Re: Does the ElectroMagnetic Wave have cross-section area !
Dear sifeddin
ahmed osama asked quoting "Electromagnetic Wave is quite a complicated model for the wave equation of the photons best described by maxwell's equations, so it may have
cross-section area".
EM wave
in guided medium for example a simple TEM wave (lets not complicate with light for now)
does for sure have a cross-section area. Pictures are valid for that matter.
I honestly apologize I started to read thread from the above question while question was for something else.
I hope I clarify this. Come on sifeddin why should I get mad. My pictures are okay. Kidding.
ahmed osama said:
I will till you how this question come to my mind ,Now we all know the square law of the light
A2 r2^2
------ =------------
A1 r1^2
A1:area of radiating surface
A2: area of illuminated surface
r: distance from the origin
from the above equ. it is impossible that the origin area of the light to be zero !! So it must have a certain area !!!
Square law is something belonging more to ray-optics area instead to what truly light should be studied. Why would I say that?
No matter of what intensity,polarization,etc think of the source an antenna radiating EM wave that would be light wave in our case.
What ray-optics domain under-estimates is the fact origin of light radiation source. Is it monopole, dipole, horn, a flat patch antenna, helical source of radiation? Pattern of radiation is "a lot" different for all these sources.
Quoting you:
"it is impossible that the origin area of the light to be zero" actually study of antennas start with radiating intefinitisimal point-sources of having cross-section area zero and these are valid.
ahmed osama I hope a clarify something. Others have added very valuable information.