Questions tagged [plasmon]
The quantum of plasma oscillation, arising from the quantisation of plasma oscillations
75
questions
0
votes
0
answers
14
views
Plasmon and The Orientation of the Plasma Oscillation
The electric field wave resulting from plasma oscillation can be broken down into the transverse and longitudinal components, whose frequencies are given by
$$\omega_{transversal} = \sqrt{c^2k^2+\...
- 57
0
votes
1
answer
51
views
TM and TE modes
I am facing TM and TE modes, while studying plasmons and surface plasmon polaritons (SPP), and as far as i have understood SSPs are TM modes (localized at an interface dielectric-metal). The problem ...
- 1
0
votes
0
answers
10
views
Is the temperature dependence for electron phonon scattering the same between plasma oscillations and DC transport?
I am examining the temperature dependence of electron phonon scattering in the case of a metal responding to an AC field (forming a plasma oscillation). I have found that for DC transport, the ...
- 123
2
votes
1
answer
32
views
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) ...
- 255
0
votes
0
answers
29
views
Confinement of electromagnetic field in coaxial cable
I wonder about the situation when we apply AC voltage or RF voltage on coaxial cable. Typically, the lateral dimension of coaxial cable is smaller than the wavelength of electromagnetic field in such ...
- 1
0
votes
0
answers
14
views
Local field enhancement and conservation of energy
When studying Localized Surface Plasmon Resonance (L-SPR) one analyzes the interaction of plane waves with spherical nanoparticles and gets the result that the field $\vec{E}_{in}$ induced inside the ...
1
vote
0
answers
10
views
Can plasmon nanoparticles be displaced by EM field’s?
As at specific frequencies of light, a plasmonic nanoparticle’s electron cloud will predominately shift to one part of the material, will this cause the material to shift in that direction?
- 467
2
votes
1
answer
65
views
What do you mean by non-radiative surface plasmons?
I would like to know if anyone can tell me what we meant by non-radiative Surface plasmons, when we look at the dispersion relations?
0
votes
1
answer
90
views
How do wave equations have an exponential solution involving wave vector and the propagation constant?
I hope you all are doing well!
I was trying to derive the propagation constant for the wave vector of the surface plasmons. I have uploaded the document below, which is the following:
Here , is the ...
0
votes
1
answer
74
views
Can someone help me in understanding what actually plasmons are?
This question might have been asked several times but I am confused on this topic. What actually are the plasmons? Do they only exist in the case of metals or they can be found even in semiconductors? ...
- 31
0
votes
1
answer
72
views
Using flat or thin glass for Surface Plasmon Resonance
SPR is typically created using prism with a thin gold film on the other end. I was wondering if I cut the triangular prism (using a glass cutter at home) into thinner slices, would this have an impact ...
- 101
0
votes
0
answers
45
views
What is the value for the plasmon frequency of intrinsic $\rm Si$?
I found some values for the plasma frequency $\omega_p$ of doped $\rm Si$, but not for intrinsic Si. Because of this, I tried to calculate it with
$$
\omega_p^2 = \frac{ne^2}{m_\text{eff}\ \epsilon_0\...
- 1
2
votes
0
answers
18
views
Golden quantum dots blinking and plasmons
I have been reading this article about golden QD as a way to avoid QD blinking. I understand that the surface plasmons here act as a nano antenna which strongly concentrates the light, but I don’t ...
- 21
0
votes
1
answer
87
views
Why is the speed of light ignored in this formula?
I'm trying to follow this worked example from my lecturer.
Here's the question:
and here's the answer to part 1:
When I was attempting this without looking at the answer, I did correctly identify ...
- 1
0
votes
1
answer
320
views
Boltzmann equation: how to estimate the relaxation time?
I am looking for qualitative/general explanations or references. A famous approximation of the full integro-differential Boltzmann equation is the so-called "relaxation time approximation", ...
- 3,772
1
vote
0
answers
42
views
Features of plasmon and surface plasmon polariton
What is the difference between surface plasmon polariton and plasmon in the Hamiltonian? So let's say that I can diagonalize the Hamiltonian of the system I am studying no matter how complicated that ...
- 161
0
votes
1
answer
50
views
Prism parameters influence on Surface Plasmon Resonance
I have been interested in researching a lot about surface plasmon resonance (SPR) and I was wondering exactly how the thickness and the size of the prism affects the results? I could not find an ...
