Polarization Definition and 666 Threads

Hi all! In Ruth Durrer's book "The Cosmic Microwave Background" there is this picture (Fig. 5.2 page 193) about the E and B mode of the CMB polarization: http://imageshack.us/photo/my-images/11/s7o6.png/ http://imageshack.us/photo/my-images/11/s7o6.png/ They represent the E and B...

I have a vertically linear polarized laser according to specs. "Polarization ratio 100:1; Vertical linear polarization". However, When I place a polarizer in front of the laser its maximum is at 132 deg. and minimum is at 42deg. Thats 90 degrees apart.. Placing two polariazer infront of...

Homework Statement A sphere of radius R carries a polarization of \vec{P} = k \vec{r}, where k is a constant and \vec{r} is the vector from the center. Find the bopund charges, and the field inside and outside the sphere Homework Equations - \nabla \cdot \vec{P} \sigma _b = \vec{P} \cdot...

I've been reading Griffith's "Introduction to Electrodynamics" and I've got to this part where it says: "When you are asked to compute the electric displacement, first look for symmetry. If the problem exhibits spherical, cylindrical, or plane symmetry, then you can get \vec{D}directly from...

Homework Statement A beam of unpolarized light is incident on a series of three polarizers as shown. The angle of the transmission axis of each polarizer is indicated by the dashed line, with q1 = 110, q2 =230, and q3 = 370 (all defined relative to vertical). What is the ratio of the...

Homework Statement In order to decrease the intensity of a beam of unpolarized light to 10% of its original intensity using two polarizers, what is the required value of θ, the angle between the transmission axes of the two polarizers? Homework Equations tanθB=n2/n1 The...

A single photon approaches a polarization filter. It's orientation is described by a probability amplitude wave function. It is not reflected or absorbed, but passes through the filter. Now it's orientation immediately after is definitely known. Question 1: is there no...

When a photon is produced when an atom raised to excited state return to ground state it's frequency can be calculated. but can we predict the direction and polarization of that photon.

Hi all, Imagine a double slit experiment where each slit contains a polarization filter with some angle relative to each other (\alpha). If the polarization filters are parallel the usual interference pattern will emerge, and when they are perpendicular no interference pattern will emerge. What...

Hello all, I've been reading up on both potential and current polarization for directional phase relays in, "Power System Relaying" by Stanley H. Horowitz and Arun G. Phadke and I am confused as to how the direction of the fault (i.e. into or out of the line) is obtained. In potential...

I'm studying wave interference and having trouble to understand some concepts. I would like to ask what would happen in the 2 situations below Image 1 Image 2 Both waves are identical, have the same frequency, amplitude and velocity. They are polarized on the direction shown (first...

I read that for a plane wave E, B and k are always perpendicular to each other but then in a TM mode I have electric field in the direction of propagation. This means this TM and TE modes I cannot have in free space? Can I have them in a laser? If I can have some E-field in the direction of...

Does the electric polarization density of a dielectric inside a capacitor have the same direction as the electrical field? Considering the electric dipole moment vector goes from the - charge to + charge?

So I know that a linearly polarized photon is in a state ψ = cos(θ)\left|x\right\rangle + sin(θ)\left|y\right\rangle What if θ depends on time maybe something like θ\equiv\frac{E_{0}t}{\hbar}? The polarization is linear at any time t, it rotates as time passes? Isn't that circular...

Homework Statement A beam of light is reflected off the surface of some unknown liquid, and the light is examined with a linear sheet polarizer. It is found that when the central axis of the polarizer (that is, perpendicular to the plane of the sheet) is tilted down from the vertical at an...

¿ Why the photons emitted by an electron are desintegrated in a photon, and then in an electron a positron? The positive charge stay near the electron doing that charge stay minus than its real value. But, ¿ why don´t matter the same with the mass??

I was reading in my QM book that neutrinos are "essentially left handedly polarized." (Townsend on Page 119) If neutrinos can be polarized, what is oscillating? Do other particles with mass exhibit polarization?

