![]() The effect of a polarizer is to transmit light that is polarized in the same direction as that of the polarizer, and to block (absorb or reflect) light that is polarized at right angles to the direction of the polarizer. is normalized such that: p11 p11 pd11 1 where d element of solid angle 4. Then the term,, is the phase function or scattering diagram which defines the probability for scattering of unpolarized incident light in any direction. The orientation of the lines is referred to as the polarization direction of the polarizer. For our purpose here, lets consider the total intensity of the radiation whether polarized or not. When unpolarized light is incident on a polarizer, the intensity of transmitted light from the polarizer reduces to one-half of the incident light. The unpolarized light is considered to be composed of two linear and orthogonal polarization states with complete incoherence. (12.3.6) (12.3.6) P ( cos 2 cos sin cos sin. The unpolarized light is represented in figure- 1(a). For example, a perfect polarizer with an axis at an angle from the 1 axis can be represented by. Schematically, one typically depicts a polarizer by means of a rectangle or a circle filled with parallel line segments. The effects of wave plates and polarizers and the like can be summarized by multiplication of the Z Z vector by 2×2 matrices. In other words, one causes the light to be normally incident upon the polarizer. I PAee P 4 2 Analyzing the above equation, we can see that light intensity diminishes with the square of the distance from the source. In use, one typically causes light to travel toward a polarizer along a direction that is perpendicular to the polarizer. A sample of such a flat sheet is called a polarizer. \) clockwise from the vertical is, however, unambiguously:Ī plastic material is manufactured in the form of flat sheets that polarize light that travels through them. Stokes parameters The coherency matrix is not easy to visualize, and it is therefore common to describe incoherent or partially polarized radiation in terms of its total intensity ( I ), (fractional) degree of polarization ( p ), and the shape parameters of the polarization ellipse.
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