SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 69: Poster Session V: Poster to Mini-Symposium: Infrared nano-optics III
O 69.2: Poster
Mittwoch, 3. März 2021, 10:30–12:30, P
Infrared super-resolution microscopy of phonon polariton modes by sum-frequency generation — •Richarda Niemann1, Sören Wasserroth1, Guanyu Lu2, Christopher R. Gubbin3, Martin Wolf1, Simone De Liberato3, Joshua D. Caldwell2, and Alexander Paarmann1 — 1Fritz-Haber-Institut, Berlin, Germany — 2Vanderbilt University, Nashville, USA — 3University of Southhampton, Southhampton, UK
Nanophotonics is based on the subdiffractional localization of light by surface polariton modes. Its devices enable the modulation of light matter interaction on the nanometer scale by specifically designed subdiffractional nanostructures. Inherently, though, the spatial resolution for optical characterization of the polaritonic modes is limited by the diffraction limit. Here, we demonstrate a novel approach that overcomes this limitation by using Infrared-Visible Sum-Frequency Generation (IR-VIS-SFG) wide-field microscopy.
After the first SFG microscopy study of a nanophotonic system [1], we here demonstrate subdiffractional spatial resolution of <1 µm when imaging phonon polariton modes in SiC nano pillar structures at a wavelength of λ≈11 µm using the wide-field approach. The wide tunability of the infrared free-electron laser [2] used as the infrared light source enables full spectral mapping of the polaritonic modes in various simple subdiffractional structures, providing access to the polariton mode formation for the first time.
[1] Kiessling et al., ACS Photonics, (2019)
[2] Schöllkopf et al., Proc. of SPIE (2015)