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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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Jones representation of Unpolarized light

What is the Jones matrix representation of completely unpolarized light? Context : Majority of astrophysical sources' emission is totally unpolarized or partially polarized. I need to know the ...
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What's the difference between twisted light and light of circular polarization?

Circular polarization: https://en.wikipedia.org/wiki/Circular_polarization Orbital angular momentum of light: https://en.wikipedia.org/wiki/Orbital_angular_momentum_of_light From point of view, ...
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What is the polarization loss between RHCP transmitter, aircraft reflection, and reception by vertically polarized antenna?

A stationary transmitter transmits RHCP radio waves. These are reflected by aircraft as LHCP. A stationary receiver receives them using a vertically polarised Yagi-Uda antenna. Is the polarization ...
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Another Quantum Eraser Question

What is mysterious about the so called quantum eraser? A typical double slit experiment produces an interference pattern on the screen. In a double slit quantum eraser experiment there are ...
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Is there a way to make an “unseeable monitor” without modifying a computer's hardware? [on hold]

What happens if you remove the polarization filter from a computer monitor? shows how to make an "unseeable" monitor from a LCD monitor, i.e. one that requires special glasses to view. I was wondering ...
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Orientation of the linearly polarized light comming from circularly polarized light that went through a quarter waveplate

If circularly polarized (CP) light enters a quarter waveplate (QWP), it is converted to linearly polarized (LP) light. But what is the orientation of the resulting LP light? Does it depend on the ...
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Double silt experiment with one circular polarizer in front of only one slit in the which-way perspective?

If one puts in front of a double slit two quarter-wave circular polarizers (QWP) in front of each slit, say one with 45° and the other with -45° orientation (fast and slow axis - i.e. clock- and anti-...
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unusual questions regarding controlling polarized light with LCD shutters

1) Is it correct to assume that if a light is already polarized one of the polarizers on the LCD shutter itself is not required to be present to selectively block it? 2) Is it correct to assume that ...
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QCD gluon physical polarisation sum in the three gluon vertex

In the Compton scattering quark($p_1$) + gluon ($q_1$)-> quark($p_2$) + gluon($q_2$), there is three gluon vertex contribution. If we choose the physical polarisation sum $\sum_{\lambda} \epsilon^a(\...
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Does polarized light reflect in the same polarization?

If vertically polarized light hits a linear polarizer aligned at a 45 degree angle from the polarization of the light, my understanding is 50% of the light will pass through and have its polarization ...
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Why do mirrors not follow brewster's angle?

Normally a material will have an angle where the reflected light is completely polarized. Now say we have a mirror (implemented by a conductive silver coating) that reflects most of it's incident ...
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Spectrum of Dielectric Function along Energy

What do the peaks and troughs in the spectrum of the dielectric function (real and imaginary parts) along energy indicate? I understand that the real part represents the polarization and the imaginary ...
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Dielectric polarization - should not the dimensions of the polarised dielectric increase in the direction of the field?

In the classical model for polarization, if a dielectric is placed in a an electrical field (assumed to be static for the sake of simplicity), the trajectory of the electrons inside the atoms of the ...
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Electric Field & Polarization

Does everytime the electric-field $E$ & the electric displacement vector $D$ are parallel for every material?
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Is the direction of the electric field relative to the magnetic field in an electromagnetic wave a convention?

In an electromagnetic wave. Could the magnetic field be mirrored around the xy-plane? Is there a specific reason that the 2 fields are oriented this way? Is it just a convention?
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Propagators for polarised photons

Photons can be thought to come in two types. Depending on which way they are spinning. The propagator for a photon (sum of both helices) in a certain gauge is $\frac{\eta^{\mu\nu}}{|k|^2}$. I read ...
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Does the inverse-square law apply to linearly polarized light?

It's a stupid question but: We did and experiment using linearly polarized microwave radiation generators and receivers. Our teacher asked to check experimentally if the receiver measurements are ...
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Does the external leg contraction of gluon in QCD carry group generator index?

While I am trying to compute the amplitude for the following Feynman diagram I realized that the external leg contraction of $g$ should carry group generator index $A$ or $B$, is that right? If so, ...
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Unpolarized light, spherical wavelets and Photons

Before I get to the core of my question, I would like clarify my understanding of unpolarized light. Below are 2 images of unpolarized light from Google: The first one seems to be in accordance with ...
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Is there an Heisenberg uncertainty relation for light polarisation?

While reading some questions about the polarisation of a photon, I was wondering about its quantum mechanical representation as a classical vector in the electromagnetic field operator : \begin{...
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Deriving the electric displacement field ($D$ field)

I am trying to derive the $D$ field (or electric displacement field): $$D=\varepsilon _{0}E+P$$ I am using the following relationships: $$\rho=\rho_{f} + \rho_{b}$$ $$ \rho_{b} =-\nabla \cdot P$$ ...
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Does polarization happen with single Photon?

I have read that circularly polarized light forms from the superposition of two linearly polarised light. Then is it true that polarisation can't happen with single Photon because it always need at ...
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The potential difference when neutral dielectric ($\varepsilon_r$) flows with speed $v$ through capacitor in magnetic field $B$

The distance between the two parallel plates of the initally discharged capacitor is $d$. Parallel to the plates there is a magnetic field $B$, as the image shows: So we want to know the potential ...
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Why do nearby charges increase the probability of virtual particles?

I'm a layperson currently reading through Matt Strassler and on his website, he states, in relation to using positronium as an example of vacuum fluctuation effects: The stronger force between the ...
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Can polarised light become unpolarised light as it travels through space?

