I had an idea for producing thrust from zero point energy. Hopefully you are familiar with the Casimir effect. You place to parallel plates very close to each other:

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You get a net attractive force between the plates because wavelengths of virtual energy that are longer than the spacing of the plates are absent between then but present outside and thus push the plates together. The shorter the distance between the plates, the more wavelengths are excluded and the stronger the force pushing them together.

Let’s suppose instead you don’t make the plates parallel:

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This would make more force pressing on the plates where they are close together than where they are farther apart. Given that the force is applied at an angle relative to the plates, shouldn’t that make them then want to move in a net direction away from the point where they are closest together?

I’m wondering if you etched a bunch of these very tiny structures (since most energy is contained in the smallest wavelengths) into a chip if you could get a measurable thrust?