Comparing different parpameters to be a plasmonic material

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In summary: Higher frequencies lead to better scattering, but at the cost of increased losses. Lower frequencies are less scattering, but may lead to lower light emission.
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Debnath
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Hello Everybody

I want to do the comparison of metals like Silver, Gold, Aluminum, Copper, Sodium and Potassium as plasmonic metals. Now, I am confused about some parameters about what they really mean.

1. what does ε(int) means? Is it better for a plasmonic material to have less ε(int)?

2. What does "Plasma Frequency of a metal in eV" means here?

3. What does ω(int) in eV means? Is it better to have more value of ω(int) in eV to be a better Plasmonic material?

4. What does dumping rate in eV means? How it effect the property of a plasmonic material?

5. What does happen if the light is incident to a plasmonic material below or more than plasmon frequency? Why this plasmon frequency is that so important?

6. In a plasmonic material, the prime target is scattering of light? Why not absorption or transmission? What will be the problem if the light will be either absorbed or transmitted?

I will be very much grateful if someone can give my answers. Also, if anyone can suggest any paper or, textbook where I can get those answers, I will be really so grateful.

Thanks in advance.
 
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  • #2
Any book on solid state theory should contain a chapter which explains most of the questions you are asking for, especially the meaning of plasma frequency, dielectric constant of a metal and its relation to the frequency of surface plasmons. Try e.g. Ashcroft and Mermin, Solid state physics.
 
  • #3
Thank you DrDu

But it would be great if you can tell me now, what is ω (int) in eV means? It might be connected to Interband loss of a metal. If you can let me know about how it is related to Interband loss. And which one is better plasmonic metal actually with having ω (int) 3.2 or 1.2?

Thanking you in advance
 
  • #4
I am not a specialist on plasmonics. I may be that ω(int) is the band gap.
Where did you find all these parameters? Are you referring to a specific article?
Would be helpful to have some background information.
I think you can't say absolutely which combination of the parameters makes a better plasmonic material. It rather depends on the frequency range you want your material to operate.
 

1. What are some important parameters to consider when comparing different materials for their plasmonic properties?

Some important parameters to consider include the material's dielectric constant, electron density, and refractive index. These properties can affect the material's ability to support plasmonic modes and determine its plasmonic resonance frequency.

2. How does the dielectric constant of a material impact its plasmonic properties?

The dielectric constant, also known as the permittivity, is a measure of a material's ability to store electrical energy. In plasmonics, this property is important because it affects the strength of the electric field oscillations and the plasmonic resonance frequency. Generally, materials with higher dielectric constants are more suitable for plasmonic applications.

3. What role does the electron density play in determining a material's plasmonic properties?

The electron density, or the number of free electrons in a material, is a crucial parameter in plasmonics. It determines the strength of the plasmonic oscillations and the energy losses due to electron scattering. Materials with high electron density are more favorable for plasmonic applications.

4. Why is the refractive index an important parameter for plasmonic materials?

The refractive index is a measure of how much a material can bend light. In plasmonics, this property affects the propagation and confinement of plasmonic waves. Materials with higher refractive indexes are generally preferred for plasmonic applications as they can better confine the plasmonic fields and enhance their interactions with light.

5. How do different materials compare in terms of their plasmonic resonance frequencies?

The plasmonic resonance frequency is the frequency at which a material can support plasmonic modes. Different materials have different resonance frequencies, which can be determined by their physical properties such as dielectric constant and electron density. Generally, materials with high electron density and low refractive index have lower resonance frequencies, making them more suitable for plasmonic applications in the visible and near-infrared regions.

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