Looking for an old tv episode on syfy?

so the episode was about this weird dome things that appeared in the middle of the desert. and the military is brought in to investigate it but they can't seem to get in. This one guy actually falls in love with the girl on the other side and when they finally break through the force field he jumps in on time before it closes. When he's there he runs to her and then you find out she's a cannibal. I've been searching everywhere but i can't seem to find it. :( i Don't remember what the show was called either......