I don't think the Casimir effect is utilizing some medium flowing between the plates. Its not about a quantum fluctuation freezing as it passes trough the passa

I don't think the Casimir effect is utilizing some medium flowing between the plates. Its not about a quantum fluctuation freezing as it passes trough the passage between the plates. Its rather that the quantum fluctuation comes into existence and disappears at random point in a vacuum, how often depends on the energy of the vacuum. When you put two plates really close together, there is not enough space for the quantum fluctuation to materialize, as it's wavelength is bigger than the gap. That way you limit the amount of those fluctuations materializing between the plates, and because there's less of them, there should be less energy than in unobstructed space, even vacuum. Thus negative energy, because its less than the 0 we assume for vacuum. Regarding working with time-interval, it might as well just be the opposite: minimize space-interval and maximize time-interval for maximum effect. It's just wild guesses at my side. But minimizing time-interval should be trivially doable by just slinging the plates past each other at high speed.