4
votes
What are hot electrons?
When a small metal particle is irradiated by light a portion of the absorbed energy is used to transfer electrons from the valence to the conduction band (interband transitions), the other part is ...
- 51
3
votes
Accepted
What is plasmon really? Is it a charge density wave of electron gas or an EM wave that exists across the metal surface?
A plasmon is both of these things! With the charge-density wave comes an associated EM wave across the metal surface (or vice-versa). These are two sides of the same coin of a plasmon. You can't have ...
- 15.2k
3
votes
Accepted
Boltzmann equation: how to estimate the relaxation time?
The scattering rates for different processes (impurities, phonon-phonon, etc.) are typically calculated using Fermi's golden rule and then summed up to get a total scattering rate. (Summing them ...
- 4,285
3
votes
Why does plasmon have higher energy than phonon?
Fundamentally the plasmon is at higher energy because electrons weigh much less that atoms. In fact phonons are simply plasmons of the atoms.
One can see this from the classical formula for the ...
- 8,129
3
votes
Corrections to plasmons theory. (History of Plasmons)
Some aspects of SPP theory have remained the same over the years (e.g. the basic dispersion relation of an SPP at the metal-dielectric interface). But from your linked paper, it seems that you may be ...
- 12.2k
3
votes
Are surface plasmons fermions or bosons?
I don't exactly agree with the previous answer. Specifically, plasmons are a quantum of free-electron oscillation (ie plasma), while polaritons are hybridizations of photons and excitons. Excitons ...
- 31
3
votes
Using flat or thin glass for Surface Plasmon Resonance
The triangular prism makes the experimental setup less sensitive to alignment of the beam, while still letting the beam strike the surface at a near-perpendicular angle, minimizing reflection. You ...
- 4,294
2
votes
How to find plasmon from Landau-Silin equation?
I would take a look at Ch. 6 of Piers Coleman's Introduction to Many-Body Physics; in particular Exercise 6.6 asks essentially the same thing. The calculation that gets you the dispersion relation is ...
- 117
2
votes
What do you mean by non-radiative surface plasmons?
Consider a single film, consisting of two dielectric materials of dielectric constants $\epsilon_1>\epsilon_2$ sandwiching a layer of gold, which we model using a Drude dielectric function,
$$
\...
- 8,873
2
votes
Why is the speed of light ignored in this formula?
You don't need the speed of light:
$$
k_x=\frac{\omega}{c}\sqrt{\frac{\epsilon_d \epsilon_m}{\epsilon_d+\epsilon_m}}=\frac{2\pi}{\lambda}\sqrt{\frac{\epsilon_d \epsilon_m}{\epsilon_d+\epsilon_m}},
$$
...
- 734
2
votes
Obtaining equations of motion for a three-level atom and plasmon system
Some general remarks:
The equations of motion for the expectation values $\langle \hat{a} \rangle$, $\langle \hat{\sigma}_{12} \rangle$, $\langle \hat{\sigma}_{23} \rangle$ only have closed form at ...
- 11.7k
2
votes
Accepted
Difference between Surface plasmon and Localised surface plasmon
In nanoparticles, like atoms, charge oscillations do not propagate in space (i.e. local). This means they have zero group velocity, or no dispersion ($\omega$ is independent of $k$). So instead of ...
- 8,129
2
votes
Accepted
Is there software or code that is used to simulate hot ion plasma?
The controlled-fusion community has been developing CFD simulation code for plasmas, for decades. This is an extraordinarily difficult task because each computational cell's pressure, temperature, ...
2
votes
Why do thermal hotspots in a metallic nanoparticle do not match it's optical hotspots?
I am not familiar with nanoparticle science by any means, but I did read through the paper and give an attempt at an answer.
To explain the spatial mismatch between optical hot-spot and heat source ...
- 1,256
1
vote
How to calculate plasma frequency?
Everything shown in the plot is in normalized units. That is, the frequency, $\omega$, is normalized to the plasma frequency, $\omega_{p}$, and the wave number, $k$, is normalized to the inertial ...
- 15.9k
1
vote
Accepted
How can I take the Fourier Transform in the derivation of the Lorentz model?
In addition to the solution given by hyportnex in the comments, you can also see how this relates to the Fourier transform by recalling one of its important properties.
Define the Fourier transform ...
- 3,877
1
vote
Scattered fields in surface plasmon excitation with grating
The scattered wave is not important. You are after the surface plasmon polariton (SPP) mode, which is the wave propagating along the metal-dielectric interface. Since you are using COMSOL, you can ...
1
vote
Accepted
Plasmon modes of cylinder metalic particle
For a cylinder (and for most geometries for that matter), there is no analytical solutions for the plasmonic resonances.
This is directly linked to the (in)ability to solve Laplace's equation in the ...
- 1,055
1
vote
Accepted
Exciting surface plasmon polaritons - what is the purpose of air gap in Otto configuration?
I believe that in the perfect configuration for SPP you want to have total internal reflection of the incident beam which gives you an evanescent wave with the right phase matching (if you tune the ...
- 8,129
1
vote
Bulk plasmon: why can't they be excited by natural light?
I disagree with the premise. Light from free space is perfectly capable of exciting and interacting with bulk plasmons.
(You might be confusing bulk plasmons with surface plasmons? The latter indeed ...
- 16.9k
1
vote
What are Floquet modes?
You might find it helpful to research Floquet's Theorem first: it tells you what behavior to expect in linear differential equations with co-efficients which are periodic functions of the independent ...
- 89.3k
1
vote
Au, Ag nanoparticles plasmon peak position?
Mie provided a strict solution of the scattering of a plane electromagnetic wave by a homogeneous sphere. It is valid for an arbitrary size of a particle. However, the calculations can be difficult in ...
- 51
Only top scored, non community-wiki answers of a minimum length are eligible