Is the polarization of a light beam permanent? I mean, does the polarization change as it travels through vacuum? If so, what causes it to change?
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Circularly Polarized Light Through a Linear Polarizer

When a circularly polarized light is incident on a linear polarizer, shouldn't the transmission of said light be dependent on the momentary orientation of the polarization at the instance of incident? ...
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Why is the electric field phase shifted in this circular plane wave?

The $x$-component of a circular polarized plane wave is $$ E_x(\vec r,t)=E_0\cos\left(\frac{w}{c}(0.6y-0.8z)-wt\right) $$ With only this given, we can devise the total electric field as $$ \vec E(\...
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Unpolarized light - Why don't light sources then look invisible? [duplicate]

Pardon me if this has been asked before. I was just thinking about how light from a source like the sun is unpolarized. I have two questions: Is unpolarized light from the sun 100% random? Meaning ...
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Polarization vector for linear dielectrics

I'm confused about the relations between electric field vector $\bar{E}$, polarization vector $\bar{P}$ and induction vector $\bar{D}$. In a parallel plate capacitor filled with a dielectric I find ...
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Perpendicular polarizer filters for solar power conversion?

If two perpendicular polarizer filters are placed on top of each other, they would almost all of the (visible and UV) light that falls on them. This could be used to absorb sunlight, which would heat ...
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Changing transmittivity of polarizing filters for different wavelengths

I suppose, that a polarizing filter works as described here: The polarizing filter absorbs or reflects some of the photons in the light beam, which is why the energy/power measured after the ...
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Calculating the expectation value of a spin operator in a uniform magnetic field

I'm trying Usually for these types of questions, I'm used to the field being in a specific direction. For example, if the field was in the z direction, I could find this solution by checking |< ...
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Difference between unpolarized beam and half H+V polarized beam

Let's say that we have got two light beams. Beam A is not polarized at all. Beam B is composed of half H polarized photons + half V polarized photons. Is there any way to measure those two beams in ...
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Operator to find position of a particle in many body system

I am reading the following article by Raffaele Resta about modern theory of polarization The quantum-mechanical position operator and the polarization problem My question is not about polarization....
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Total bound charge in dielectrics [closed]

We know that the total bound charge in a dielectric is zero. The surface and volume bound charges in a dielectric due to polarization vector $\mathbf{P}$ is given by $\mathbf{P} \cdot \mathbf{\hat{n}}$...
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What am I getting wrong about polarizing filters & quantum mechanics?

I saw a video where they used polarizing filters. At first they took two and put them so that one is perpendicular to the other. They shone light through them and nothing passed. They then inserted a ...
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Polarization of Electromagnetic waves

Why we use the direction of electric field to specify the polarization of an electromagnetic wave?
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Unpolarized Light: is it always linear or could it be elliptical?

Unpolarized light is essentially polarized light in every direction i.e. there are so many waves radiating, that each wave oscillates in a different direction. Polarized light can either be linear or ...
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A Question About Brewster's Law

In most textbooks I read, they state that when the angle of reflection + angle of refraction = 90, there is maximum polarization. What I don't understand is what maximum polarization means. Does it ...
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What is the unit of polarization mode dispersion?

I calculated the differential group delay (DGD) from measured data following a chapter in the book "Polarization Optics in Telecommunication" by Jay Damask. Basically, I measured a unitary matrix $U(...
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Constructing Gravitational waves with gravitons

Suppose I want to construct a gravitational wave as a coherent sum of many gravitons. It's easy to think of what the frequency distribution of the gravitons should be, as all the LIGO discoveries more ...
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What is the difference between horizontally/vertically polarized light and s/p polarized light?

My doubt comes from a discussion we had in class about the Brewster angle, glare effect produced by the reflection of sunlight on water and polarizing sunglasses. So an unpolarized electromagnetic ...
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Does the polarization of white light affect its dispersion?

The only way to change the oscillation of light waves is through polarization and to the best of my knowledge there are 3 types namely: Linear Polarization Circular Polarization Elliptical ...
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Bound Surface Charge Density and Polarisation

Here's what I read in Introduction to Electrodynamics by D.J.Griffiths: Given the polarisation vector $\vec P$ and the unit vector normal to the surface $\vec n$, we can find the surface bound charge ...
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Electrostatics: Charge Distribution and Energy - Confusion

Consider the following situation: Between two metallic plates, are two dielectrics of dielectric constants $K$1 and $K$2. The surface charge density on the upper metallic plate is $\sigma$, and that ...
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Problem in derivation of nonlinear optics wave equation

Consider Maxwell's equations in a general medium without free charges or currents: $$\nabla\cdot\vec{D} = 0 \tag{1}$$ $$\nabla\cdot\vec{B} = 0 \tag{2}$$ $$\nabla\times\vec{E} = -\frac{\partial \vec{B}...
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Phase Changes during Reflecion

I want to ask that whether there is any phase change during reflection of a P-polarised wave? I know that for a S- Polarised wave there is a phase change of 180° when wave travels from rarer to denser ...
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What are these radial and azimuthal “$s$ and $p$ polarization” vectors for a free-space EM beam representation?

I'm reading the rather interesting recent paper Role of Radial Charges on the Angular Momentum of Electromagnetic Fields: Spin-3/2 Light. O. El Gawhary, T. Van Mechelen, and H. P. Urbach. Phys. ...
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Using Stokes parameters, how do I quantify the co-polarization and cross-polarization?

Given the Stokes Vector $$S_i = I_0\begin{pmatrix} 1 \\ 0.6 \\ -0.2 \\ 0.07 \end{pmatrix}$$ how do I quantify the polarization? Is there a way to say $S_i$ is $x$% right- or left-hand-circular, $y$%...
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Polarization of light using QM principles [duplicate]

If we have vertical linearly polarized light and if we put it through a polarizing filter oriented at 45 to the vertical, then only half of the light passes through. I am able to intuitively grasp ...