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Plasmonic nanoparticle scatering efficient differences

Dears, I got a question for you. I am thinking which nanoparticle shape, nanorods or nanospheres, will have a higher light scattering efficiency, that is without considering the light absorbance due ...
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5 views

how do hybrid plasmonic waveguides work?

I was hoping that someone could clarify the operation of hybrid plasmonic waveguides for me. what I read on wikipedia left me with some questions: If the operation is based on coupling the ...
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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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24 views

Do silver or gold nano-partcles possess fluorescence?

my question is not only about silver or gold but any other metal nano-particles. Anyway, I'm personally interested in silver. So why do the tiny clusters (several atoms) of silver and gold possess ...
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2answers
91 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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113 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
48 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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18 views

Is there theoretical description of such plasmonic nanostructure?

I'm preparing a reasearch 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....
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1answer
114 views

Is surface plasmon Fermion or Boson?

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
65 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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34 views

Why is the magnetic energy smaller than the electric energy?

According to this paper, http://www.nature.com/nnano/journal/v10/n1/full/nnano.2014.310.html, if the optical resonator size is less than λ/2, the magnetic energy is smaller than the electric energy. ...
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44 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
108 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
308 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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0answers
54 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
29 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
235 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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1answer
74 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
261 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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1answer
109 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
98 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
62 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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1answer
1k 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
154 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
2k 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
124 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 ...
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1answer
77 views

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). ...
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310 views

How Do Electrons “Resonate Against the Restoring Force Of Positive Nuclei?”

While reading "Surface Plasmon Resonance," I came across the following: "The resonance condition is established when the frequency of light photons matches the natural frequency of surface ...