NIM inhomogenizes waves incident at an angle.

When a modulated wave (made of many frequencies) is incident at an angle to PIM NIM surface, the modulation (wide gray bands) and the carriers (sharp black-white narrow bands) go in entirely different directions.
Remember how they went in opposite directions (180 degrees) when the wave was incident perpendicular to surface? Well, here the angle between phase and group is between 90 and 180 degrees.
Note how the carriers go towards the PIM-NIM surface but not across it. The modulations cross the PIM-NIM surface from left to right, and keep going upwards, i.e., modulations refract at positive angles.
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