Mode Structure of Planar Optical Antennas on Dielectric Substrates
This research was supported by the US-DOE Office of Science (Office of Basic Energy Sciences) under Contract No. DE-FG02-07ER46406.
Photoemission, Electron microscopy, Microstrip antennas, Nanostructured materials
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.
Robert C. Word and Rolf Könenkamp, "Mode structure of planar optical antennas on dielectric substrates," Opt. Express 24, 18727-18738 (2016)