All Questions
Tagged with electromagnetic-radiation solid-state-physics
20
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dipole-radiation in semiclassical dynamics solid state
Using the semiclassical dynamics in solid state physics (electrons on a lattice with periodic potential, constrained to a band structure), we usually obtain that in the presence of external fields (...
- 51
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2
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104
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Speed of EM Waves
We know that for electromagnetic waves, according to Maxwell's Theory
$$v=\frac{1}{\sqrt{\mu\epsilon}}$$
Now consider an opaque object like say Gold. It has a particular value of permittivity and ...
2
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81
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How does photon reflection work quantum mechanically? [duplicate]
When a single photon strikes a mirror, it is reflected back such that the incident angle= the reflected angle. When the photon interacts with the surface lattice of the mirror, what exactly is ...
- 719
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283
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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?
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How do Fluorescent molecules emit light in a different wavelength than the one needed to excite them?
if it took a very certain amount of energy to excite an atom, how come when it de-excites it emits a photon of lower energy?
I know that's what scintillators do, I Just want to know the microscopic ...
- 411
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456
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Non-monochromatic (multi-wavelength?) lasers
I was recently doing some reading on lasers, and I came across the fact that truly monochromatic light is impossible, which then obviously implies that truly monochromatic lasers are impossible. But ...
- 43
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54
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Relevance of electromagnetic multipole transitions
In what kind of systems higher electromagnetic multipole transitions (like electric quadrupole transitions) become important or at least measurable?
Is it for antennas in radiofrequency? Is it in the ...
- 171
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44
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Is infrared active phonon the reason why infrared is not passing through walls?
I did some research on why infrared is not passing through walls.I learnt about infrared active phonons which are responsible for scattering in solids.It cannot be raman scattering,rayleigh scattering,...
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Are holes a fundamental particle? Are they a real thing or just a construct?
Some electronics textbooks seem to refer to holes as just a construct, while solid state physics textbooks seem to imply that holes are a very real thing. I understand that holes are vacancies (p-n ...
- 109
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147
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Why most physical objects in earth/universe doesn't allow visible light to go through?
Basically electromagnetic waves have many frequencies.Most objects block only certain narrow frequencies. Most objects in universe, and in earth, happen to block frequencies that correspond to visible ...
- 601
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668
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Free Electron Theory
If we consider a metal such that the lowest frequency electromagnetic radiation to which it is transparent is 2 x $10^{16}$ Hz. Now if the free electron density of the metal is doubled, what can be ...
- 2,015
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What is the relationship between the structure/composition of the medium and the speed of light in this medium? [closed]
We kwon that the speed of light (C=Co/n) depends on the properties of the medium in which it propagates (n, index of refraction).
As n is characteristics of the environment in which light propagates, ...
3
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257
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Can radiowaves penetrate the ground and find aluminium and be reflected to later be analyzed and tell us what lies under the ground of a planet?
Can radiotelescopes analyze these radiowaves to know what lies beyond some centimeters or even meters of planets subsurfaces?
- 187
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How do signals go through solid objects? [closed]
So many types of signals pass, or seem to pass I don't know, through solid objects. How do they do this?
- 2,878
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879
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Dispersion of light in metals and the plasma frequency
I've been reading about the dielectric function and plasma oscillations recently and I encountered the following dispersion relation for EM waves in metals or in plasma (Is it correct to treat those ...
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