I initially thought along the same lines, but not outdoors.
Depending on the energy consumption, this technology might serve as a nice protection inside buildings. Like areas where you don't want unauthorized personel to go to. For everyone else you could "lower the shield" for the moment of passing-through.
Depending on the energy consumption, this technology might serve as a nice protection inside buildings. Like areas where you don't want unauthorized personel to go to. For everyone else you could "lower the shield" for the moment of passing-through.