Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 37: Plasmonics and Nanooptics 1
O 37.6: Vortrag
Mittwoch, 7. September 2022, 12:00–12:15, H3
Long-wave infrared super-resolution wide-field microscopy using sum-frequency generation — •Richarda Niemann1, Sören Waßerroth1, Guanyu Lu2, Christopher R. Gubbin3, Simone De Liberato3, Joshua D. Caldwell2, Martin Wolf1, and Alexander Paarmann1 — 1Fritz Haber Institute of the Max Planck Society, Berlin, Germany — 2Vanderbilt University, Nashville, USA — 3University of Southampton, UK
We present our approach in infrared-visible (IR-VIS) sum-frequency generation (SFG) microscopy as a new tool for super-resolution imaging in the IR range.[1] Here, the imaging contrast in the microscope emerges from the IR resonances while the spatial resolution is provided by the SFG wavelength, i.e., well below the IR diffraction limit. As a proof of concept, we study localized phonon polaritons in sub-diffractional nanostructures made of Silicon Carbide.[2,3] A free electron laser as IR light source offers high-power laser pulses with tunable wavelengths.[4] We are able to resolve phonon polariton modes in individual sub-diffractional nanostructures and achieve a spatial resolution of ∼1.4 µm corresponding to λIR/9.[1] Full spectral mapping over the whole SiC Reststrahlenband allows the spectroscopic identification of the polariton resonances, while the high spatial resolution reveals the microscopic origin of the SFG emission.
[1] R. Niemann et al., Appl. Phys. Lett. 120, 131102 (2022)
[2] J.D. Caldwell et al., Nanophotonics 4, 1 (2015)
[3] I. Razdolski et al., Nano Letters 16, 6954 (2016)
[4] W. Schöllkopf et al., Proc SPIE 9512, 95121L (2015)