Photon radius and affected energy in double-slit experiments

• gnarlan
In summary, the conversation discusses questions about the behavior and properties of photons, specifically in relation to the double-slit phenomenon. It questions the maximum width of the slits that can still produce interference, the validity of using this method to determine photon "radius", and whether the maximum width is dependent on frequency. Additionally, it considers the energy and momentum of the photon at the point of observation. The conversation concludes with a request for insights from experimenters. The summary also mentions that a photon does not have a "radius" and its size depends on the coherence of the wave. It also states that the frequency and energy of the photon remain the same when it reaches the screen.
gnarlan
Hi all, these questions have nagged me for years and I have never found a text or a paper that even addresses them.

Regarding photon "radius", what is the maximum width that two slits can be spaced which still permits the double-slit phenomenon to occur? Would this be a valid method of determining photon "radius"? Additionally, is that maximum width dependent upon frequency or is it the same for all photons?

Relatedly, if at any point beyond the slits, we attempt to observe the photon, we of course lose our interference pattern. But, does the photon that arrives at the photosensitive sheet possesses the same energy-momentum as the "pre-split" photon?

I appreciate any insight from you experimenters our there :) Cheers.

A photon does not have a "radius". It is the quantized version of a classical wave packet, and its size depends on how close the wave is to a pure plane wave. To obtain coherence over a larger distance you want a smaller spread in frequency and propagation vector. Experimentally this is determined by the quality of your laser.

The photon, when it reaches the screen, has the same frequency it started with, and the same energy.

1. What is a photon radius?

A photon radius refers to the theoretical size or distance from the center of a photon to its outer edge. This concept is often used in double-slit experiments to understand the behavior of photons as they pass through the slits.

2. How does the photon radius affect the results of a double-slit experiment?

The photon radius plays a crucial role in determining the diffraction pattern observed in a double-slit experiment. The smaller the photon radius, the more closely the photons will behave like particles, creating a distinct pattern on the detector. A larger photon radius may result in a more diffused pattern, indicating more wave-like behavior.

3. Can the photon radius be measured?

Currently, there is no experimental method to directly measure the photon radius. It is a theoretical concept used to understand the behavior of photons in certain experiments.

4. How does the affected energy of a photon change in a double-slit experiment?

In a double-slit experiment, the affected energy of a photon remains constant as it passes through the slits. However, the distribution of this energy can vary depending on the size and position of the photon radius, which affects the diffraction pattern observed on the detector.

5. Is the photon radius a constant value?

The photon radius is not a constant value and can vary depending on the experimental conditions. In some cases, it may be useful to consider the photon as a point particle with no discernible radius, while in other cases, the photon radius may be a crucial factor in understanding the behavior of photons.

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