title: Mode structure of planar optical antennas on dielectric substrates.
abstract: We report a numerical study, supported by photoemission electron microscopy (PEEM), of sub-micron planar optical antennas on transparent substrate. We find these antennas generate intricate near-field spatial field distributions with odd and even numbers of nodes. We show that the field distributions are primarily superpositions of planar surface plasmon polariton modes confined to the metal/substrate interface. The mode structure provides opportunities for coherent switching and optical control in sub-micron volumes.
authors: Robert C
authors: RC
authors: Word
authors: Rolf
authors: R
authors: Könenkamp