Thin Metallic layers present anomalies related to the Optical properties of bulk materials, thin films Wave propagation, transmission or absorption. I want to know the scientific origin of these anomalies. Are these anomalies caused by the technics of elaboration, the experimental conditions or other reasons?
Could you elaborate a bit about "thin" and "anomalies"? What thicknesses and which "special effects" do you have in mind?
Alain, you may find the topic of surface plasmon resonance to provide at least an introduction to this topic. The publication below and the references therein may be of interest to you.
https://www.researchgate.net/publication/236336963_Reaching_the_Theoretical_Resonance_Quality_Factor_Limit_in_Coaxial_Plasmonic_Nanoresonators_Fabricated_by_Helium_Ion_Lithography
Article Reaching the Theoretical Resonance Quality Factor Limit in C...
The only think I know on the topic is that, when the metal thickness becomes too thin, electrons are no longer as free as their are on the bulk, so that the optical properties are a little bite modified. But this sounds obvious.
The term "thin" refers to the nanometric scale. The anomalies I said are related to the Surface irregularities and crystalline order. They strongly influence both the scattered light and absorption of metallic films. If the disorder is present on a sufficiently fine scale, it also affects the band structure of the metal and hence its optical absorption. One of the consequences is the decreasing of the diffusion length of the minority carriers. How to use very thin metallic layers minimizing these defects?
Thanks for your answers Dear Researchers.
Thanks a lot, that makes things much clearer. Just one more question: What optical energies (i.e, which wavelengths) do you refer to?
Thanks Jan-Martin Wagner
I refer to the Visible and Ultraviolet.
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