Plasmonic wavelength-dependent optical switch

Deirdre Kilbane, Eva Prinz, Tobias Eul, Michael Hartelt, Anna Katharina Mahro, Matthias Hensen, Walter Pfeiffer, Martin Aeschlimann

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We design and experimentally demonstrate an optical switch based on the interference of plasmonic modes in whispering gallery mode (WGM) antennas. Simultaneous excitation of even and odd WGM modes, enabled by a small symmetry breaking via non-normal illumination, allows switching the plasmonic near field between opposite sides of the antenna, depending on the excitation wavelength used in a wavelength range of 60 nm centered around 790 nm. This proposed switching mechanism is experimentally demonstrated by combining photoemission electron microscopy (PEEM) with a tunable wavelength femtosecond laser source in the visible and infrared.

Original languageEnglish
Pages (from-to)9579-9590
Number of pages12
JournalOptics Express
Issue number6
Publication statusPublished - 28 Feb 2023


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