Homework Statement A circularly polarized light hit the boundary between 2 regions at 45 degree and is totally reflected. What is the polarization state of the reflected beam? Homework Equations The Attempt at a Solution Since both s and p component are totally reflected...

Homework Statement Three polarizing filters are stacked, with the polarizing axis of the second and third filters at 23.0° and 62.0°, respectively, to that of the first. If unpolarized light is incident on the stack, the light has intensity 75.0 W/cm^2 after it passes through the stack. If...

Hi, I am currently studying quantum field theory with worldwidely used text written by Peskin and Schroeder. On page 165 of that text it says, " the amplitude vanishes unless the final photon is right-handed." But I cannot figure out how it works. With ε = (0,1,i,0), I get same expression...

I think I understand this only up to a point. 1. Photon spin is quantized to be +1 or -1 and these represent left- and right-hand circular polarization. 2. A photon can have a superposition of 2 spin states in any proportion. 3. Having probability amplitude of 0.5 of spin 1 and 0.5 of spin -1...

hello all. If one uses polarization modulation of radio waves does this imply a broad frequency spectrum knowing the carrier frequency and amplitude remain the same only the direction of the electric field is being changed ?

I heard that light in a medium can have longitudinal polarization i.e the e field in the direction of propagation, but i saw in a qed course that light can have temporal or scalar polarization (the E0 component). What is that one and how can one obtain this kind of polarization experimentally ...

I'm a grad student and I got some recent results that I can't figure out. Thought I would post a question and see if I can get a quick answer. I'm taking pictures of polarized system. Using a normal linear polarized filter that has a slip ring, so I take a picture, rotate the slip ring a...

Question 1 Basically I have no idea how to calculate the z part of the equation since x and y are assumed to be propagating in the z direction.

Homework Statement A linearly-polarized electromagnetic wave with a frequency w and with an intensity of 1MW/cm2 is propagating in x-direction in a nonlinear crystal with a refractive index n=1.5. Assume that a second-order nonlinear optical susceptibility tensor for second-harmonic...

Polarization states "directly measured": What did this experiment do? I ran across, on phys.org, this fairly pop-sciencey RIT press release: http://www.rochester.edu/news/show.php?id=5692 It describes an experiment which sounds very interesting, but the way the experiment is described is...

This is polarization density. Can somebody explain to me why exactly this is so? My book just says that's how polarization is defined.. Can you guys give me an intuitive understanding of why? Only thing I know is that χ is related to κ, the dielectric constant, and κ is related to how well a...

A linearly polarized wave is one in which the vector sum of electic fields in two perpendicular directions is always directed along the same line. An elliptcal one is that in which the vector sweeps an ellipse, and it can somehow be converted into circular polarization. That is all I understand...

A circularly polarized electromagnetic wave can be thought of proper combinations of orthogonal linear polarized waves, and a linear polarized wave can be thought of proper combinations of left and right circularly polarized waves. It seems one type of wave is no more fundamental then the other...

Homework Statement Unpolarized light falls on an angle of 37.5 ° with a plan glass surface. The reflected light polarization is examined with a Polaroid. The ratio between maximum and minimum intensity from Polaroid when it is rotated around is 4.0. Which is the refractive of index glass...

Unpolarized light falls on an angle of 37.5 ° with a plan glass surface. The reflected light polarization is examined with a Polaroid. The ratio between maximum and minimum intensity from Polaroid when it is rotated around is 4.0. Which is the refractive of index glass? I would like to use the...

What is the theory behind mapping of the latitude and longitude of the sphere in the Poincare Circle to the polarization of the TEM wave? That is, why: 1) Linear polarization when ε=0 deg? 2) Circular polarization when ε=+/- 45 deg? 3) Elliptical when ε is not 0 or +/- 45 deg? 4) RH rotation...

At the beginning of cpt 9, Griffiths states that massive bosons have three polarization states (m_s = 1, 0, -1), but massless ones have only two (m_s = 1, -1). Are these polarization states the same thing as helicity states? I.e. the W/Z would have 3 helicity states and the photon only 2?

