A great variety of coatings fall into the "beam splitter" category. In
general, whenever both the reflected and transmitted light are controlled,
the coating is called a beamsplitter. Quite often, the coating must operate
at angles other than normal incidence. The design is more difficult when the
polarization of the reflected and/or transmitted light must be controlled.
Even more difficult are designs that seek to control the phase change of
the reflected or transmitted light. Another factor is the width of the
spectrum over which the coating is to operate.
The graphic below shows the performance of a 40-layer polarizing beamsplitter which performs quite well from 525 to 565 nm. Note that the S polarization is very close to zero in the entire 500-600 nm region. This non-traditional design was created with the needle optimization method.
Here are more examples of beamsplitters:
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