What causes photon diffraction through thin air?

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Discussion Overview

The discussion revolves around the phenomenon of photon diffraction, particularly in the context of thin air and diffraction grating experiments. Participants explore the underlying mechanisms of diffraction and the nature of quantum particles compared to classical particles, as well as the implications of these concepts in various applications.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant questions what specifically causes photons to diffract as they pass through thin air, noting the apparent lack of interaction between photons and air molecules.
  • Another participant suggests that quantum-mechanical particles do not behave like classical particles, indicating that classical explanations may not adequately describe photon behavior in diffraction scenarios.
  • A participant reflects on the historical context of the question, mentioning that even in academic settings, satisfactory answers regarding photon diffraction have been elusive.
  • One post introduces the concept of surface plasmons and their effect on light reflection in gratings, noting that while it does not directly explain diffraction, it highlights interesting applications in focusing light and other technologies.

Areas of Agreement / Disagreement

Participants express a shared sense of curiosity regarding the mechanisms of photon diffraction, but there is no consensus on a definitive explanation. Multiple competing views and uncertainties remain about the nature of photons and their interactions.

Contextual Notes

The discussion highlights limitations in understanding the quantum behavior of photons and the challenges in reconciling classical and quantum physics perspectives. There are also unresolved aspects regarding the specific mechanisms of diffraction in air.

Who May Find This Useful

This discussion may be of interest to those studying quantum mechanics, optics, or anyone curious about the fundamental nature of light and its interactions with matter.

Schrodinger's Dog
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I was thinking about difraction grating experiments and slit experimenets in general when I got to thinking what is it that actually diffracts the photons as they pass through the slit which is to all intents and purposes thin air? I've heard about inteference and looking at water it's obvious with molecules why this happens, but photons don't interact very readily at all so how does this work? is this one of those grey areas or is there something interesting going on?
 
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Schrödinger's Dog said:
is there something interesting going on?

Yes. Quantum-mechanical particles do not behave like classical particles. They don't behave like little billiard balls that simply bounce off of obstacles or each other, or interact with each other according to the laws of classical physics. No one (as far as I know) has come up with a "classical" picture of QM that doesn't fail under some circumstances (i.e. doesn't agree with some experiments), or doesn't have some "weird" features anyway.
 
Ah i see, I asked a colleague of mine and he said, well to be honest when I was studying physics at degree level they never really did answer that question satisfactorily(so I'm thinking obviously at some point most people ask this question and are given the same answer)
Just trying to find out if in the 35 years since he'd studied physics, if there had been any ideas concerning this. It's kind of pleasing in a way to have your question unansered, it makes you feel like your asking the right questions in a strange sort of way. But it's kinda like an itch you can't scratch:confused:
 
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here's something interesting if not entirely related I read in a magazine

Surface plasmons affect the way light reflects off agrating, if light is polarised in the same direction as the grooves, the spectrum is continuous, but perpendicularly polarised light can couple to surface plasmons and be absorbed at certain wavelengths.

It doesn't explain difraction but it is being used in gratings to focus light,something that was not possible before.

The applications are endless, metal films that are transparent, imaging living cells probing the vibrations of single molecules. Interesting stuff
 

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