# Questions tagged [polarization]

Polarization characterizes the oscillations in time the electromagnetic field is doing in the plane perpendicular to the propagation direction of a wave

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### Molecular polarizability equation check

ChatGPT gave me an equation to calculate the molecular polarizability using the fluctuation of the dipole moment components, but I can't verify its validity because it gives me a made up reference. I'...
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### Link between photon helicity and polarization of $A^\mu$ electromagnetic potential

From Wigner theorem we know that the irreducible unitary representation of the Poincarè group for massless and spin 1 particle is labelled by the momentum $p_\mu$ and the two possible helicity $+1,-1$ ...
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### Polarization analyzer [closed]

My understanding is that the entanglement between two photons is not broken by a polarization analyzer. One will emerge from the Y projector and one will emerge from the X projector. Is this correct?
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### Displacement current and magnetic field in capacitor with dielectric

I have a capacitor with round plates of radius $r_{2}$ kept at a distance $d$, with a voltage $V\left(t\right) = V_{0} \cos \left(\omega t\right).$ Inside, there is cylindrical material with a certain ...
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### Is there any specific terminology for this type of current in spintronics?

In spintronics, there are several types of currents: Spin-polarized current: The two spins flow in the same direction with unequal contributions. Perfectly spin-polarized current: Only one species of ...
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### Why does an atom become positively charged when it shares its lone pair?

Why does an atom become positively charged when it shares its lone pair? In NH3, Nitrogen doesn't get positive charge when forming covalent bond with Hydrogens. But why does it get positive charge ...
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### Difference between polarization angle and poling angle in piezoelectric material

I was reading the research article: Demonstration of optimizing piezoelectric polarization in the design of a flextensional actuator, where I had confusion differentiating between poling angle, which ...
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### Confusion on the definition of dielectric permittivity

I don't understand how we're defining the dielectric permittivity, sometimes it's defined as the ability of the material to resist the electric field and sometimes as the ability to permit the ...
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### Does the creation operators for photons with different polarization commute?

Let $\hat{a}^{\dagger}_{\sigma}$ be the creation operator of a photon with the polarization $\sigma$ towards some reference. What are the commutator relations for the creation operators of a photon ...
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### Average polarization of photons and lasers

Sunlight is made up of photons polarized in many directions, so it is derived that sunlight has a 50% chance of passing through a polarizing filter at any angle. My question is, if you know 50% of ...
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### Bound Charges in Polarized Material

I'm currently working my way through chapter 4 of Griffith's Introduction to Electrodynamics (4th ed) and I ran into an issue with his notation. In chapter 4 sectin two, when calculating the electric ...
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### Polarization by Polaroid [duplicate]

A Polaroid is made up of slits aligned in a specific direction. Before passing through the Polaroid, electric field and magnetic field vectors of light (suppose from a bulb) aligned in random ...
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### Does Slightly Polarized Refracted Light Remain Polarized after Exiting Glass?

When unpolarized light travels from air into a glass slab, the reflected light is polarized if the incident angle is equal to the Brewster angle. This is clear to me. However, according to Wikipedia, ...
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