How shape of pattern affects the behaviour of light

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Discussion Overview

The discussion revolves around how the shape of patterns, particularly in biological structures like those found in chameleons, affects the behavior of light. Participants explore concepts related to structural coloration, photonic crystals, and the mechanisms of light reflection and absorption.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant notes that chameleons can change color by altering the structural arrangement of their skin cells, suggesting that the shape of particle patterns influences light behavior.
  • Another participant proposes that the spacing between lattice atoms in chameleons affects the reflection of light, particularly noting that excited states reflect lower frequency waves while relaxed states reflect higher frequency photons.
  • A different viewpoint introduces the concept of photonic crystals, questioning how these structures can control the propagation of specific wavelengths and whether this is related to Bragg's law.
  • One participant expresses uncertainty about whether interference or absorption is the primary mechanism at play, indicating a lack of clarity on the specifics of how these processes work in relation to light behavior.

Areas of Agreement / Disagreement

Participants do not reach a consensus, as multiple competing views regarding the mechanisms of light behavior and the role of structural arrangements remain present throughout the discussion.

Contextual Notes

Participants acknowledge the complexity of the mechanisms involved, with some noting the need for more specifics on how absorption and interference contribute to the observed phenomena.

nicolauslamsiu
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chameleon can change the colour of its skin by changing the structural arrangement of cell layers. I found someone said that the shape of patterns of particles can determine how the light behaves when striking the object. I wonder how it works?
 
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I think the simple explanation is that the space between special lattice atoms is more likely to reflect a photon of light, more so with lower frequency waves. An excited chameleon has a lattice which not only reflects to change color but also to reflect near-infrared light for thermoregulation. When they relax the absorbing atoms are closer together which reflect blue higher frequency photons but absorb most others. They have a yellow pigment to begin with mixed with the relaxed blue makes the typical green.
 
I've also heard that it is possibly due to the formation of photonic crystals and photonic crystals have band gap which can control the propagation of certain wavelength. I want to know how it can control the wavelength that can propagate through the crystals. Is it something related to bragg's law?
 
I'm not sure if interference or just simply absorption is the primary mechanism. It seems to me absorption is necessary for them to use near-infrared for heat, but I really don't know enough specifics to have a reliable answer.
 

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