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Can light travels without electromagnetic field ?

  1. Jun 28, 2014 #1
    Can light travels without electromagnetic field ?
    Thanks
     
  2. jcsd
  3. Jun 28, 2014 #2
    Light IS a traveling electromagnetic field.
     
  4. Jun 28, 2014 #3

    Drakkith

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    Staff: Mentor

    Light is a wave within the electromagnetic field itself. So no, it cannot travel without the EM field.
     
  5. Jun 29, 2014 #4
    yes , light in the nature is a electromagnetic wave and there are other forms of electromagnetic wave which are not visible. for example, X-ray, infrared light, radio wave. electromangeic wave is a name give for a large number of things.
     
  6. Jun 29, 2014 #5

    UltrafastPED

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    It depends upon what qualifies as "travel" ... for instance, when light strikes a surface that contains very small holes ... smaller than the wavelength of the light ... then the light cannot propagate inside of the holes.

    However, if the front and back sides of the surface, and the interior of the holes are metallic, then the impinging light can create plasmons, a quantum quasi-particle, then these plasmons can propagate through the holes, and when they reach the back side of the material they act as little antennas which regenerate the light that was incident on the other side of the holes.

    Plasmons have both electric and magnetic fields associated with them, so perhaps this violates rule two.
     
  7. Jun 29, 2014 #6

    davenn

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    Nice one, UltrafastPED, something totally new to me .... had to google plasmon to learn more :smile:

    Dave
     
  8. Jun 30, 2014 #7

    vanhees71

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    The point is that Answer #2 is already correct. Light is an electromagnetic field. It doesn't make any sense to ask, wheter light can travel without an electromagnetic field. If there is no electromagnetic field, there is no light. It's as simple as that :-).
     
  9. Jun 30, 2014 #8
    Thanks
     
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