Tuning the Effective PT Phase of Plasmonic Eigenmodes

in: Physical Review Letters (2019)
Wieduwilt, Torsten; Schmidt, Markus A.; Tuniz, Alessandro
We experimentally observe an effective PT -phase transition through the exceptional point in a hybrid plasmonic-dielectric waveguide system. Transmission experiments reveal fundamental changes in the underlying eigenmode interactions as the environmental refractive index is tuned, which can be unambiguously attributed to a crossing through the plasmonic exceptional point. These results extend the design opportunities for tunable non-Hermitian physics to plasmonic systems.

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