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Questions tagged [plasmon]

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Momentum mismatch on surface plasmon

I read Naturevolume 424, pages824–830 (2003). There is following sentence. "This increase in momentum is associated with the binding of the SP to the surface, and the resulting momentum mismatch ...
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1answer
29 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 ...
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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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14 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 $l = 0, 1, 2, ...$ $$\omega_l = \sqrt{\frac{l}{2l+1}} \omega_p$$ ...
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How to perform quantum logic gates on plasmons?

in the link provided researches utilize strong two-plasmon absorption in graphene nanoribbons to create a “square-root-of-swap”, could such a device be utilized to perform other quantum logic gates? ...
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1answer
15 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 ...
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1answer
21 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 ...
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42 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 ...
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1answer
28 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://...
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1answer
111 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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30 views

Long-ranged Coulomb Interaction $\Rightarrow$ Longitudinal Plasmon Modes?

I am currently taking a lecture on quantum theory of condesed matter systems. In the lecture notes it is stated that For long-ranged Coulomb interactions only longitudinal plasmon modes are ...
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1answer
26 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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77 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 ...
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32 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....
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3answers
86 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.
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1answer
50 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 ...
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1answer
119 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 "...
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2answers
415 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 ...
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28 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 ...
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1answer
206 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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1answer
2k 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. ...
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1answer
45 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 ...
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110 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: \...
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171 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 ...
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277 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 ...
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1answer
67 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/...
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1answer
206 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 ...
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1answer
99 views

polarization of metallic nanoparticles

Are there any experimental or simulation based studies where nanoparticles which lie on the substrate (defined by the x-y plane) and the polarisation (electric field direction) is along the z axis (i....
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136 views

Plasmon quenching vs plasmon decay. What is the difference?

I'm reading an article "Quenching, Plasmonic, and Radiative Decays in Nanogap Emitting Devices" (pubs.acs.org/journal/apchd5). I don't understand the following: Counterintuitively, we evidence ...
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2answers
708 views

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 ...
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1answer
455 views

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 ...
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1answer
142 views

Modes in 1D cavity with loss

Let consider the simple problem of : 1D electromagnetic cavity with perfect conducting walls filled with a conducting medium Let the length of the cavity be L, the conductivity be $\sigma$ and ...
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50 views

Is there theoretical description of such plasmonic nanostructure?

I'm preparing a research about plasmonic nanoparticles and I'm interested about their arrays placed above a metallic film (like on the picture). Until now i found following articles: pubs.acs.org/...
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3answers
780 views

Are surface plasmons fermions or bosons?

When photons are converted into surface plasmon in some artificially designed structure such as metal gratings to provide the additional momentum, is the boson character of photons are preserved or ...
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1answer
183 views

Transmission of light, sub-wavelength apertures, and cut-off frequencies

I was hoping someone could please explain how the transmission of light through a sub-wavelength aperture in a metal film, at a particular wavelength, changes when the aperture is: i) above cut-off ...
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95 views

How to design a grating coupler to produce surface plasmon-polaritons (SPPs) at a desired frequency?

Following on from this question, which I found very useful on the topic, I was wondering how you would use the equation $\beta = k sin \theta \pm \nu g$ to fabricate a grating coupler to generate SPPs ...
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1answer
305 views

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 ...
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2answers
1k views

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 ...
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73 views

UV Plasmon Resonance

Are there any techniques available for getting thin films of gold(or any other metal that is resistant to oxidation) to generate plasmon resonances in the shortwave UV-C region?
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1answer
54 views

Why is Al2O3 so popular in plasmonics?

I've tried to find my own solution for this question and found out that It is cheap It is an insulator It efficiently absorbs UV Are there more properties that makes it so popular?
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1answer
421 views

Kittel solid state physics handbook - Plasma oscillation of a ball - Am I solving this right?

I'm self learning nanotechnology undergraduate and I'm trying to solve a problem from chapter "plasmons, polaritons and polarons". This is it: Frequency of uniform mode of plasmons in a ball is ...
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117 views

Why does the group velocity of 2D plasmon diverge at small wave number?

Now plasma represents collective wave-like motions of charged particles. In 3D, their frequency is well known to be almost a constant, $\omega^{3D}_p \approx \sqrt{4\pi n e^2/m}$, with $n$=charge ...
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1answer
380 views

Difference in electrons excitation in Au (111) between perpendicular and diagonal orientation?

In Au (111) single crystalline as shown in attached file, is there a difference the way electrons are excited when they are excited from perpendicular and diagonal orientation as shown in the figure (...
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2answers
209 views

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? ...
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1answer
235 views

Why can we allow the speed of light being infinite in case of Surface Plasmons?

I have a problem with understanding of these sentences: We have indicated in the opening paragraph of the Introduction that surface plasmon polaritons are solutions of Maxwell’s equations in ...
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2answers
172 views

What is light localisation?

Reading about plasmonic nanoparticles I faced the term "localised light". How can one localise light? What are applications of it?
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5k views

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.
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1answer
394 views

Electric field inside a metal nanoparticle?

In localized surface plasmon resonance, the conduction electrons of a metal nanoparticle oscillate in tune with the frequency of the incident electromagnetic wave . The effect is dominated by ...
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3answers
3k views

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 ...
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1answer
212 views

Exciting Surface Plasmons using ATR

I'm very new to the topic of surface plasmons and I have been reading about different methods of exciting them. There is one method in which a prism is set up to allow phase matching of an incident ...