Homework Statement Atomic losses can be described in the Lorentz model by adding into the equation of motion a damping term proportional to velocity. The equation of motion is then \partial ^2x(t) / \partial t^2 + \gamma \partial x(t) / \partial t + \omega_o^2 x(t) = qE/m Consider the optical...

I take issue with the "Advanced Engineering Electromagnetics" 2nd edition by Balanis again. In Page 156, it claimed for AR=-ve, it is Right Hand rotation, AR=+ve is Left Hand rotation. For plane wave propagates in z direction and at z=0: A)Let Ey lag Ex by \frac{\pi}{2} \Rightarrow\;\vec...

I am using "Advanced Engineering Electromagnetics" 2nd edition by Balanis AND "Antenna Theory" 3rd edition also by Balanis. I found an inconsistency in how to characterize RHC (CW) and LHC ( CCW) elliptical polarization. 1) In Advanced EE Page 159, for \vec E(0,t)=Re[\hat x...

[Wasn't sure if each problem needed a separate post. Please feel free to edit if needed.] Also \~ and \^ are tilde and hat respectively. 1a. Homework Statement Use perturbation theory to derive the 3rd order nonlinear susceptibility \chi^{(3)}(3w;w,w,w) (problem gives potential energy, etc...

This vid was produced by Cal Tech. Pay attention to Dr. David Goodstein's explanation of the polarization of light near the end of the video. Does any of it make sense to you, or are Cal Tech Professors showing their fallible sides?

Attached is a scan of how Balanis define plane wave with circular polarization with Ey having a phase of +∏/2 respect to Ex component of the E field. I don't quite agree with the book. The second attachment is my derivation. The definition of CW or CCW is with respect to direction of...

Hi there, I wonder if anyone heard or read anything about glass where one can control its polarization electronically. Or such that you can switch polarization on and off. Tried to google but all it gives references to polarized glass. Maybe I am using wrong term for such thing? Thanks in...

I have been trying to understand polarization match in the text from Balanis. The first attachment is the text scanned from the text explaining the polarization of an antenna in RECEIVING mode. I try to understand what the book said and I came up with my interpretation in my writing and drawings...

This is not a home work, it is part of the textbook on elliptical polarization. Attached is a page in Kraus Antenna book, I cannot verify the equation on the last line. Here is my work E_y=E_2(\sin{\omega} t \cos \delta \;+\; \cos \omega {t} \sin \delta) , \sin\omega {t} =\frac {E_x}{E_1}\;,\...

Hello, I am tasked with plotting the polarization state of a laser (basically I've made a polarimeter), but I really have no idea where to go at this point. Below is a sample of the program I have written with some real data that I just took from a laser. I have the intensity profile as a...

I want to find out that what happens if we polarize a white light which has all of the wavelenghts of 400-700 (nm).Does it divide into colors?What happens to it?

The question is here: http://physics.stackexchange.com/questions/45341/representing-a-polarization-vector-for-light-as-a-manifold-of-two-state I'd appreciante any help

Dear friends i know that a wave is linearly polarized if its components have a phase difference of n*∏ and is circularly polarized if phase difference is n*∏/2. But what if phase difference is neither ∏ nor ∏/2? like for E= ax exp(-j(βy-∏/4)) + azexp(-j(βy-∏/2))... thanks in advance...

Hi all, I want to measure electric polarization hysteresis loop so i need the electric circuit to measure it. The circuit mostly contains a resistor and a capacitance, i need to what is the exact value of them ? Please tell me if there is a reference for that Thank you

dear all, I want to confirm whether there is spontaneous polarization in the piezo materials. I know the piezo materials need to be poled under high temperature and electric field before applications. So if there is spontaneous polarization, comes my following confusing. Given a piezo disk with...

If we take the perspective that free space is permeated with a sea of virtual particles, popping in and out of existence, it seems reasonable that such a sea would experience some amount of electric polarization in the presence of an electric field. That is to say, positively charged virtual...