Re: Another polarization question

On Dec 29, 3:38 am, Helmut Wabnig <hwabnig@ .- --- -. DOT .- t> wrote:
On Fri, 28 Dec 2007 15:27:49 -0000, "Fleetie"



<flee...@xxxxxxxxxxxxxxxxxxx> wrote:
"Helpful person" <rrl...@xxxxxxxxx> wrote
If the separation of the blinds is small then light will not be able
to vibrate in that direction. Hence the light passing through it is
polarized. This efficiency is dependent on the blind separation as
compared to the wavelength of light.

So are you saying then that the waves that are vibrating parallel
the lengths of the open "slits" are the ones that get through?

If so, have you looked at the wikipedia article on this?

"Note that the polarization direction is perpendicular to the wires; the
concept that waves "slip through" the gaps between the wires is incorrect."

http://en.wikipedia.org/wiki/Polariser

Martin

Wire mesh is made of ectrically conducting material.
A horizontally oriented slot antenna radiates vertically polarized.
Think of the wire mesh as an array of slot antennas.http://hjem.get2net.dk/ole_nykjaer/oz2oe/antenner/10wg.html

Dielectrical antennas made of insulating material
react the other way round.
Think of the plastic molecules as dielectical slots.

w.

All of the interesting discussion so far does not directly address the
spectral properties. The mechanism discussed should work as long as
the slits *wires, etc..) are narrow compared to the wavelength. Why
do polarizers lose extinction ratio as the wavelength grows longer
outside the range? Why would not one polarizer with narrow enough
slits fit all wavelengths longer than a certain starting wavelength?

TIA,
Mike
.

Relevant Pages

  • Re: Another polarization question
    ... Hence the light passing through it is ... concept that waves "slip through" the gaps between the wires is incorrect." ... are narrow compared to the wavelength. ... do polarizers lose extinction ratio as the wavelength grows longer ...
    (sci.optics)
  • Re: Playing with polarisers- color effects
    ... quarter-wave plate is only a quarter-wave plate at one wavelength, ... as you depart from that wavelength, ... Even the purely linear polarizers are not completely ... in stacking the polariser on top of the UV filter? ...
    (rec.photo.digital)
  • Re: Another polarization question
    ... do polarizers lose extinction ratio as the wavelength grows longer ... The absorption of light is not complete-to-extinction, ...
    (sci.optics)
Quantcast