Cathodoluminescence spectroscopy of plasmonic patch antennas: towards lower order and higher energies

Mathieu Jeannin (1) , Névine Rochat (2, 3) , Kuntheak Kheng (4) , Gilles Nogues (1)

1 NEEL - NPSC - Nanophysique et Semiconducteurs
2 UGA [2016-2019] - Université Grenoble Alpes [2016-2019]
3 CEA-LETI - Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information
4 NPSC - Nanophysique et Semiconducteurs

We report on the cathodoluminescence characterization of Au, Al and a Au/Al bimetal circular plasmonic patch antennas, with disk diameter ranging from 150 to 900 nm. It allows us access to monomode operation of the antennas down to the fundamental dipolar mode, in contrast to previous studies on similar systems. Moreover we show that we can can shift the operation range of the antennas towards the blue spectral range by using Al. Our experimental results are compared to a semi-analytical model that provides qualitative insight on the mode structure sustained by the antennas.

Mots clés: Cathodoluminescence; Plasmonics

Domaines: Optique [physics.optics]

Mathieu Jeannin, Névine Rochat, Kuntheak Kheng, Gilles Nogues. Cathodoluminescence spectroscopy of plasmonic patch antennas: towards lower order and higher energies. Optics Express, 2017, 25 (5), pp.5488. ⟨10.1364/OE.25.005488⟩. ⟨hal-01412585⟩