Scientists confine light to space of 1 atom, make new record
Spain-based researchers have confined light down to less than a nanometer, a space one atom thick in dimension, the smallest confinement possible. The team squeezed plasmons, which are electrons interacting strongly with light, into a gap between metal and graphene, a 2D form of carbon. Further, the plasmon propagation could be switched on and off by applying an electrical voltage.