The quantum of plasma oscillation, arising from the quantisation of plasma oscillations
Questions tagged [plasmon]
79 questions
7
votes
2 answers
What are hot electrons?
What are they? How are they created?
And what do they have to do with plasmons?
I searched the web, but I would like more reliable and straightforward sources.
user46147
- 3,114
6
votes
1 answer
What is plasmon really? Is it a charge density wave of electron gas or an EM wave that exists across the metal surface?
Sometimes plasmons are defined as collective plasma oscillations of the free electron gas in a metal. Therefore, plasmons must be a periodic modulation of electron charge density in the metal. But sometimes, plasmons are defined as electromagnetic…
Solidification
- 12,736
6
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1 answer
Understanding the Plasmon dispersion relation to first approximation
Plasmons are quantized oscillations of the charge density in solids, and are found in basically all conducting materials in nature.
For light in vacuum, the dispersion relation is required for propagation at $c$, and you have $\omega=ck$ as a strict…
KF Gauss
- 8,314
5
votes
2 answers
What is the meaning of the zero point of the real part of the dielectric function for a semiconductor?
I basically understand the zero point of the real part of the dielectric function for a metal. It generally corresponds to plasmon. For a metal, if the frequency is lower, the real part is negative meaning that the light is completely reflected.…
John Cao
- 51
4
votes
1 answer
Obtaining equations of motion for a three-level atom and plasmon system
I am interested in a scenario where a three level atom (cascade/ladder type) is interacting with a spherical metal nanoparticle (MNP) with single plasmonic excitations. Let us assume that the ground, first excited and second excited states of the…
Toshi_H
- 131
4
votes
1 answer
Why are agglomerated gold nanoparticles black?
I put a drop of aqueous red colloidal gold on a glass. After the drop dried I saw that remaining nanoparticles were black instead of red. Why black? Does it mean that plasmon resonance is so strong and extends over all optical wavelengths? Is the…
user46147
- 3,114
4
votes
2 answers
Momentum change of a photon upon diffraction at a grating
How is the momentum change of a photon is related to the grating periodicity and diffraction order? I came across with this question while studying surface plasmon polaritons (SPPs) and how to excite them. According to a book(Plasmonics by Maier) on…
Vesnog
- 347
3
votes
3 answers
Exciting Surface Plasmon-Polaritons with Grating Coupling
I'm very new the topic of SPPs and have been trying to understand this particular method of exciting surface plasmons using a 1D periodic grating of grooves, with distance $a$ between each groove. If the light incident on the grating is at an angle…
Atreyu
- 301
3
votes
1 answer
How to find plasmon from Landau-Silin equation?
In David Pine's Theory Of Quantum Liquids: Normal Fermi Liquids, it's said that we can find charged Fermi liquid has plasmon modes easily from Eq. (3.40), replicated as follows:
$$
(\boldsymbol{q} \cdot \boldsymbol{v}_p - \omega) \delta…
jywu
- 389
- 1
- 8
3
votes
1 answer
Why do thermal hotspots in a metallic nanoparticle do not match it's optical hotspots?
I am a little bit confused here. When a metallic nanoparticle is impinged with light at its resonance, the electric field is greatly enhanced at the surface along the polarisation of the wave(suppose its enhanced East-west). But the heat that is…
mollie
- 31
3
votes
1 answer
Can someone please explain extraordinary optical transmission (EOT)?
Can someone please explain extraordinary optical transmission (EOT)?
I'm hoping someone can describe the physical process by which light is transmitted through a periodic metal hole array which is optically thick (i.e. thickness > skin depth), for…
Sean
- 55
- 8
3
votes
2 answers
Au, Ag nanoparticles plasmon peak position?
Is the interaction between metallic nanoparticles (~ 20 nm) and light in the UV-Vis-NIR range governed by Mie theory or by Rayleigh scattering theory?
Where are the Au and Ag plasmonic peaks located? Does the formula depends to $\lambda/d$ ?
aayyachi
- 540
2
votes
0 answers
What is the difference between the two energy dispersion relations for magnetoplasmon?
Recently I am investigating the energy dispersions of magnetoplasmon and I found two "different" energy dispersions in two references [1,2]. I would like to know the difference between them and also whether I understand them correctly.
According to…
Jing Huang
- 21
2
votes
1 answer
Plasmon Based Transistor vs conventional one
Conventional wires become very lossy at high frequencies.
Is this because of the skin effect?
Plasmon based computer chips, since plasmons can support much higher frequencies (~100 THz range).
Aren't free electron oscillations in a metal plasmons.…
mcodesmart
- 3,219
2
votes
1 answer
Laser on metal surface: What happens in terms of photons, plasmons, phonons and their interactions?
I'm trying to better understand what exactly happens when a laser beam hits a surface (apart from reflection). Say I have a thick gold surface (could be coated with gold nanoparticles if that helps) and I point a 50 mW CW red laser onto that…
MrFu
- 255