Questions tagged [plasmon]

The quantum of plasma oscillation, arising from the quantisation of plasma oscillations

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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?
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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?
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How the Mathematical Derivation for wave vector is obtained for both real and imaginary part in Surface Plasmons?

I went through the book "Surface Plasmons on Smooth and rough surface and on Gratings by Raether." If you look at the equations 2.4, 2.5, and 2.6 in the link below: https://ui.adsabs.harvard....
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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 ...
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Does the inelstic mean free path change with the doping concentration?

Does the bulk plasmon cross section depend on the doping concentration? I measured EELS for three different doping concentrations of silicon and the inelstic mean free path seems to increase ...
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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? ...
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How can we obtain a complex wave vector by using dielectric constant in Surface Plasmons?

I hope you all are doing well. I have shared the most information I can please do let me know if there are any books or pdf other than the one I have uploaded which might be helpful to me. I have ...
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Absorption spectra mismatch using Mie-Gans theory and COMSOL software

I tried to compute the absorption spectra using Mie-Gans theory and COMSOL software. For the same prolate ellipsoid with same parameters (size, material etc.) the longitudinal resonance wavelength ...
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Achieving better signal by sanding waveguide at 45 degrees for Surface Plasmon Resonance

I wanted to replicate a Surface Plasmon Resonance (SPR) setup using a waveguide. Currently my setup looks like the following where I have a glass slide (20 mm x 20mm x 1mm) with thin gold film on top. ...
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Coupling of Localized Surface Plasmon SERS

I start working on SERS, but I am a chemist. So I am not familiar with the physics behind it. I studied a lot of papers on the topic and got deeper into the physics behind it. So I had a challenging ...
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Effects of sensing area on the performace of Surface Plasmon Resonance phenomena

I would like to know how the parameters of the sensing region like the overall area of the sensing region, its thickness, and what will happen if the coating of the gold film is not uniform on the ...
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55 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 ...
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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\...
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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 ...
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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 ...
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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", ...
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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 ...
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37 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 ...
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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.
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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 ...
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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?
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43 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 ...
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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 ...
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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 ...
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How to calculate plasma frequency?

i am wondering about Plasma frequency magnitude. According to the image i want to plot that graph.
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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 ...
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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 ...
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471 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 $\mathbf{p}$ ...
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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 $l = 0, 1, 2, ...$ $$\omega_l = \sqrt{\frac{l}{2l+1}} \omega_p$$ ...
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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 ...
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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 ...
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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 ...
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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://...
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241 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 $ ...
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62 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?...
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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 ...
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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....
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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.
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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 ...
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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 ...
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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 "...
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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 ...
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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 ...
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327 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, ...
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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. ...
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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 ...
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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: \...
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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 ...
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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 ...
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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/...