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

learn more… | top users | synonyms

9
votes
2answers
1k views

How do color filters placed in front of a light source,change the color of light that passes through?

For instance, placing a blue transparent folder in front of a desk lamp, makes the light that shines through it appear blue. From what I understand some red car lights do not have red light sources, ...
0
votes
1answer
56 views

Does a Polarizing Beam Splitter Cause Wave Function Collapse?

For a single photon, its polarization can be a superposition of two orthogonal bases (e.g. horizontal or vertical). However, as I understand, once it has been measured, it must collapse into one of ...
1
vote
0answers
20 views

Field due to bound charges in matter [closed]

What is the field due to a long cylinder that carries uniform polarization perpendicular to the axis? I am not able to get the answer using the expressions for the surface bound charge density and ...
0
votes
0answers
28 views

Measured Polarization for a Single Photon

I understand that for a given beam of light, it can exist in any number of polarizations. However, I have been told that given a single photon, it can only exist as horizontally or vertically ...
1
vote
1answer
17 views

Ionic polarisation: wave-vector of photon ~ 0

While discussing ionic polarization due to electromagnetic waves we discuss interaction of photons and ions of crystal. Now, the next step is to take conservation of momentum under consideration. ...
1
vote
2answers
46 views

Measuring polarization - problem with understanding

Let's assume that we have 2 polarizing filters. First with vertical (1) orientation and second with horizontal (0). I want to measure probability that photon passes through those 2 filters. I have: $...
1
vote
1answer
39 views

π , σ - atomic transitions with respect to a quantization axis

In the absence of a magnetic field, how does one physically (i.e perhaps in a thought expt) access delta_m = 0 or +-1 transitions since (as I understand it) the choice of quantization axis is ...
2
votes
1answer
27 views

Mueller matrix and Lorentz group

I have just learned about Stokes vectors and Mueller matrices for description of polarized light. In the text I studied there is clear restriction for the Stokes vector $\vec S$ that $S^2_0=S^2_1+S^...
1
vote
0answers
16 views

Why do everyday plastic items interfere with light polarizers?

I recently bought a few pieces of linearly polarized film (the one intended for smartphone LCD screens). At first I was confused because I could not make the polarizers work as they should - no matter,...
0
votes
0answers
18 views

Helicity of photon as a symmetry group

I have troubles understanding how to derive E(2) representation of a photon symmetry group from the fundamental principles of Eelectrodynamics. I know that it has to do with the symmetries of ...
42
votes
8answers
5k views

Why is the $S_{z} =0$ state forbidden for photons?

If photons are spin-1 bosons, then doesn't quantum mechanics imply that the allowed values for the z-component of spin (in units of $\hbar$) are -1, 0, and 1? Why then in practice do we only use the $...
-3
votes
1answer
737 views

Problem on Malus law? Doesn't work on certain angles [closed]

If unpolarized light falls on two polarizing sheets placed one on top of other, what must be the angle between the characteristics directions of the sheet a) if the intensity of the transmitted ...
0
votes
1answer
108 views

Amplitude of eliptically polarised light

In elliptically polarized light, can one define something called amplitude of Electric field? If yes, how do we determine it?
0
votes
1answer
30 views

Intrinsic permutation in nonlinear susceptibilities and pulses

The nonlinear susceptibilities have an intrinsic permutation symmetry. This symmetry treats two frequency components that are equal differently than it treats two frequency components that are ...
0
votes
0answers
44 views

Why does the polarization vector P depend on the net electric field and not the original one?

P= χε0E, where E is the net electric field from the effects of both free and bound charges. But E=(σfree-P)/ε0 So E itself depends on P. My concern is, isn't this circular? ...
7
votes
3answers
2k views

Is it possible to have a photon with -1 spin?

Wikipedia states that a photon has a spin of value 1. What I want to know is this: are there two possible spins for photons, i.e. +1 and -1 (like electrons, which can have +1/2 or -1/2)? If the spin ...
3
votes
1answer
34 views

Can circular polarized light be cancelled?

