does light follow a helical path ?


by shiveeshfoteda
Tags: electromagnetics, optics
shiveeshfoteda
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#1
Sep9-13, 10:51 AM
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as the Electric field is perpendicular to magnetic field , would the over all sum of the sinusoidal waves would turn up to be a helical shape ?
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DaleSpam
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Sep9-13, 11:37 AM
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It sounds like you are talking about circular polarization. Yes, you can have circular polarized light.
HallsofIvy
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#3
Sep9-13, 11:48 AM
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But "circularly polarized" means that the "intensity vector" of the light wave describes a helix around the path of the light. Light does NOT "follow a helical path".

Nugatory
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Sep9-13, 11:51 AM
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does light follow a helical path ?


Quote Quote by shiveeshfoteda View Post
as the Electric field is perpendicular to magnetic field , would the over all sum of the sinusoidal waves would turn up to be a helical shape ?
No.

Those diagrams you see, in which the E and the B field are both sinusoidal curves oriented perpendicular to the direction of movement, can be very confusing. They aren't pictures/illustrations and nothing is moving sideways - they're just graphs that allow you to read off the magnitude and direction of the field at a particular point.

The light wave (in the simplest case of a plane wave, which is what those diagrams are describing) is a plane wave. If the wave is travelling in the +x direction, then for every point in any plane of constant x (and varying y and z values) at any given time the direction and magnitude of the E field will be the same and will vary sinusoidally over time; and likewise for the B field.
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Sep9-13, 12:00 PM
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Quote Quote by HallsofIvy View Post
But "circularly polarized" means that the "intensity vector" of the light wave describes a helix around the path of the light. Light does NOT "follow a helical path".
Yes, perhaps I was over-interpreting the OP. The polarization describes the orientation of the fields, not the path.


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