What is the physical reason for the high value of the imaginary part of the permittivity of a noble metal?

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Thomas Mayerhöfer

It's the free electrons - the higher the conductivity the higher the imaginary part of the permittivity. Have a look at Drude's theory!

Saad Zahraw Sekhi

Thanks Thomas Mayerhöfe.

Hanaa Ibraheem Mohammed

Due to the presence of an abundance of free electrons in the metal, which leads to an increase in conductivity and thus an increase in the imaginary part of the permittivity.

Thanks Thomas Mayerhöfer, and Hanaa Ibraheem Mohammed.