Lecture 22 (EM21) -- Slow waves

[@dalarev9858]

Wow, what a lecture. Fascinating topics.

[@empossible1577]

It is a very cool topic!

[@armourggeddon]

an absolutely fantastic aid and teacher. thank you.

[@empossible1577]

Thank you!

[@armourggeddon]

@@empossible1577 was very helpful with understanding key parts of slow light for my senior physics presentation thanks!

[@localfuture1484]

Hi, Here you mention that "Phase Velocity can approach Infinity in a waveguide". And in another youtube lecture "Dispersion: Phase Velocity Versus Group Velocity, PHYS 372" by Stephen Remillard, it's mentioned that "Group Velocity can approach Infinity as well " (18:11, kzbin.info/www/bejne/baC2oYSvbpqVY6c). So Can I conclude that both Phase Velocity and Group Velocity can exceed the speed of light?

[@empossible1577]

There is also energy velocity! LOL Phase velocity routinely exceeds the speed of light. In fact, I recently made a video about this for guided modes in a rectangular metal waveguide. kzbin.info/www/bejne/oJvYapWgmJVpbdEsi=CeQOqdf74hUg6Jqi I am aware that group velocity can also exceed the speed of light, but I am unaware of energy or information moving faster than the speed of light.

[@behroozsemnani289]

Thanks for your great lectures

[@empossible1577]

Thank you!