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HL: Fachverband Halbleiterphysik

HL 26: Focussed Session: Frontiers in Exploring and Applying Plasmonic Systems II
(Joint Session of CPP, DS, HL, MM, and O, organized by DS)

HL 26.1: Vortrag

Montag, 20. März 2017, 16:30–16:45, CHE 89

Strong Coupling between Phonon-Polaritons and Plasmonic Nanorods — •Christian Huck¹, Jochen Vogt¹, Tomáš Neuman², Tadaaki Nagao³, Rainer Hillenbrand^4,5, Javier Aizpurua², Annemarie Pucci¹, and Frank Neubrech^1,6 — 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.