Supressing dielectric constant of water?

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SUMMARY

The discussion centers on the challenge of suppressing the dielectric constant of water for a project involving quantum dot coupling efficiency. The author references a paper (doi:10.1103/PhysRevB.76.035420) that uses a dielectric constant of 2 for the surrounding medium, contrasting it with water's higher dielectric constant, which negatively impacts coupling efficiency. Suggestions include using salt to depress the dielectric constant and exploring supercritical water as a potential solution. It is noted that the permittivity of water at optical frequencies is approximately 1.8.

PREREQUISITES
  • Understanding of dielectric constants and their impact on quantum dot interactions.
  • Familiarity with the concept of permittivity in different frequency ranges.
  • Knowledge of supercritical fluids and their properties.
  • Basic principles of quantum dot physics and coupling mechanisms.
NEXT STEPS
  • Research the effects of salt concentration on the dielectric constant of water.
  • Investigate the properties and applications of supercritical water in quantum dot experiments.
  • Learn about the frequency dependence of dielectric constants in various materials.
  • Explore alternative surrounding media with lower dielectric constants for quantum dot applications.
USEFUL FOR

Researchers and engineers working in quantum dot technology, materials scientists, and anyone involved in optimizing coupling efficiency in photonic applications.

excalibur313
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Hey Everyone. I am doing a project proposal where I am calculating the coupling efficiency between a quantum dot and a wire and I need to enter in values for the dielectric constant of the wire and the surrounding medium. I am working off a paper (doi:10.1103/PhysRevB.76.035420) where he uses the dielectric constant for the surrounding medium to be 2. I would like to do this in water which has a much higher dielectric constant and unfortunately it seems to kill off the really efficient coupling that I was getting. Does anyone know of a way to suppress the dielectric constant and to somehow quantify how low I can get it? I know salt will depress it, but how much would I expect? I read that if I get water at a supercritical phase I can get it pretty low, but does anyone know of any other way? Thanks a lot for your help!
 
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The dielectric "constant" of water is very much a function of frequency... presumably if you are interested in quantum dots you'll be using optical frequencies?
In that case the permittivity of water is actually rather low (about 1.8).
 

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