- 101
1
vote
1
answer
67
views
Is there software or code that is used to simulate hot ion plasma?
How are hot plasma simulated like fluid particles in CFD?
Note: If this question is topic, i will eventually delete question but i only need an answer.
4
votes
1
answer
311
views
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 ...
- 10.4k
0
votes
0
answers
22
views
How can subwavelength grating provides mometum require to excite SPP?
Subwavelength grating shows no diffraction orders of course except 0th order, then how will it get required momentum to match with Surface plasmon excitation? is it any role of evanescent wave?
- 1
0
votes
1
answer
54
views
Why can electrons excite surface plasmons but not photons?
On optical energy loss function, it is said that we don't see the surface plasmon. However, we can see the plasmon peaks on reflection electron energy loss spectroscopy.
My question is that why ...
- 51
0
votes
0
answers
58
views
Are surface plasmons real eigenstates of the metal Hamiltonian?
I am studying surface plasmons on a nanosphere using classical electrodynamics but I was wondering if surface plasmons were or not eigenstates of the nanoparticle Hamiltonian. I think they are not ...
- 161
1
vote
0
answers
30
views
Plasma Mode in Type I Superconductors above and below $T_{c}$
Consider a type I superconductor above and below $T_{c}$. Do the longitudinal oscillations of the electromagnetic vector potential below $T_{c}$ correspond to the well-known plasmon mode for a normal ...
- 774
0
votes
2
answers
439
views
How to calculate plasma frequency?
i am wondering about Plasma frequency magnitude. According to the image i want to plot that graph.
user109707
0
votes
1
answer
130
views
How can I take the Fourier Transform in the derivation of the Lorentz model? [closed]
How would one take the Fourier Transform of
$$
m\frac{d^2x}{dt^2}+m\omega_0^2 x + m\Gamma \frac{dx}{dt} = -eE
$$
to get
$$
-m\omega^2 x+m\omega_0^2 x + jm\omega\Gamma x = -eE
$$
This is in our class ...
- 117
2
votes
1
answer
310
views
Scattered fields in surface plasmon excitation with grating
We need to use prism-coupling (e.g. Kretschmann or Otto configuration) or use grating to excite surface plasmon between metal and dielectric. What I understand is that when we use a grating or ...
- 223
2
votes
1
answer
752
views
Electric current dipole moment
Electrical Current Dipole of dipole moment $\mathbf{p_{EC}}$ has unit of $A\cdot m$. My knowledge of dipole moments unfortunately stopped in high school where I learned that dipole moment $\mathbf{p}$ ...
- 31
2
votes
1
answer
44
views
Plasmon modes of cylinder metalic particle
Solving Laplace equation gives plasmon modes of spherical metalic
particle radius $R$, plasma frequency $\omega_p$. Famous result is $l = 0, 1, 2, ...$
$$\omega_l = \sqrt{\frac{l}{2l+1}} \omega_p$$
...
- 307
0
votes
1
answer
33
views
What is the fundamental difference between a cavity and plasmonic cavity?
In the process of exploring plasmonic systems I have quite often come across the description of cavities as Plasmonic cavities. What is the exact difference between a normal cavity and a plasmonic ...
- 332
1
vote
1
answer
46
views
Depolarization factors of a drude metal plasmonic spheroid
A practice question asks for the depolarization factors $ L_{i=x,y,z} $ of a plasmonic spheroid made of a drude metal having the same resonance as the SPP resonance frequency.
The answer turns out to ...
- 63
1
vote
0
answers
72
views
Number of TM Modes in Waveguide in MIM waveguide
I'm working on a practice question requiring me to find the total number of TM modes (including normal modes and SPP excitation modes) in a symmetric Metal-Insulator-Metal (MIM) waveguide only knowing ...
- 63
1
vote
1
answer
60
views
Exciting surface plasmon polaritons - what is the purpose of air gap in Otto configuration?
I am currently reading about exciting surface plasmon polaritons (SPPs). One of the most common methods described in literature for exciting a SPP is using the Otto configuration (image from https://...
