Could dark energy be used as an antigravity device?

[iced199]

If you were to concentrate enough of it in one place, could it generate an antigravity field, similar to the hypothetical 'negative matter'? Only it is proven to exist. I am wondering this because it obviously seems to have some kind of repulsive effect that is exactly the opposite of gravity. Though it may not be feasible, could it work?

 

[Pengwuino]

We don't even know what dark energy is definitively so whether or not you can do something with it is a moot point. Our best understanding of dark energy is that it is a property of space (space-time) itself, so to say that you can get some dark energy and "put it" some place doesn't make much sense.