I can cancel the light output from an LED screen by placing a linear polarizer at 90 degrees from the linear polarizer built into the LED display. OLED displays use circular polarizers instead of ...
1
vote
2answers
86 views

Why the reflection of randomly-polarized light is not random? [closed]

"Reflected light is polarized". The following photo demonstrates this: (source) When unpolarized light is incident at this angle, the light that is reflected from the surface is therefore ...
4
votes
2answers
508 views

double slit experiment with two opposite quarter waveplates

Consider the usual double slit experiment involving laser and a double slit and a screen. Now place in front of the left slit a quarter waveplate (let's call it QWP1) that changes a certain linear ...
0
votes
0answers
36 views

definition of left and right circular polarization?

Which is the left and right circular polarization ? page 1 Wiki says this is right circular polarization ...
1
vote
1answer
170 views

Is putting a charged balloon up to a neutral wall polarization AND temporary induction, or just polarization?

Is putting a balloon that is charged up against a wall and having it stick polarization AND charging by temporary induction, or just polarization?
5
votes
3answers
225 views

What is fundamentally happening that causes light to change its orientation when repeatedly polarized?

When light is passed through two polarizers successively, its intensity and orientation afterwards depends on the angle between the polarizers and the orientation of the most recent polarizer, ...
1
vote
1answer
33 views

How to better view LCD through polarized glasses

When I put on my polarized sunglasses and look at my LCD monitor, I found the best viewing angle to be at $45^\text{o}$ to the left. Obviously the ergonomics of tilting my head to view my screen ...
2
votes
2answers
54 views

Does a circularly polarized electromagnetic wave transfer angular momentum from the transmitter to a receiving antennae?

This question is about the rotation of macroscopic objects and looks at the magnetic vector of an electromagnetic wave. As basis for comparison, we consider an induction motor. The stator induces a ...
7
votes
2answers
200 views

what happens inside linear polarizer sheet (at microscopic level) when unpolarized light falls on it?

(1) What happens at microscopic level when unpolarized light falls on a linear polarizer sheet ? i.e. Due to what thing inside polarizer sheet, only those EM waves are passed whose plane of vibration ...
0
votes
1answer
29 views

selection rules and polarization in magneto-optical traps

I have got a question concerning selection rules and polarization. In a magneto-optical trap, lasers & a magnetic field are used to trap atoms. In order to be capable of using the lasers as a trap,...
3
votes
1answer
57 views

Is it possible to create a pair of polarized, polarization-entangled photons?

Is there a light source which emits (mostly) polarization-entangled pairs of photons that have a known polarization angle, e.g. a certain angle in relation to the orientation of the source? Applying ...
9
votes
4answers
4k views

Three polarizers, 45° apart

If light is passed through two polarizing filters before arriving at a target, and both of the filters are oriented at 90° to each other, then no light will be received at the target. If a third ...
0
votes
1answer
614 views

Formula for Rabi frequency

The Rabi frequency is an expression of the light-matter interaction (Hamiltonian) and gives a relation between field polarization and electric dipole. Reading the book of Cohen-Tannoudji (Complement $...
0
votes
2answers
39 views

Derivation of Specific Rotation formula?

This is sort of a weird question, so bear with me: I was reading about how chiral molecules rotate plane polarized light and decided to think of a "logical" formula for expressing the amount that ...
5
votes
5answers
116 views

How comes unpolarized light do not undergo destructive interference?

As far as I know, unpolarized light is defined as light which as no clear axis of polarization, but electric field vectors in all directions. However, I also know that electric fields can be ...
1
vote
1answer
32 views

What is the relation between polarization and wave front?

I'm reading about the angular momentum of light, in which wave fronts are like helix. When I checked for a circular polarization on the web, shapes look very similar to these helical structures, So I'...
14
votes
2answers
1k views

Photons with half integer angular momentum - what's happening?

