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## Main Question or Discussion Point

Hi Guys,

I was reading about plasmons on wikipedia and I found that there are some materials with negative dielectric constant, what I know is that there are complex dielectric and reflection coefficient constants due to reflection in metals, can we relate the the complex dielectric constants to negative dielectric constants?

and what is the physical explanation and results for having negative dielectric constant?

Thanks for reading

I was reading about plasmons on wikipedia and I found that there are some materials with negative dielectric constant, what I know is that there are complex dielectric and reflection coefficient constants due to reflection in metals, can we relate the the complex dielectric constants to negative dielectric constants?

and what is the physical explanation and results for having negative dielectric constant?

Thanks for reading