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O: Fachverband Oberflächenphysik
O 87: Mini-Symposium: Infrared nano-optics I
O 87.4: Talk
Thursday, March 4, 2021, 12:00–12:15, R2
Amplitude- and phase-resolved infrared nanoimaging and nanospectroscopy of polaritons in liquid environment — •Divya Virmani1, Andrei Bylinkin1, Irene Dolado1, Eli Janzen2, James H. Edgar2, and Rainer Hillenbrand3,4 — 1CIC nanoGUNE BRTA, Donostia, Spain. — 2Kansas State University, Tim Taylor Department of Chemical Engineering, Durland Hall, Manhattan,USA — 3CIC nanoGUNE BRTA and Department of Electricity and Electronics, UPV/EHU, Donostia, Spain. — 4IKERBASQUE, Basque Foundation for Science, Bilbao, Spain.
Polaritons are well known for their ability to focus light to deep subwavelength sized spot allowing for highly sensitive analysis of bio(chemical) substances and processes. Nanoimaging of the polaritons evanescent fields is critically important for experimental mode identification and field confinement studies. In this work, we describe two setups for scattering-type scanning near-field optical microscopy (s-SNOM) based polariton nanoimaging and spectroscopy in liquid. We first demonstrate the mapping of near-field distribution of plasmonic metal antennas in liquid with a normal-incidence mid-infrared s-SNOM setup. We then demonstrate our total internal reflection (TIR) setup for infrared nanoimaging and nanospectroscopy of ultra-confined propagating phonon polaritons (PhPs) on h-BN flakes. Our work lays the foundation for s-SNOM based polariton interferometry in liquid for future exploitation, for example, in-situ studies of strong coupling between polaritons and molecular vibrations or chemical reactions at the bare or functionalized surfaces of polaritonic materials.