Near Infrared Polarizers.
DEPARTMENT OF THE NAVY WASHINGTON DC
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Construction of infrared polarizers with wire grids of better than 4300 lmm is accomplished by a four step process. The first step is to coat a layer of conductive material on a substrate. The substrate should have high transmission for the spectral region desired and the conductive coating should be highly conductive at that same spectral region. Next, a layer of photoresist is deposited over the conductive coating. The photoresist is then exposed in the third step to an interference pattern of two beams from a laser source which records a plane grating in the photoresist. The photoresist is then developed to produce a surface relief grating. The last step requires milling the surface relief grating with commercial ion milling techniques to reproduce the relief surface on the transparent conductive material. Author
- Lasers and Masers
- Infrared Detection and Detectors