- 69
1
vote
1
answer
280
views
Power absorbed by electron in plane electromagnetic wave
How can the power (in Watts) absorbed by the electron be calculated, knowing the incident electric field amplitude $ E_0 $, wavelength $ \lambda $, and the electron momentum relaxation time $ \tau $ ...
- 63
0
votes
1
answer
80
views
How can there be an electric field normal to the surface in a surface plasmon in a metal
Ashcroft and Mermin's Solid State Physics, chapter one, has an exercise about surface plasmons. They give the electric field normal to the surface of the metal as $E_z=Be^{iqx}e^{-Kz}$ How can this be?...
- 161
3
votes
1
answer
92
views
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 ...
- 31
2
votes
0
answers
50
views
Why exciton-plasmon electromagnetic coupling is possible?
There is a number of works about exciton-plasmon hybrid excitations (polaritons) in nanostructures, for example:
https://aip.scitation.org/doi/abs/10.1063/1.4895061?journalCode=jap
https://www....
- 2,233
1
vote
3
answers
346
views
Why does plasmon have higher erngy than phonon?
In my mind plasmon is movement of electrons and phonon is movement of atoms in an lattice. movement of atoms should have a large energy because atom is larger.
- 129
2
votes
1
answer
71
views
Corrections to plasmons theory. (History of Plasmons)
Is it true that around 70's there was a huge change in theory that describes plasmons (SPP, to be precise)? Recently I stumbled upon an interesting (but old) paper about plasmons. Authors of that ...
- 2,874
5
votes
1
answer
463
views
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 ...
- 6,539
2
votes
1
answer
244
views
Difference between Surface plasmon and Localised surface plasmon
Here is what I understood from the plasmons:
Bulk plasmon: we need longitudinal electric wave to excite them. Then it is not possible to excite them with natural light.
Surface plasmon: we can't "...
- 1,253
1
vote
2
answers
1k
views
Bulk plasmon: why can't they be excited by natural light?
Here is what I have understood from bulk plasmons.
We can show using an hydrodynamic model that they are are coupled to a longitudinal electric wave in a medium.
Thus we need to create a ...
- 1,253
1
vote
0
answers
57
views
Purcell enhancement and transitional dipole moment of a quantum dot?
Let us consider a quantum emitter with a transitional dipole moment $\mathbf{p}$ and transitional frequency $\omega_0$ which is placed in an inhomogeneous environment. Its spontaneous decay rate is ...
- 253
4
votes
1
answer
406
views
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, ...
- 121
0
votes
1
answer
5k
views
What are Floquet modes?
When simulating a nanohole array for extraordinary optical transmission, I found that we have to use unit-cell boundary conditions. There is another concept to be understood which is Floquet modes. ...
- 39
1
vote
2
answers
101
views
Boundary conditions to be used in simulating plasmonics
I am very new to this field and trying to understand the boundary conditions usage when simulating plasmonic structures. I use CST studio suite for EM simulations.I am not understanding exactly what ...
- 39
1
vote
0
answers
163
views
Associating a dielectric function with a 2DEG
The electromagnetic properties of a two-dimensional electron gas (2DEG) are usually characterized by a surface conductivity dependent on surface charge density $N_s$ and scattering time $\tau$ as:
\...
2
votes
0
answers
248
views
How do I derive and use the effective hamiltonian for plasmon-exciton coupled system to obtain operator equations of motion?
Consider the interaction of a single surface plasmon mode in a metal nanoparticle with a dipole emitter(atom) under the classical driving field $ E_i = E_0e^{-i\omega t} + c.c $ , with the following ...
- 121
2
votes
0
answers
367
views
Deriving coupled equations of motion using optical master equation for atom-plasmon system
I am learning the interaction between surface plasmons (which are bosons that act much like photons) and atoms.
I came across the following scenario describing the interaction between a two level ...
- 121
0
votes
1
answer
87
views
Do surface plasmon-polaritons travel in one direction or do they oscillate at the frequency of the photons that excite them?
Sorry if this question doesn't make sense; this is way out of my field of study. From what I've read about SPP's, they seem to be oscillations in electron densities moving over the surface of a metal/...
- 13
1
vote
1
answer
359
views
Negative refractive index of gold
The condition of a propagating surface plasmon wave in a metal film is that the refractive indexes of the metal and surrounding medium are opposite and equal (please correct me!) but this requires ...
- 133