SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 69: Poster Session V: Poster to Mini-Symposium: Infrared nano-optics III
O 69.4: Poster
Mittwoch, 3. März 2021, 10:30–12:30, P
Spectrally resolved near-field response of mid-IR phonon-polariton antennas — •Andrea Mancini1, Christopher R. Gubbin2, Rodrigo Berté1, Francesco Martini2,3, Alberto Politi2, Emiliano Cortés1, Yi Li1,4, Simone De Liberato2, and Stefan A. Maier1,5 — 1Chair in Hybrid Nanosystems, Nanoinstitute Munich, LMU München, Germany — 2School of Physics and Astronomy, University of Southampton, United Kingdom — 3Istituto di Fotonica e Nanotecnologie - CNR, Via Cineto Romano, Italy — 4School of Microelectronics, Southern University of Science and Technology, Shenzhen, China — 5Department of Physics, Imperial College London, United Kingdom
As the optical behavior of metals approaches the one of perfect conductors at longer wavelengths, the efficiency of plasmonic antennas for light confinement is reduced in the infrared (IR) range. Efficient field confinement in the mid-IR, which can be particularly useful for ultra-sensitive and chemically-selective spectroscopy of molecular vibrations, can be achieved with antennas supporting localized surface phonon polaritons. Due to the presence of evanescent waves that do not propagate, far-field measurements cannot fully characterize the behavior of antennas in the near-field region. We employ scattering-scanning near field optical microscopy to unveil the spectral near-field response of 3C-SiC antenna arrays. We compare far-field and near-field spectra, and demonstrate the existence of a mode with no net dipole moment, absent in far-field spectra, but of importance for applications that exploit the heightened electromagnetic near fields.