All Questions
Tagged with electromagnetic-radiation optical-materials
22
questions
6
votes
2
answers
581
views
Could a transparent frequency-altering material be possible?
I would imagine a material that is transparent but a electromagnetic wave going out will have a lower frequency than when going in (and maintaining it's direction). You could build glasses to see UV-...
- 63
1
vote
1
answer
39
views
Can an optical medium be lossless and dispersive?
Occasionally, I come across the phrase "lossless dispersive linear optical medium". How can such a medium be possible mathematically? I mean the real and imaginary parts of the electric ...
- 437
0
votes
0
answers
9
views
How are 3 Principle Sections possible in a crystal even when there is only one optical axis and all must contain it?
While studying polarization in calcite crystals, I came across that there are 3 possible principle sections in the rhombohedral crystal. But the conditions are that each section must be perpendicular ...
0
votes
0
answers
45
views
How can a greater than 1 reflectance coefficient be explained in $\rm SiC$-$\rm SiO_2$ interface?
I ran a simulation using the Transfer Matrix Method to plot the R,T and A curves for a SiC->SiO2 interface. There's a region of incident energies where the |r|^2 I get is higher than 1 and the ...
- 11
1
vote
1
answer
56
views
Why are things reflective, absorbent, transparent etc? [duplicate]
What determines whether a material reflects, absorbs or transmits a certain wavelength of light? Just a layman's question.
- 111
3
votes
1
answer
454
views
Brewster's angle for Metal?
As metal has a high refraction index, it is possible to have Brewster's Angle for Metal when the light incident from the air? Is it possible to derive from any formula?
- 41
5
votes
1
answer
174
views
Does the front of a light wave always propagate at $c$ in media
Consider light moving along one dimension at the classical level. I am interested in the situation where a wave front impacts a material with some generic index of refraction $n(\omega)$, and ...
2
votes
0
answers
60
views
How to figure out TM and TE modes based on dispersion relation?
According to this paper (https://doi.org/10.1063/1.5128679), the dispersion relation of hyperbolic materials is as follows:
then it is said, that he first term in brackets in the equation describes a ...
- 21
0
votes
1
answer
59
views
What formalism is used to model thin film optical coatings that function across a range of angles of incident light?
Thin film optical coatings [0] are atomically/molecularly thin layers of material applied to a substrate with the intent of affecting the optical properties of the substrate. For example, magnesium ...
- 21
3
votes
2
answers
280
views
What is the mechanism of transparency of EM?
What happens in transparent materials? Do their molecules oscillate with the same frequency as the EM wave and then reemit in the same direction? Or the light goes through meshes in the bulk?
- 651
1
vote
0
answers
415
views
Does reflection depend on wavelength?
I'm aware of processes like Rayleigh scattering, Compton scattering and pair production. But as these processes treat light as being particles(?) I'm not sure whether they are helpful to understand ...
- 1,507
2
votes
0
answers
88
views
What determines the penetration of electromagnetic waves?
What is it that determines whether or not an electromagnetic wave can penetrate different materials and how far it can go? For example light can penetrate through glass, but not concrete walls, but ...
user284476
0
votes
2
answers
196
views
Could we see through objects if our eye could detect other wavelengths of light?
We see objects around us because light reflects off the surface and enters our eye. So if our eyes could see a wider range of the spectrum (maybe lower wavelength as they would scatter less) then ...
0
votes
0
answers
180
views
How is water athermanous?
My textbook says that water is an athermanous substance i.e. the type of substance which does not transmit any incident heat radiations. But how is that true since water is transparent, light that is ...
- 13
0
votes
0
answers
37
views
How does light pass through any glass? [duplicate]
This might be a very stupid question for Science students, but I had this doubt always, since childhood. I still don't understand even when I'm adult because I didn't read science in detail.
When I ...
- 109