Adsorption of a evanescent waves

In summary, adsorption of evanescent waves refers to the absorption of electromagnetic waves by a material at the interface between two media, resulting in a transfer of energy to the material. It differs from regular adsorption in that it involves the absorption of waves rather than the adherence of particles. This phenomenon has various applications in fields such as biology, chemistry, and material science, and can be measured using techniques such as ellipsometry and surface plasmon resonance spectroscopy. Factors such as wavelength, angle of incidence, refractive index, and surface properties can influence the adsorption of evanescent waves.
  • #1
maurice74
4
0
The question is:
in a total reflection setup, we have an evanescent waves created in the second medium, under the separation surface. If this medium is highly adsorbing, would then affect the reflected light ?
Let's say the first medium has adsorption zero, while the second is highly adsorbing. Would that change the reflectivity of the surface ?
 
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  • #2
Yes. Write out the Fresnel Coefficients for the problem. A lossy material has a complex ##\epsilon## or ##\mu##
 

Related to Adsorption of a evanescent waves

1. What is adsorption of evanescent waves?

Adsorption of evanescent waves is a phenomenon in which electromagnetic waves are absorbed by a material at the interface between two media, such as a solid and a liquid. This absorption occurs due to the close proximity of the waves to the surface of the material, resulting in a transfer of energy from the waves to the material.

2. How is adsorption of evanescent waves different from regular adsorption?

Regular adsorption refers to the process of molecules or particles adhering to the surface of a material. In contrast, adsorption of evanescent waves involves the absorption of electromagnetic waves by the material's surface, resulting in a transfer of energy to the material rather than the physical adherence of particles.

3. What are the applications of adsorption of evanescent waves?

Adsorption of evanescent waves has various applications in fields such as biology, chemistry, and material science. It is often used in biosensors, where it can detect small changes in the refractive index of a liquid by measuring the amount of evanescent waves absorbed by the material's surface. It is also used in surface plasmon resonance, which is used for studying molecular interactions on a surface.

4. How is the adsorption of evanescent waves measured?

The adsorption of evanescent waves can be measured using techniques such as ellipsometry, which measures changes in the polarization of light as it interacts with the material's surface. Other methods include surface plasmon resonance spectroscopy, which measures changes in the resonance angle of light as it interacts with the material's surface.

5. What factors influence the adsorption of evanescent waves?

The adsorption of evanescent waves can be influenced by factors such as the wavelength of the incident light, the angle of incidence, the refractive index of the material, and the properties of the material's surface, such as its roughness or chemical composition. Temperature, pressure, and the presence of other substances can also affect the adsorption of evanescent waves.

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