Tuesday, December 7, 2010
PRODUCTION OF POLARIZED LIGHT
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In this section we will study various methods for the production of linearly polarized light waves. The wire grid polarizer and the polaroid. A wire grid polarizer consists of a large number of thin copper wires placed parallel to each other. when an unpolarized light wave which is of course an electromagneic wave is incident on it, then the component of electric vector parallel to the length of wire is absorbed. This is because of the fact that the electric field does not work on the electrons inside the thin wires and the energy associated with the electric field is lost in the joule heating of the wires. On the other hand, as the wires are assumed to be very thin, the component of electric vector along x-axis passes through without much alternation. Thus, the emergent beam is linearly polarized with electric vector along the x-axis. However, for the system to be effective (i.e for the Ev component to be almost completely atteunated, the spacing between the wires should be clearly, the fabrication for such a polarizer for a 3 cm micro wave is relatively easy because the space has to be ~3cm. on the other hand, as the light waves are associated with a very small wavelength
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