Light absorption and reflection

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SUMMARY

The discussion focuses on the interaction of light with matter as described by the Drude-Lorentz model, specifically examining the implications of complex wave-number k. The real part of k indicates light propagation, while the imaginary part represents damping. When Re(k)=0 and Im(k)≠0, an evanescent wave is formed, leading to total reflection without absorption. However, at resonance frequencies, the reflectance coefficient approaches 1, suggesting complete reflection, which raises questions about the potential for resonance absorption.

PREREQUISITES
  • Understanding of the Drude-Lorentz model of light-matter interaction
  • Familiarity with complex wave-number concepts in optics
  • Knowledge of evanescent waves and their properties
  • Basic principles of reflectance and absorption in materials
NEXT STEPS
  • Research the properties of evanescent waves in optical systems
  • Explore resonance absorption phenomena in materials
  • Study the mathematical formulation of the Drude-Lorentz model
  • Investigate the implications of complex refractive indices on light behavior
USEFUL FOR

Physicists, optical engineers, and students studying light-matter interactions, particularly those interested in advanced topics like resonance absorption and wave propagation in materials.

eoghan
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Hi there!
I have a question about the classical interaction of light with matter according the Drude-Lorentz model. Let's suppose that the light in matter has a wave-number k which in general is complex. Then the real part of k accounts for the propagation of light, while the imaginary part of k is a dumping factor. Can I figure out the behavior of light? I mean, e.g. if Re(k)=0 and Im(k)\neq0 then I have an evanescent wave: does this mean that light is absorbed or reflected?
Thank you
 
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Uhm.. sorry, but I'm not english... don't you answer because my english is too bad that you don't understand the question or just because you don't know the answer?
In the former case I'll try to put it in other words:

The reflectance coefficient at a resonance frequency (k->infinity) is 1, therefore the light beam is reflected entirely and there is no absorption. But at a resonance frequency, shouldn't I get a resonance absorption?
 

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