1,054 reputation
311
bio website
location
age
visits member for 2 years, 8 months
seen Aug 19 at 19:02

Come see me on physicsoverflow, I'm not very active here anymore...


Aug
17
comment electric field of unpolarized light after reflect?
Since you talk about single photons here, and all polarization, including partial polarization, is the result of time (or ensemble) averaging some coherent field, what is the phase of a single photon? Does the phase of a single photon even make sense?
Aug
17
comment Quantum theory of light
anna v, that wikipedia article doesn't add any insight into the "building up the wave" part, nor that there is a correspondence or the derivation of that correspondence. Just because the math is similar doesn't mean it is the same thing...the "spin angular momentum" of circularly polarized light can be derived and even experimentally measured completely within a classical framework...it is true that descriptions of polarized light, which are basically projection operators onto analyzer states, are similar to QM things, but I would like a good peer reviewed reference or Arxiv link...
Aug
16
comment Quantum theory of light
Do you have any references for the rigorous correspondence, I work on the classical side and haven't seen it derived how the transverse wave coherence properties and individual photon polarization correspond, what happens to the phase uncertainty as the number of photons goes to 1? (I'm not talking about Fock states here building up a wave, but going from Jones matrices/Stokes vectors to polarization of single photons), I ask because classical polarization is relationship of phase. Also, the blog linked had so many ads it locked up my browser...
Jan
30
revised Why doesn't my pinhole camera work?
spelling
Dec
12
awarded  Yearling
Sep
24
awarded  Autobiographer
Aug
12
comment Helicopter blades
Aliasing.......
Aug
12
comment What is “field size” when referring to perspective?
You are mostly correct, however the last paragraph needs to be more clear I think. The magnification ratio between the closer points and further points changes as the effective focal length of the lens changes...
Aug
12
comment Help calculating field of view for ball lens I just bought
I didn't do the calculations so I don't know the answer, but if the sensor is at the effective focus of the ball lens, you can't even define an object space FOV, you really only can give an object space NA. Are you imaging something a finite distance away (not objects at $\infty$)?
Aug
12
comment Optical absorption in multilayer structure
Is your incidence angle zero (i.e. perpendicular to the layer)? Also, I've seen people use the Fresnel reflectance equations incorrectly in situations like these, you will always get the right answer by using the amplitude equations...
Aug
12
comment Which of these theories on why light slows in media are true?
For #4, also think about conservation of momentum with a little bit of #2 mixed in...it isn't a billiard ball interaction, but the mass-spring formalism predicts all of it quite well, so well in fact it is what we use in graduate level optics (with a QM "correction constant"). Look up the Lorentz oscillator model...
Aug
11
revised Modeling the free space propagation of laser beams using Fourier transforms
added 10 characters in body
Aug
11
revised Modeling the free space propagation of laser beams using Fourier transforms
added 90 characters in body
Aug
11
revised Modeling the free space propagation of laser beams using Fourier transforms
added 335 characters in body
Aug
11
comment Modeling the free space propagation of laser beams using Fourier transforms
Also, if you write code for Fresnel, it will work in the far-field (Fraunhoffer) zone. I'll edit the above for the scales which are valid for each approximation. I believe that the Fresnel approximation is more stable numerically because some of the high frequency components of the actual free space transfer function are not well approximated when they are discretized. The Fresnel fixes this through a mathematical approximation...I didn't investigate fully however...
Aug
11
revised Modeling the free space propagation of laser beams using Fourier transforms
added 7 characters in body
Aug
11
comment Modeling the free space propagation of laser beams using Fourier transforms
It is, but it looses accuracy in the very near field you could say...prior to 1 or 2 wavelengths from your initial field.
Aug
9
comment Quantum theory of light
He asked about the S-matrix in the quantum sense, not Jones or Mueller formalisms (which are purely classical).
Aug
9
comment Rational ratio of frequencies leads to isolating integral of motion
It likely has something to do with the relationship between being rational, and periodicity on a closed surface...I suspect that if it is rational, you can show that the curve is periodic on the surface (and if it is periodic it must intersect itself again at some point, forming a line...
Aug
9
comment Reconciling total internal reflection and the evanescent Wave
You can actually integrate the Poynting vector in the evanescent direction and you will get zero...