Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 77: Poster: Plasmonics and Nanooptics

O 77.10: Poster

Mittwoch, 14. März 2018, 18:15–20:30, Poster A

Ellipsometric investigation of the interaction of surface and localized plasmons and registration of their splitting — •Eugene Bortchagovsky — Institute of Semiconductor Physics of NAS of Ukraine, pr. Nauki 41, Kyiv 03028, Ukraine

Two interacting resonances can hybridize and split with energy gap between two hybridized dispersion curves instead of their intersection. We used ellipsometry to investigate the interaction of surface plasmon with localized resonances of nanoparticles deposited on the surface.

Ellipspmetric measurements were made as in the standard configuration with external reflection as in the Kretschmann geometry with internal reflection. Spherical gold particles from "Nanopartz" were deposited from solution on gold films with the thickness of about 40nm deposited on BK-7 slides. For measurements in Kretschmann geometry slides were attached to BK-7 rectangular prism by matching index liquid from "Cargil". Dispersion curves were restored from the position of dips in measured ellipsometric spectra of "psi" angle for the system with nanoparticles with the diameter of 50nm.

Presented results clearly demonstrate existence of few plasmon resonances localized on nanoparticles. The third resonance may be multipolar in addition to two (longitudinal and transverse) dipolar ones lifting of the degeneration of which is produced by the interaction with surface. All localized resonances hybridize with the surface plasmon producing splitting instead of the crossing of initial dispersion dependences. Parts of dispersion curves obtained at external and internal reflection join each other.