Do guided modes in metal waveguides travel faster than the speed of light? Many think so.
This short video illustrates what is happening in a metal waveguide that leads to this somewhat false conclusion. It turns out it is only the interference pattern of waves bouncing around in the waveguide that travels faster than the speed of light. The waves themselves are travelling exactly at the speed of light. Due to the angle the waves are bouncing around, the overall speed through the waveguide is slower than the speed of light. I think the visuals in this short video will help reconcile any confusion.
I hope you enjoy this video!
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