Optometrics Manufactures Wire Grid Polarizers Using Two Methods:
A wire grid polarizer transmits radiation when the “E” vector is perpendicular to the wire (E ┴). Radiation with the “E” vector parallel to the wire (E II) is reflected. Due to surface reflections, the reflected beam contains both polarizations.
The extinction ratio of a polarizer is a measure of its ability to attenuate a plane polarized beam. Two principle transmissions are necessary to calculate an extinction ratio, T_{1} and T_{2}. Assuming a perfectly plane polarized beam, T_{1} is defined as the maximum transmission for which the polarizer can be oriented. Minimum transmission (T_{2}) is the transmission through the polarizer when it is rotated 90 degrees from T_{1}. The extinction ratio is given as E = T_{2}/T_{1} and expressed as a decimal or percentage. The inverse of E, expressed as a ratio (R = 100: 1), is used in our specifications. A wire grid polarizer can also be characterized by the degree of polarization, defined as P = (T_{1} - T_{2})/(T_{1} + T_{2}).
Extinction ratios greater than 40,000:1 can be achieved by the use of two wire grid polarizers in series with their grids parallel (the overall extinction ratio is the product of the extinction ratio of the individual polarizers).
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