Linked Questions

11
votes
5answers
2k views

Plants and quantum mechanics!

I have been working on quantum biology and found something interesting that I would like to write an equation for. Scientists have wondered how plants have such a high efficiency in photosynthesis; ...
4
votes
5answers
2k views

Isn't all light polarised?

I apologize if my question does not make sense.(I'm teaching myself microscopy.) So reading Fundamentals of Light Microscopy and electronic imaging by Douglas&Murphy, at one point the author ...
6
votes
4answers
1k views

Is a photon always in a state of superposition while traveling through space?

In the double-slit experiment, we emit a photon that is in a state of superposition (wave form) which travels through both slits to interfere with itself. When we measure which slit it went through, ...
11
votes
5answers
2k views

Coherence length of a single photon

If I pass individual photons through a M-Z interferometer with equal arms I will observe interference (eg only one detector will respond). As I increase the path length of one arm I will observe the ...
9
votes
5answers
783 views

Is a single photon also a Maxwellian wave?

A photon is associated with the equations $h\nu$ and $\frac{hc}{\lambda}$. My book (Serway Modern Physics) says that Einstein explained the photoelectric effect by assuming that the classical ...
3
votes
3answers
2k views

What is the meaning of “ $\Psi$ is not a measurable quantity in itself”?

I want to know that why the wavefunction $\Psi$ as a complex quantity (i.e $A+iB$ form) in quantum mechanics and somewhere I have studied that $\Psi$ is not a measurable quantity in itself that's why ...
4
votes
1answer
2k views

electric field of unpolarized light after reflect?

Reflection and transmission (Fresnel equation) of polarized light are treated in many optics or electromagnetism books. If $E_s$ and $E_p$ is incident electric field with s-polarization and p-...
4
votes
2answers
929 views

How to interpret single photon interference when the two possible paths are different in length?

Here is my question. I struggle with the definition of single photon interference. Let’s assume we have a Michelson interferometer and the interference pattern we observe is a single photon result, ...
2
votes
3answers
579 views

Violation of conservation of energy?

Imagine a perfectly spherical mirror with 100% reflection. Imagine a point source of light in the center. The point source keeps radiating light. Will the light undergo destructive interference ...
3
votes
3answers
173 views

How do photons interact with a very fine edge?

Suppose you have some material which has a low reflectance and is opaque to an incomming photon when the angle of incidence is small. Now take that material and make a narrow (20:1 width:length ratio ...
3
votes
1answer
901 views

Evanescent waves and photon tunneling

Context I am reading about near-field heat transfer. Generally this phenomena is describes using (classical) Maxwell equations. In vacuum heat transfer from a body A to a body B such that $T_A > ...
8
votes
1answer
234 views

Relation between radio waves and photons generated by a classical current

Several questions have been posted on Physics SE regarding the relationship between photons and electromagnetic waves, and several good answers have been given. Some of those questions are listed ...
3
votes
1answer
552 views

Why grating is an essential part of a monochromator?

From looking at these two images, it appears that the dispersed "rays" of the reflected light could be manipulated just as well if the reflecting mirror would be turned to a fixed angle. So why is ...
8
votes
1answer
249 views

Does total internal reflection really reflect every single photon?

In certain cases of refraction, light can be totally internally reflected (TIR) instead of being transmitted. One learns that literally 100% of the light is reflected back in such an interaction. My ...
0
votes
1answer
461 views

How is light slowing down in a medium thought of in the photon picture? [duplicate]

The speed of light in any medium besides vacuum is smaller than $c$. In a classical way, I just look at that as a wave that propagates less fast, the change in EM-field is passed on slower. How should ...

15 30 50 per page