# Questions tagged [waveguide]

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### Two Dimensional Hodge Decomposition

In deriving the equation governing propagation of wave in a wave guide, a specific form of Hodge decomposition theorem is used. The Hodge decomposition theorem applied in two dimensions allows us to ...
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### Why do we use wires/conductors to transport energy?

I am currently studying Maxwell equations and I learned that copper wires are essentially just wave guides for EM waves. Why do we not use an insulator to guide the wave and transport the energy which ...
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### How to get single mode propagation using the Wave propagation method?

I am trying to simulate single mode waveguide using wave propogation method but when launching the beam inside I get the Tablot effect (like in MMI). I have adjusted the refractive indexes and the ...
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### Steven Weinberg says $L$ is the fundamental EM wavelength in a cubical cavity $L^3;$ not the typically asserted $2L.$

This is from Steven Weinberg's Lectures on Quantum Mechanics, 2nd Ed., page 2: For instance, for a cubical box of width $L,$ whatever boundary condition is satisfied on one face of the box must be ...
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### How is certain area of waveguide becomes visible to user?

I was reading an article and came across this image As shown, image becomes visible to eye after reaching a specific area of the glass. But how does it work? Why is it being reflected at such a weird ...
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### Validity of flat coupling approximation in input-output theory + why is it called Markov approximation?

In standard input-output theory, we model the interaction between light and a two level system by the following hamiltonian which assumes rotating wave approximation: The interaction between a ...
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1 vote
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### Can a metallic rectangular waveguide support hybrid modes?

Studying the basics of guided waves in metallic rectangular waveguides, filled with homogenous dielectric material, I see that there is always a distinction between TE and TM modes. I understand that ...
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### How is magnetic flux viewed in QED?

I know that QED is formulated in terms of Lagrangian density. So when we solve for a physical system we ultimately ends up finding $\psi$ and $A_{\mu}$. I'm not interested in $\psi$ for now. Since I ...
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1 vote
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### Magnetic Field Distribution in TEM (TransverseElectroMagnetic) Modes

in many books (Electromagnetics, M. Notarov; Foundations for Microwave Engineering, Collin; Microwave Engineering, Pozar etc) I have read that in a certain waveguide or transmission line, the ...
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### Why is the magnitude of the electric field dependent only on $x$ and $y$ coordinates?

So I am reading a book on electromagnetism and in it they are assuming that the magnitude of the electric field is dependent only on $x$ and $y$ coordinates in a waveguide and I wanted to know why ...
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1 vote
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### Is there a subterranean SOFAR channel

After discovering the SOFAR channel in water at a depth which the speed of sound is at its minimum and acts as a waveguide, it was postulated that a similar channel existed in the atmosphere and ...
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