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DS: Fachverband Dünne Schichten
DS 15: Focussed Session: Frontiers in Exploring and Applying Plasmonic Systems I
(Joint Session of CPP, DS, HL, MM, and O, organized by DS)
DS 15.1: Talk
Monday, March 20, 2017, 16:30–16:45, CHE 89
Strong Coupling between Phonon-Polaritons and Plasmonic Nanorods — •Christian Huck1, Jochen Vogt1, Tomáš Neuman2, Tadaaki Nagao3, Rainer Hillenbrand4,5, Javier Aizpurua2, Annemarie Pucci1, and Frank Neubrech1,6 — 1Kirchhoff Institute for Physics, Heidelberg, Germany — 2Materials Physics Center (CSIC-UPV/EHU) and Donostia International Physics Center (DIPC), Donostia-San Sebastián, Spain — 3WPI Center for Materials NanoArchitectonics, National Institute for Materials Science, Tsukuba, Japan — 4CIC nanoGUNE and UPV/EHU, Donostia-San Sebastián, Spain — 5IKERBASQUE, Basque Foundation for Science, Bilbao, Spain — 64th Physics Institute, Stuttgart, Germany
We perform far-field spectroscopy of metal nanoantennas, resonant in the infrared spectral region, placed on silicon oxide (SiO2) layers of different thickness. Due to strong coupling between the plasmonic excitation of the metal antenna plasmons and the surface phonon-polaritons of thin SiO2 layers a splitting of the plasmonic resonance is found in the respective spectra. Although the phonon-polaritons themselves are dark excitations under normal illumination, they strongly interact with plasmon-polaritons as we detailed for a planar SiO2 layer beneath the nanostructures. The observed splitting can result in a transparency window, corresponding to suppression of antenna scattering, respectively “cloaking” of the antenna. The effect is a kind of induced transparency in which the strength of the phonon-polariton field plays the crucial role. It represents a further tuning possibility for the optical performance of infrared devices.