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I was using a program for simulating optical elements; mirrors, gratings, foils, crystals, slits, and zoneplates are what it mentioned. Does anyone know what a foil is in terms of optics? I know what aluminum foil is, obviously, but in terms of an optical system I don't know what a foil, or foil, would be, and what it's unique optical properties are.

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It's a black coating to stick on surfaces of devices of an optical setuo to reduce spurious reflections.

So it's very very black ("99,99%") on one side, and possibly sticky on the other side.

For an example, see Edmund Optics: Acktar Light Absorbent Foil

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