attenuates by a certain amount. Do evanescent waves have something to do with this? 2) In general, is any attenuation of waves attributed to evanescent waves? I.e. any time there's attenuation happening, is there an associated evanescent wave?
Question...if the right side refractive index is greater than the left side will the evanescent wave even form? And, if so, will it still flow in the right side medium with some of the refracted or transmitted wave or be inverted back into the left side with the primary incident wave and flow as a real evanescent wave within the envelope of the primary?
At 5:22 what happens to the negative square root? I appreciate it would give exponential increase but wonder if there is any other justification to exclude this additional solution.
Hellow sir, thanks for your video, I just want to know, at 3:54, what do you mean by "y does not affect anything that is happening on this plane", so when sin is over 1, you said it is a real number. How do I comprehend that sin could be greater than 1, and it is still a real number. Thank you again.
Sine the assumption of sin(theta_t) >1 doesn’t hold true, how can we justify this approach? I am having trouble wrapping my head around this idea…. Can someone help me?
The impossibility of satisfying the boundary conditions (BC) is not satisfactory as an explanation of the evanescent waves. How/Why are these waves created? The wave itself does not know about boundary conditions, these are just mathematical tools to describe the whole situation. What exactly happens when a wave that cannot satisfy the BC hits the wall? Neither the wall nor the wave do know about the BC, what is the microscopic cause of the exponential damping occuring?
Dude, I loved your explanation. You realize that there are not many people in this world who have made this information clearly accessible on TH-cam right? So you have done a good service.
usually when I see educational videos on youtube made by my fellow countrymen, I feel frustrated as most of such videos focus on explaining the phenomenon in question in a very crude incomplete manner and targeted on cracking some entrance exam. THIS IS ONE OF THE VERY FEW GOOD VIDEOS MADE BY INDIANS, which tries to EXPLAIN STUFF PURELY FOR UNDERSTANDING AND DONE COMPLETELY with a good presentation
Hands down the BEST video on evanescent waves. Just leaving this so other people watch as well. Well done and thank you!
Great explanation ! You saved tons of time in my acoustics assigment
Thank you Dhananjay Varma for uploading this video. The best explanation ever!
That was a very clear, thorough explanation! The pace was really great to follow along with and this helped me understand this way better! Thank you for the great video!
Usually such kind of practical explanation is given by foreign especially teachers from western countries. But this particular video by my a person my country is really awesome and outstanding.
It is sometimes tricky to rely on educational videos on YT, but this one was really great! Perfect speed for maintaining both my concentration and my understanding high :) Thank you.
Never seen such a good video explaining this topic.
bro U are really great on explanation!!! thank U for being my saviour to do my final project
Best explanation so far....
Great video with a simple explanation of this topic. Thank you very much!
Your voice is really good and professional.
Thank you, very clear explanation.
Great work.....read a lot but only here found simple & effective explanation.....(y)
very well explained, thank you!
Excellent explanation!!
Wonderful Explanation. Thanks a lot.
Thank you so much! This is such a clear and informative video. It leads you right to the answer! I love it! My only question is if light waves are generated from the evanescent wave when it goes into a medium of the original refractive index, how can it be total internal reflection? Some energy must be lost t the evenescent wave, correct?
you killed this explanation man
Very well explained.
great explanation!
Can you please tell me the software you used to create this video ? .. it's a great explanation...I was studying stumbled upon this video,liked the way of representing.
Nice one and
very helpful
Very- very good explanation
Superbly explained! Can you suggest a reference book that you followed?
Cool. What is the phase of the couple evanescent wave after it is coupled into the medium that is brought close to it compared to the incident and reflected fields in the TIR medium?
Thank you so much sir....It's really helpful..Can you please explain suppression of the surface wave in TE and TM mode
thank you for the explanation
Great explanation
Super helpful! Thanks :)
Wow a fantastic explanation! A couple of questions:
1) When light hits a metal, there's a certain "skin depth" associated with the metal -- how far the light can travel inside the metal before it attenuates by a certain amount. Do evanescent waves have something to do with this?
2) In general, is any attenuation of waves attributed to evanescent waves? I.e. any time there's attenuation happening, is there an associated evanescent wave?
Thanks for the help
Question...if the right side refractive index is greater than the left side will the evanescent wave even form? And, if so, will it still flow in the right side medium with some of the refracted or transmitted wave or be inverted back into the left side with the primary incident wave and flow as a real evanescent wave within the envelope of the primary?
very good explanation...
Thanks a lot !
THANKS!
Thank you!!
Is it connected to Quantum tunalling of particle through potential wall ???
Though great explanation 👌
is it possible that sinus can be higher than 1??
Interesting!!
At 5:22 what happens to the negative square root? I appreciate it would give exponential increase but wonder if there is any other justification to exclude this additional solution.
The E-field will blow up towards +z. Which is not physical.
Great video
Thank you so much! :)
From where you got the equation for transmitted wave initially.
Hellow sir, thanks for your video, I just want to know, at 3:54, what do you mean by "y does not affect anything that is happening on this plane", so when sin is over 1, you said it is a real number. How do I comprehend that sin could be greater than 1, and it is still a real number. Thank you again.
Thanks
How's sin(thetaT) a real number when cos(thetaT) is not?
Nice presentation thanks
Thanks a lot :)
@@dhananjayvarma7620 hello sir greeting of the day..actully i am working on same topic so can we chat on mail ..??? plese send me yor mail id.
Nice 👍🏻🙂
nice
Sine the assumption of sin(theta_t) >1 doesn’t hold true, how can we justify this approach? I am having trouble wrapping my head around this idea…. Can someone help me?
The impossibility of satisfying the boundary conditions (BC) is not satisfactory as an explanation of the evanescent waves. How/Why are these waves created? The wave itself does not know about boundary conditions, these are just mathematical tools to describe the whole situation. What exactly happens when a wave that cannot satisfy the BC hits the wall? Neither the wall nor the wave do know about the BC, what is the microscopic cause of the exponential damping occuring?
Thanks