I have just read this article - what is happening? Analysing these beams within the theory of quantum mechanics they predicted that the angular momentum of the photon would be half-integer, and ...
0
votes
1answer
26 views

Active light polarization filter

I want to realise a (fast) active light polarization filter. I just need two states: 0° and 90° rotation of the filtering plane. Is it possible to use a "normal" LC film like in displays and just put ...
0
votes
2answers
202 views

Polarisation definition

What is more correct and what is the difference? Polarised waves are waves with vibrations in one direction perpendicular to energy propagation "vibrations in one plane" "vibrations in one direction ...
8
votes
3answers
545 views

Polarization of the lowest mode of a Gaussian beam

Most introductory analyses of Gaussian beam optics work within Helmholtz scalar optics, and therefore they ignore the beam's polarisation. Because of that, I'm not clear on what are the possible ...
0
votes
0answers
9 views

What is the estimator that used to de-rotation of CMB polarization? [duplicate]

For de-rotation of CMB polarization we need to use of estimator for rotation angle. and used many estimator for this process.
5
votes
1answer
11k views

Intensity of unpolarized light through polarizer

When unpolarized light is polarized with two polarizers, the intensity becomes $I=I_ocos^2(θ)$ (Malus's law). But when unpolarized light is polarized with only one polarizer, the intensity is reduced ...
0
votes
1answer
16 views

What happens if polarized light passes through calcite or some other birefringent material?

every explanation of birefringence I find talks about unpolarized light entering Calcite, but what if I use a polarized light? Will that mean that as I rotate the crystal the light will disappear then ...
2
votes
1answer
66 views

Do gravitational waves radiate isotropically?

Do gravitational waves radiate equally in all directions? If so, is this an inherent property of all gravitational waves or is it just due to how they are normally produced? In other words, in a ...
3
votes
2answers
77 views

Polarisation by Reflection - oscillation direction

I'm currently studying polarisation by reflection, and have come across two pieces of information from the same source, which I can't seem to understand on how they differ. The oscillation direction ...
1
vote
1answer
54 views

Unpolarized wave, $\Delta\varphi =\Delta \varphi(t)$?

I have seen a unpolarized wave defined in a number of places (e.g. here) as a wave such that: \begin{align} E_x&=E_0 \cos(kz-\omega t) \\ E_y&=E_0 \cos(kz-\omega t+\varphi) \end{align} Where $\...
-1
votes
1answer
55 views

Integrating by parts [closed]

I am having little trouble with my professor's note. $$F=-\int{(dr)}{(\vec{\nabla} \cdot \vec{P}) \vec{E} }=\int{(dr)}{(\vec{P} \cdot \vec{\nabla} ) \vec{E} }$$ where F is force, P is polarization, ...
0
votes
0answers
12 views

Why long range ordering and higher order rotational symmetry leads to dense K-space ?

In case of Quasicrystals Why long range ordering and higher-order rotational symmetry leads to dense K-space ? And high rotational symmetry include modification in discrete spectral feature to ...
0
votes
0answers
8 views

Having trouble with linearly varying potential values (semiconductor band modeling)

One way to model an electric field-induced potential along a 1D semiconductor is: $$\phi(z) = eE_\mathrm{field}z\quad [\mathrm{eV}]$$ I'm troubled with the values, however. A typical electric ...
0
votes
2answers
49 views

Proportion of photons passing through three polarizers

I've started recently reading book "Quantum Computing, A Gentle Introduction". After each chapter there are exercises for self study. For some of them there are answers, for some not. So far I've been ...
0
votes
2answers
43 views

Polarized light from any suface?

From a textbook I read something like this: "When sunlight is reflected from a horizontal surface, the plane of incidence is vertical, and the reflected light contains a preponderance of light that is ...
0
votes
0answers
15 views

Is it correct that the polarized scatter of a polarized light source is max. orthogonal to the light source?

First of all, is the statement above correct? And if so, is there a constant gradient, with no polarized scatter parallel to the polarized source up to fully polarized at 90 degrees?
0
votes
1answer
50 views

What happens when two polarized lights of the same wavelength interfere at 90 degrees with each other?

am I right in assuming that if I cross two polarized lights of the same wavelength the result would be destructive interference? I don't mean 90 degrees as in 'orthogonal polarization', but the two ...