Propagation of surface plasmon polaritons on structures fabricated by application of focussed ion beam is investigated. Few types of structures were prepared on gold and aluminium thin films. Surface plasmon polaritons were locally excited and their transmition was studied. By focussed ion beam instrument were plasmonic resonant antennas created as well and resonance dependence on their geometry was investigated. Corresponding simulations by Finite-Dimension Time-Domain method were achieved.